Backcountry Pilot • 1955 170B - What are must have mods ?

1955 170B - What are must have mods ?

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Re: 1955 170B - What are must have mods ?

People get hung up on having the latest, greatest, best!!! My first 400 hour of flying was with a Pacer and I flew all over Alaska with that plane. We had 170 Cessnas and several other low buck planes along. Yes a big motor 170 is great but for that money a 108/185 is better. Just fly what you have until you have been to every runway/gravel bar/hill top you can fit into. Once that is done upgrade. DENNY
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Re: 1955 170B - What are must have mods ?

Sounds like a good plan. As Mapleflight says, an O-360 does amazing things to these airplanes, but with a low time O-300, it’s be tough to justify, frankly.

BTW, the Bolen tailwheel attachment is very different from the 170. And the spring is wider on the Bolen. It’s an odd proprietary piece, actually.

The 170 tailwheel attach is stronger than the Bolen.

But the main (longest) spring leaf on the 170 is thin, and flexes more than is healthy.

The L-19 main leaf fits in the 170 stack, but is thicker, and a lot tougher. Pretty easy mod……find a mechanic who’s willing to call it a minor, or just do it. It’s not noticeable.

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Re: 1955 170B - What are must have mods ?

From a fellow 55 170b owner..who has done extensive modification and restoration..

1. If this is a new plane then the first order of business is to inspect every single last centimeter of the aircraft. Among other things, look at every nut, bolt, rivet, electrical wire, control cable, seat rail, cylinder bore, exhaust valve, brake lining and gear leg as if your life depends on it. If you are limited by knowledge or experience to assess these items, then research, study, and ask around until you you are no longer limited.

2. Replace, fix or address any critical issues that are discovered. Make note of issues that should be addressed in the future and when (This should be a pretty long list).

3. If you have any $$ left, then there are lots of awesome ways to spend it! Some good suggestions in the thread already.

The 170 doesn't really do any specific flight task all that well, but it does manage to be acceptably good at a significant number of them. If you want to start modifying, you really need to decide which direction you want to nudge the performance and experience. Cross country? Back country? Off airport? AK Bush? Load carrying? Sight seeing? Efficiency and cheap flying? Cabin comfort? Your choice will largely dictate how you navigate hundreds of variables. There can certainly be some overlap, but some are at opposite ends of the spectrum.

Arguably, the only things that would benefit you and the aircraft no matter how you want to fly it is the inertia real BAS seat belts, the vee brace, good lights, and lots and lots of flight hours. I think everything else depends on the mission.
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Re: 1955 170B - What are must have mods ?

I installed a Lycoming 0-360 A1D, fixed pitch it is lighter than the Conti 0-300. It's smaller dimensionally, two less jugs, shorter crankshaft, shorter camshaft etc. As I recall, without checking the specifications the difference is in the order of about 10-15 lbs.
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Re: 1955 170B - What are must have mods ?

Verticaltransit wrote:From a fellow 55 170b owner..who has done extensive modification and restoration..

1. If this is a new plane then the first order of business is to inspect every single last centimeter of the aircraft. Among other things, look at every nut, bolt, rivet, electrical wire, control cable, seat rail, cylinder bore, exhaust valve, brake lining and gear leg as if your life depends on it. If you are limited by knowledge or experience to assess these items, then research, study, and ask around until you you are no longer limited.

2. Replace, fix or address any critical issues that are discovered. Make note of issues that should be addressed in the future and when (This should be a pretty long list).

3. If you have any $$ left, then there are lots of awesome ways to spend it! Some good suggestions in the thread already.

The 170 doesn't really do any specific flight task all that well, but it does manage to be acceptably good at a significant number of them. If you want to start modifying, you really need to decide which direction you want to nudge the performance and experience. Cross country? Back country? Off airport? AK Bush? Load carrying? Sight seeing? Efficiency and cheap flying? Cabin comfort? Your choice will largely dictate how you navigate hundreds of variables. There can certainly be some overlap, but some are at opposite ends of the spectrum.

Arguably, the only things that would benefit you and the aircraft no matter how you want to fly it is the inertia real BAS seat belts, the vee brace, good lights, and lots and lots of flight hours. I think everything else depends on the mission.


Good advice there ^^^

I installed a v brace in my 170 after the first winter of ski flying. On floats or skis, a v-brace is a must do. And maybe for back country. If primarily pavement, not so much.

So, as he said, figure out your mission. Most of the mods I noted really aren’t mission specific, but mission will dictate the order you do things as well.
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Re: 1955 170B - What are must have mods ?

Does that still require the dimple/button mod on the cowling? What's the approval basis? Was that del-air, avcon or a 1-off field approval? 10 less lbs and more ponies is a great combo!

Mapleflt wrote:I installed a Lycoming 0-360 A1D, fixed pitch it is lighter than the Conti 0-300. It's smaller dimensionally, two less jugs, shorter crankshaft, shorter camshaft etc. As I recall, without checking the specifications the difference is in the order of about 10-15 lbs.
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Re: 1955 170B - What are must have mods ?

soyAnarchisto wrote:Does that still require the dimple/button mod on the cowling? What's the approval basis? Was that del-air, avcon or a 1-off field approval? 10 less lbs and more ponies is a great combo!

Mapleflt wrote:I installed a Lycoming 0-360 A1D, fixed pitch it is lighter than the Conti 0-300. It's smaller dimensionally, two less jugs, shorter crankshaft, shorter camshaft etc. As I recall, without checking the specifications the difference is in the order of about 10-15 lbs.


The Lycoming O and IO 360s are wider than either the O-320 Lycoming or the original Continentals. So, yes, the cowling has to be modified to accomodate the bigger Lycomings. Now, go to a Continental IO-360, and it fits the cowling without the bumps. And, 210 hp....

The problem with adding more power, but staying with the fixed pitch prop is that you'll never actually be able to use ALL that additional power. Why? Because, with a fixed pitch prop, you'll never (legally) be able to use maximum rpm. Those installations specify maximum static rpm, which for an O-360 is around 2300 rpm. Granted, once rolling, the engine will make a little higher rpm, but it will never get to 2700, which is the rpm at which that engine makes 180 hp.

In addition, you are stuck with one blade pitch, which means on floats, you need a fairly flat pitch for takeoff performance, but that means your cruise speed will be "leisurely" at best.

Add a constant speed prop, and now you can actually USE all 180 hp, and you can cruise at a much higher speed.

Mapleflt has already noted that for him, cruise speed isn't much of an issue in his mission, and the engine performance meets his needs. So, the lighter weight and lower cost of the fixed pitch prop makes sense. But, he's not getting a full 180 hp out of that engine. Then again, the O-300 wasn't actually making 145 hp either.

When you modify one of these airplanes with a larger engine, it can be a very serious money pit. An appropriate constant speed prop is going to cost north of $10K in many cases. Unless you go with a composite prop, the weight is very high. I replaced a Hartzell 80 inch prop with a MT composite prop and removed almost 30 pounds from the nose. Granted, that reduction also involved removal of a harmonic damper required by the Hartzell, at almost ten pounds. A fixed pitch is still lighter than a composite CS prop, but not that much.

And, those constant speed props PULL!

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Re: 1955 170B - What are must have mods ?

All that MTV points out is valid. The Canadian regulations offer an Owner Maintenance C of A classification but with restrictions, one being the prop it has to be fixed pitch. As for fitting the Lycoming under the hood a very talented local sheet metal craftsman was able to work his magic with a planishing hammer to "create" the required space, so I was able to forgo the typical blisters. See photo attached

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Re: 1955 170B - What are must have mods ?

The one mod you absolutely MUST HAVE is inertial reel shoulder harnesses. I won't get in an airplane without shoulder harnesses. And if you want to reach the flap handle with regular shoulder harnesses you'll have to loosen them. Then you won't retighten them so they won't really restrain you in case of a mishap. Spend the money on inertial reel shoulder harnesses!
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Re: 1955 170B - What are must have mods ?

mtv wrote:
Verticaltransit wrote:From a fellow 55 170b owner..who has done extensive modification and restoration..

1. If this is a new plane then the first order of business is to inspect every single last centimeter of the aircraft. Among other things, look at every nut, bolt, rivet, electrical wire, control cable, seat rail, cylinder bore, exhaust valve, brake lining and gear leg as if your life depends on it. If you are limited by knowledge or experience to assess these items, then research, study, and ask around until you you are no longer limited.

2. Replace, fix or address any critical issues that are discovered. Make note of issues that should be addressed in the future and when (This should be a pretty long list).

3. If you have any $$ left, then there are lots of awesome ways to spend it! Some good suggestions in the thread already.

The 170 doesn't really do any specific flight task all that well, but it does manage to be acceptably good at a significant number of them. If you want to start modifying, you really need to decide which direction you want to nudge the performance and experience. Cross country? Back country? Off airport? AK Bush? Load carrying? Sight seeing? Efficiency and cheap flying? Cabin comfort? Your choice will largely dictate how you navigate hundreds of variables. There can certainly be some overlap, but some are at opposite ends of the spectrum.

Arguably, the only things that would benefit you and the aircraft no matter how you want to fly it is the inertia real BAS seat belts, the vee brace, good lights, and lots and lots of flight hours. I think everything else depends on the mission.


Good advice there ^^^

I installed a v brace in my 170 after the first winter of ski flying. On floats or skis, a v-brace is a must do. And maybe for back country. If primarily pavement, not so much.

So, as he said, figure out your mission. Most of the mods I noted really aren’t mission specific, but mission will dictate the order you do things as well.
MTV


Definitely great advice. The airplane had a thorough prebuy and is going into the shop with her IA for the BAS safety belts and pull handles relatively soon. It will get another IA's eyes on it for sure. Sonia (owner) is going through the airplane on a cleaning up expedition and is examining every rivet and screw.

We did some training today. Lap belts only - feels like flying naked. Maybe a little risky - but hard not to fly it and on a calm wind day at KTTD. If you know the area then you know that wind and super windy is the norm. Day 1 of her TW training and she did great !

Here is a photo of the interior/panel.

Image


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Re: 1955 170B - What are must have mods ?

That's very nice. =D>
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Re: 1955 170B - What are must have mods ?

Wow! That thing is a cream puff!

Good for her.

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Re: 1955 170B - What are must have mods ?

Any chance of a better picture or two on how the Garmin is mounted within the yoke, it looks slick.
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Re: 1955 170B - What are must have mods ?

I will stick my neck on the line and join the others who have eluded to the following:

Until you can land this aeroplane every time you try on a pre determined spot on a short narrow strip in a gusty crosswind on a crappy day, there is no mod listed here that will improve your flying or the aeroplane. Nada, none, not even the inertia reel seatbelts although they are perhaps a sensible thing if you go off airport.

I would go even further and state that Cessna built a great wing that is hard to improve on. Sure, a Sportsman Cuff (which I have never tried) may may improve things, but it's a very mission specific mod as others have already said. I have flown a few modified Cessna wings and none have been as good as the original for most missions.

Put your money into fuel and experience!
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Re: 1955 170B - What are must have mods ?

“inertia reel seatbelts although they are perhaps a sensible thing if you go off airport.” End quote


They are sensible or dare I say a must for ALL operations not just off airport.

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Last edited by G44 on Thu Sep 29, 2022 7:24 am, edited 2 times in total.
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Re: 1955 170B - What are must have mods ?

Kurt +1
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Re: 1955 170B - What are must have mods ?

aussie bob wrote:I will stick my neck on the line and join the others who have eluded to the following:

Until you can land this aeroplane every time you try on a pre determined spot on a short narrow strip in a gusty crosswind on a crappy day, there is no mod listed here that will improve your flying or the aeroplane. Nada, none, not even the inertia reel seatbelts although they are perhaps a sensible thing if you go off airport.

I would go even further and state that Cessna built a great wing that is hard to improve on. Sure, a Sportsman Cuff (which I have never tried) may may improve things, but it's a very mission specific mod as others have already said. I have flown a few modified Cessna wings and none have been as good as the original for most missions.

Put your money into fuel and experience!


I certainly cannot argue the value of practice and familiarity with the airplane.

But to dismiss purely safety items, like the BAS harness and tail pull handles is just wrong. Even in carefully controlled practice, things can go sideways, and that harness system WILL save your life…..it saved mine. The tail pull handles offer a different place to push, pull and shove than that somewhat frail horizontal stabilizer, the likes of which have been damaged by pushers and solvers. That thing fails, you’re looking at huge money.

Tailwheel mods, likewise are a safety matter. During practice, if that tailspring fails….you may have the opportunity to try out that BAS harness, or the seatbelts if you opted out of the harness.

Tailwheels are THE most abused part of these aircraft….it’s just a tough place to work, and frankly, most owners ignore them. Hence the need on a newly acquired plane to ensure that tailwheel is up to the intended task of getting competent in the plane, which requires a LOT of exercise of that tailwheel.

Now, the Sportsman cuff….it’s also a safety device. If you can consistently land your plane slower, with better control at those slow speeds, your practice program just got significantly safer. And, not having flown a Sportsman equipped wing, I would argue that you are not well qualified to discount that kits effect on a Cessna wing. The Sportsman cuff is nothing like the other cuffs out there: Bush, etc. the difference is significant, believe me.

So, my point is, these mods make the airplane both safer and more functionally durable. And, if the goal is proficiency, as you noted and I agree with, safety and function should be VERY high on anyones list.

MTV
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Re: 1955 170B - What are must have mods ?

mtv wrote:
aussie bob wrote:I will stick my neck on the line and join the others who have eluded to the following:

Until you can land this aeroplane every time you try on a pre determined spot on a short narrow strip in a gusty crosswind on a crappy day, there is no mod listed here that will improve your flying or the aeroplane. Nada, none, not even the inertia reel seatbelts although they are perhaps a sensible thing if you go off airport.

I would go even further and state that Cessna built a great wing that is hard to improve on. Sure, a Sportsman Cuff (which I have never tried) may may improve things, but it's a very mission specific mod as others have already said. I have flown a few modified Cessna wings and none have been as good as the original for most missions.

Put your money into fuel and experience!


I certainly cannot argue the value of practice and familiarity with the airplane.

Now, the Sportsman cuff….it’s also a safety device. If you can consistently land your plane slower, with better control at those slow speeds, your practice program just got significantly safer. And, not having flown a Sportsman equipped wing, I would argue that you are not well qualified to discount that kits effect on a Cessna wing. The Sportsman cuff is nothing like the other cuffs out there: Bush, etc. the difference is significant, believe me.

So, my point is, these mods make the airplane both safer and more functionally durable. And, if the goal is proficiency, as you noted and I agree with, safety and function should be VERY high on anyones list.

MTV



I think you are both right on the Sportsmans. I have 400 or so hours on a 170b wing before I put the kit on. Does the it add some measurable benefit in controllability at low speeds? Yes. Does that mean that it has the possibility of adding a safety factor in certain scenarios. Sure. For example, a slight glide ratio improvement in an engine out scenario could be considered a safety benefit.

However, like every other aircraft out there, the 170 and its airfoil have limits. Being a pilot is about learning, and respecting those limits for all your operations, at all times without exception. The cuff might expand those limits slightly, but it doesn't mean a damn thing if the pilot isn't skilled enough to consciously and consistently stay inside the limits in the first place.

If you are just going airport to airport, and don't need to be finessing your 170 on a 35mph final approach, then you're not really using much of the benefit of the cuff. If you are are making mistakes like a moose stall then the issue isn't the wing, and it's lack of a mod.

That said.. I really like my Sportsmans kit, but I'm also glad I spent hundreds of hours learning the wing before I installed it. That time is 1000% the best safety "mod" you can do.

Probably splitting some hairs here though.
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Re: 1955 170B - What are must have mods ?

mtv wrote:
aussie bob wrote:I will stick my neck on the line and join the others who have eluded to the following:

Until you can land this aeroplane every time you try on a pre determined spot on a short narrow strip in a gusty crosswind on a crappy day, there is no mod listed here that will improve your flying or the aeroplane. Nada, none, not even the inertia reel seatbelts although they are perhaps a sensible thing if you go off airport.

I would go even further and state that Cessna built a great wing that is hard to improve on. Sure, a Sportsman Cuff (which I have never tried) may may improve things, but it's a very mission specific mod as others have already said. I have flown a few modified Cessna wings and none have been as good as the original for most missions.




I certainly cannot argue the value of practice and familiarity with the airplane.

But to dismiss purely safety items, like the BAS harness and tail pull handles is just wrong. Even in carefully controlled practice, things can go sideways, and that harness system WILL save your life…..it saved mine. The tail pull handles offer a different place to push, pull and shove than that somewhat frail horizontal stabilizer, the likes of which have been damaged by pushers and solvers. That thing fails, you’re looking at huge money.

Tailwheel mods, likewise are a safety matter. During practice, if that tailspring fails….you may have the opportunity to try out that BAS harness, or the seatbelts if you opted out of the harness.

Tailwheels are THE most abused part of these aircraft….it’s just a tough place to work, and frankly, most owners ignore them. Hence the need on a newly acquired plane to ensure that tailwheel is up to the intended task of getting competent in the plane, which requires a LOT of exercise of that tailwheel.

Now, the Sportsman cuff….it’s also a safety device. If you can consistently land your plane slower, with better control at those slow speeds, your practice program just got significantly safer. And, not having flown a Sportsman equipped wing, I would argue that you are not well qualified to discount that kits effect on a Cessna wing. The Sportsman cuff is nothing like the other cuffs out there: Bush, etc. the difference is significant, believe me.

So, my point is, these mods make the airplane both safer and more functionally durable. And, if the goal is proficiency, as you noted and I agree with, safety and function should be VERY high on anyones list.

MTV


^^^^^
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Re: 1955 170B - What are must have mods ?

Mapleflt wrote:Any chance of a better picture or two on how the Garmin is mounted within the yoke, it looks slick.


Mapleleaf,


Took these photos today. Hope this gives you a good enough idea regarding the setup. Cable comes from behind the left panel. I didn't check to see if it had its own circuit breaker. I will look tomorrow.

Image

Image

Pretty fun day training. I feel like the 170 flies so lightly compared with a 180/185. More like the 120/140 than the 180/185. I actually flew my plane for a test flight after its annual today in between some training in the 170. It felt like a heavy truck after flying its little brother the last week.


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