Did weight and balance on Cessna 170B over last weekend . Need someone who has Cessna 170b to look up there equipment list or weight and balance report (with stations ) of mains and tail wheel locations . This will be like 17 for mains and approx 213 for tw. Send this to me at my email [email protected] please - thanks Bill Reid

Or, by posting the info here, the answer will be waiting for the next person with this question.

Be advised that not all 170's are the same. I measured the arms when I did the W&B on my old ragwing 170 some years back and was glad I did, because the factory W&B sheet numbers were not correct. Mine had C180 gear legs which swept forward more than the stock legs, plus a 3200 tailwheel which puts the wheel on the ground farther aft than the smaller Scott t/w which was standard equipment. FWIW I still have that info: the mains were at 18.5" (stock was 22"), tailwheel was at 249.5" (stock was 249). With oil but no fuel, mine weighed in at 1318 with the CG at 38.65". I wrote up a little article about doing my W&B which was published in the Q2/2003 170 News - I kept a copy of the article which is why I still have the data.
My current airplane (C150TD) was weighed & a new W&B sheet prepared by the IA who rebuilt it from a wreck before I bought it. When I did some "improvements" (mainly removing stuff), I had access to a good set of scales so I reweighed it and measured the arms just to be sure. Glad I did, he had the mains right but mismeasured the t/w arm -- probably by "burning an inch" on his tape measure.
In my experience, the W&B sheet is one of the things about airplane paperwork that is most likely to be fudged or just plain-ass wrong. For example, I've seen Pacer W&B sheets where someone used the firewall for a datum instead of the wing leading edge -- that sure played hell with the W&B calcs!

Zzz wrote:Or, by posting the info here, the answer will be waiting for the next person with this question.

Yes either is fine - just need the locations in relationship to datum > firewall . Station s are in inches forward (-)or aft ( +) of firewall in Cessna single engine aircraft . Since I use scale plates I use the number x inches to get moment . I have a computer program that does the computations after that.
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[quote="182 STOL driver"]Did weight and balance on Cessna 170B over last weekend . Need someone who has Cessna 170b to look up there equipment list or weight and balance report (with stations ) of mains and tail wheel locations . This will be like 17 for mains and approx 213 for tw. Send this to me at my email [email protected] please - thanks Bill Reid[/quote]

Why do you want somebody else's ? Are you comparing?

hotrod150 wrote:Be advised that not all 170's are the same. I measured the arms when I did the W&B on my old ragwing 170 some years back and was glad I did, because the factory W&B sheet numbers were not correct. Mine had C180 gear legs which swept forward more than the stock legs, plus a 3200 tailwheel which puts the wheel on the ground farther aft than the smaller Scott t/w which was standard equipment. FWIW I still have that info: the mains were at 18.5" (stock was 22"), tailwheel was at 249.5" (stock was 249).

Hotrod's numbers are pretty much what is stated in the TCDS: http://cessna170.backcountrypilot.org/w ... /A-799.pdf

+22" for wheels
+249" for Scott 3200

A&P IA's out there, the TCDS is the authority for W&B stations, correct?

That TCDS doesn't necesarily mean anything, the actual locations on the airplane in question are what count. Physically measure them. Altered/different gear legs, shortened tailsprings, alternate tailwheel assemblies...like my example, the real-life stations might not be the same as what's shown on the TCDS.

Bill,

My '52 170b is in annual right now. I'll head down to the airport and see what the stations are on it. I do have the 180 gear legs and the scott 3200. It will be interesting to see how the actual stations compare with the type certificate.

There's two different C180 gear leg configurations, I had the later ones which are 3-1/2" farther forward than the stock 170 legs. The early C180 legs (1953-54) are not swept as far forward, I believe those are only about 1/2" farther forward. There were two or maybe three different 170 gear legs, but I think they all had the same rake.

hotrod150 wrote:There's two different C180 gear leg configurations, I had the later ones which are 3-1/2" farther forward than the stock 170 legs. The early C180 legs (1953-54) are not swept as far forward, I believe those are only about 1/2" farther forward. There were two or maybe three different 170 gear legs, but I think they all had the same rake.

I think they changed the sweep on one of the 170 legs... That's why the early 170 legs are left/right swap-able but the later ones are not???

Zzz wrote:
A&P IA's out there, the TCDS is the authority for W&B stations, correct?

It's good practice to use the individual planes stations. I would never do a W&B from manufacturers stations for all the above reasons. Takes no time at all to drop a plumb bob from the datum (or elsewhere if datum is forward of the spinner) and the weighing points and actually measure it

EZFlap wrote:

hotrod150 wrote:There's two different C180 gear leg configurations, I had the later ones which are 3-1/2" farther forward than the stock 170 legs. The early C180 legs (1953-54) are not swept as far forward, I believe those are only about 1/2" farther forward. There were two or maybe three different 170 gear legs, but I think they all had the same rake.

I think they changed the sweep on one of the 170 legs... That's why the early 170 legs are left/right swap-able but the later ones are not???

I think the sweep (or "rake") of the various 170 legs is the same, as the TCDS shows only one arm for the mains-- the right/left thing is because they are not symetrical. I believe there were three different gear legs- the early soft gear (1948-49?), the later heavier gear (1950-53?) , and the "lady legs" (1954-55?). I think the lady legs are the ones that are left/right specific.

Also remember that the weights are only accurate if upper door frame is level.

Zzz wrote:Also remember that the weights are only accurate if upper door frame is level.

Got stations sorted out thanks - the stations for wheels is not on type data sheets - except for the fuel. There is a "range " for what center of gravity at different weights. Yes the top of the door frame is level point as is seat tracks side to side.

182 STOL driver wrote:Got stations sorted out thanks - the stations for wheels is not on type data sheets - except for the fuel.

They are listed, as I read it.

TCDS A799 wrote:Landing Gear
201. 2 Main wheel-brake assemblies, 6.00-6, Type III

(a) Goodyear Model LF6HBD 13 lb. (+22) (+22) (+22)
Wheel Assembly No. 511960-M
Brake Assembly No. 9521239
(b) Goodyear Model CL6HBM 30 lb. (+22) (+22) (+22)


204. Tail wheel assembly

(a) Scott Model 3-24B, steerable 5 lb. (+246) (+246) (+246)
*(b) Scott Model 3200, steerable, swiveling 8 lb. (+249) (+249) (+249)
installed in accordance with Scott Bulletin I-168)
*(c) Maule SFS-1-2-P8 6 lb. (+246) (+246) (+246)

The Goodyear is listed as an approved wheel/brake assembly, but every component for wheel landing gear is listed at 22" aft of datum.