Backcountry Pilot • Whee's Bearhawk Project...Airworthiness Certificate issued!

Whee's Bearhawk Project...Airworthiness Certificate issued!

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Re: Whee's Bearhawk Project...progress.

I'll keep posting. Thanks guys!

Not a lot to show but...

Rear doors welded and hinged.
ImageUntitled by Jon Whee, on Flickr

ImageUntitled by Jon Whee, on Flickr

Started laying out the L-track which the rear seats will mount to. I'm really excited about this and think it will work awesome.
ImageUntitled by Jon Whee, on Flickr

Left side rear window frame tack welded in place. Yep, that's not the normal rear window.
ImageUntitled by Jon Whee, on Flickr
whee offline
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Re: Whee's Bearhawk Project...progress.

whee wrote:I'll keep posting. Thanks guys!

Not a lot to show but...

Rear doors welded and hinged.
ImageUntitled by Jon Whee, on Flickr

ImageUntitled by Jon Whee, on Flickr

Started laying out the L-track which the rear seats will mount to. I'm really excited about this and think it will work awesome.
ImageUntitled by Jon Whee, on Flickr

Left side rear window frame tack welded in place. Yep, that's not the normal rear window.
ImageUntitled by Jon Whee, on Flickr


Looking good Jon!

I can tell the rear window is different, but cant visualize it. What is different, and why?
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Re: Whee's Bearhawk Project...progress.

Is it going to be like a patroller style (Maule)?
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Re: Whee's Bearhawk Project...progress.

Typical rear window.
Image

Maule Patroller rear window.
Image

My windows will be similar to the Maule Patroller but the bottom of my window will follow the angled tube you can see in the Maule window. I'm doing this because I think it will make it more enjoyable for my family to have a great view while flying.
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Re: Whee's Bearhawk Project...progress.

whee wrote:My windows will be similar to the Maule Patroller but the bottom of my window will follow the angled tube you can see in the Maule window. I'm doing this because I think it will make it more enjoyable for my family to have a great view while flying.


That's a great idea!

I had a pair of my young nephews in the plane a week or so ago for a few hours. Every time I looked back and they were awake they were both staring out the windows. The more glass the better!
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Re: Whee's Bearhawk Project...progress.

John...

I like that window idea.... Looks a lot like the ones Darin put in his Stretched Pacer..

Image

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Re: Whee's Bearhawk Project...progress.

Yep as I start saving idea's for my eventual bearhawk build, this is on my list of customizations. Another picture here with Jared's bearhawk:

Image

Whee I like that you are following that bottom cross bar up as the bottom of the window, I think it makes a better looking line, but still gives more visibility to your passengers, if you go below that and just square if off... I think it looks a little boxy (sorry Jared, just my 0.02, you have a flying bird and all I have is a set of plans gathering dust so who am I to say)
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Re: Whee's Bearhawk Project...progress.

whee wrote:
Started laying out the L-track which the rear seats will mount to. I'm really excited about this and think it will work awesome.
ImageUntitled by Jon Whee, on Flickr



Interesting... Was the idea behind taking the track all the way to the rear baggage wall/braces that you could put in a 3rd row seat?
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Re: Whee's Bearhawk Project...progress.

Yes, I have three kids so I need a 3rd row.
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Re: Whee's Bearhawk Project...progress.

Now you need to bubble out that window a couple inches...it'll make it stronger, but even better visibility!
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Re: Whee's Bearhawk Project...progress.

Jeredp wrote:
whee wrote:Yes, I have three kids so I need a 3rd row.


I admire your "keep after it efforts" with having three kids! I can't imagine taking on a project like this with my two kids! They won't fully appreciate your efforts till later in life but I have no doubt that they will remember their airplane experiences with dad for the rest of their life. My boys still think riding in the airplane is just like riding in the truck. Everytime they tell someone new about their flying adventures, they get some strange looks :D
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Re: Whee's Bearhawk Project...progress.

I don't know if the BH people have addressed this, or if they do not feel that is an issue but, If the hawk is loaded up with some weight, the pax and baggage doors can be difficult to latch. This is due to flexing of the air frame causing door latches being displaced out of alignment.
It is understandable why this is happening. The void of structure that makes up the large rear door, lacks the bracing that controls the sheer forces in the airframe on the starboard side.
Personally I would consider a structural modification this area to mitigate this deflection while in precover stage. Initially, I would suspect that upper structure above the door is to blame, considering that this area is in compression, even though it looks rather substantive. But a look at the lower frame, shows that the door frame tapers, or structurally converges into the lower longeron. I ain't an engineer, but something tells me this is where the problem lies.
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Re: Whee's Bearhawk Project...progress.

hardtailjohn wrote:Now you need to bubble out that window a couple inches...it'll make it stronger, but even better visibility!

That's a good idea. Only thing is I'm hoping to squeeze some reasonable speed out of this thing and I don't know how much bubble windows will slow it down. Probly not much.

Jeredp wrote:I admire your "keep after it efforts" with having three kids! I can't imagine taking on a project like this with my two kids! They won't fully appreciate your efforts till later in life but I have no doubt that they will remember their airplane experiences with dad for the rest of their life. My boys still think riding in the airplane is just like riding in the truck. Everytime they tell someone new about their flying adventures, they get some strange looks :D

I gets really hard some times but I think it will be worth it.

Sidewinder wrote:I don't know if the BH people have addressed this, or if they do not feel that is an issue but, If the hawk is loaded up with some weight, the pax and baggage doors can be difficult to latch. This is due to flexing of the air frame causing door latches being displaced out of alignment.
It is understandable why this is happening. The void of structure that makes up the large rear door, lacks the bracing that controls the sheer forces in the airframe on the starboard side.
Personally I would consider a structural modification this area to mitigate this deflection while in precover stage. Initially, I would suspect that upper structure above the door is to blame, considering that this area is in compression, even though it looks rather substantive. But a look at the lower frame, shows that the door frame tapers, or structurally converges into the lower longeron. I ain't an engineer, but something tells me this is where the problem lies.

I have experienced the BH airframe flexing first hand and it is something I hope I have solved. Bob wasn't concerned about it when I asked him , even the kitset airframes flex and I don't think they have any plans to address it. Nothing plastically deforms so it isn't anything to get concerned about other than I found it annoying. The top of the door opening extends to the upper longeron and I think that is where the bending is taking place. There is a piece of 0.032 4130 steel bent into a "U" channel that squares off that upper corner of the door. On my airplane that "U" channel is replaced with a 3/4" x 0.035" tube and I think that will solve the problem. Before I cover the airplane I will load it up and see if the frame has flexed.
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Re: Whee's Bearhawk Project...progress.

Here's a Patrol in Alaska with similar window lines, sure has me thinking about that for my 4 place.
Image
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Re: Whee's Bearhawk Project...progress.

marcusofcotton wrote:Here's a Patrol in Alaska with similar window lines, sure has me thinking about that for my 4 place.
Image


That sure looks nice! I've been planing to do a similar paint scheme.

Just been doing more welding while my dad works on door parts. Nothing exciting but I don't want you guys to think I'm getting lazy.

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Re: Whee's Bearhawk Project...progress.

Nice picture of Ben's Patrol. Could you credit the photographer? ;)
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Re: Whee's Bearhawk Project...progress.

Bear_Builder wrote:Nice picture of Ben's Patrol. Could you credit the photographer? ;)

:oops: ah...ah...ah...sheesh, I had grabbed it to reply quickly as I was in a hurry, and now I can't even remember exactly where I lifted it from. :roll: Guessing it was you Phil? My apologies. Beautiful shot of a very nice aircraft.
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Re: Whee's Bearhawk Project...progress.

That L Track is a great idea, that looks pretty sweet!

The rear cargo door concerned us as well, mainly because its location places it over the rear float fitting station and we didn't want the door popping open on a hard landing. I believe this is similar to what the Maule has in its fuselage. A weight penalty, but solid insurance.

Image

Sorry for the marginal picture, but our 8 year project is slowly getting covered with fabric as we speak! :D

I too am building with my father, how's that going for you guys?
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Re: Whee's Bearhawk Project...progress.

HawkRT wrote:That L Track is a great idea, that looks pretty sweet!

The rear cargo door concerned us as well, mainly because its location places it over the rear float fitting station and we didn't want the door popping open on a hard landing. I believe this is similar to what the Maule has in its fuselage. A weight penalty, but solid insurance.

Image

Sorry for the marginal picture, but our 8 year project is slowly getting covered with fabric as we speak! :D

I too am building with my father, how's that going for you guys?


Thanks! I think the L-track is going to work really nice.

I thought about installing a steel plate like you did but we decided we didn't need it. How thick of plate did you use?

My dad and I have done a few fairly large projects together so we work well together. Now I'm older and a opinionated engineer but I can usually keep myself in check. When I can't I'm grateful for my dad's patience and his humility because he usually ends up being right. I really enjoy working with him.
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Re: Whee's Bearhawk Project...progress.

My hats off to you "full build" guys. I'd slit my wrists.
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