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Author Topic: Walt Mooney "Bostonian Beaver"  (Read 2703 times)
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Glenn (gravitywell) Reach
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« on: April 04, 2008, 03:24:47 PM »

Here is my new Bostonian Beaver. Its a Walt Mooney design. I built this plane many years ago..... back when computers were made of wood!! Grin Its an excellent little flier. I'm building it for the Bostonian cook-up that John has going on at his "Stick & Tissue" forum.
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« Reply #1 on: April 04, 2008, 03:53:47 PM »

You must have parked it in my blind spot Glenn, I'm having just a little trouble seeing it.
Doug
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Glenn (gravitywell) Reach
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« Reply #2 on: April 05, 2008, 12:58:21 AM »

Sorry about that guys..... talk about being excited to post something! Grin As you can see from the weight its going to be a bit of a little piggy Beaver! I only fly outdoors so that explains the extra "strengthening" weight.... yeah... thats it! Roll Eyes
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Dan G.
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« Reply #3 on: April 05, 2008, 01:23:34 AM »

I like the triangulation in the stab -- always a good idea there, I think.

Dan G.
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« Reply #4 on: April 05, 2008, 07:31:53 AM »

I like the triangulation in the stab -- always a good idea there, I think.

Dan, interesting comment there. I've built two Found 100's off Mooney's plans, and they had the same stab structure as this one. Believe it or not, they ended up being more prone to warping than a traditional structure! Go figure. Looks like fully geodetic construction is the only way to go on search of rigid structures.
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Glenn (gravitywell) Reach
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« Reply #5 on: April 05, 2008, 05:35:03 PM »

Now that you mentioned it.... the first one I built years ago, had a warped stab problem. I wonder why that is? You would think the kida geodetic would reduce this tendency.
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Dan G.
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« Reply #6 on: April 06, 2008, 02:13:21 AM »

Maybe "reduce this tendency" is all it can do -- not remove it entirely.

Shrinking tissue pulls really hard. Much of the light construction I build is limited by the fact that I'm covering with the same tissue, not because the flight or crash loads are too high. If you have a tendency to cover tightly, maybe on those thinner parts, you might limit the shrinkage either by doping without water shrinking, or using lite-shrink dope.

I did build a stab like that for an F-4U (out of that book) which lasted many years, plus I used a really thin T.E., so it can be done. Unfortunately, I don't remember how I treated its covering. Since then, I have had warping stabs and I ended up having to break and reset their edges, and of course, they never looked the same again. Probably, a less-than-tight stab is better than a warped one.

Dan G.
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Glenn (gravitywell) Reach
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« Reply #7 on: April 14, 2008, 09:43:44 PM »

Well the company has finally departed and the house is slowly returning to normal. A little covering work on the Beave.
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« Reply #8 on: July 03, 2008, 11:58:39 AM »

Grav, Think your airplane is great. It seems the Bostonians have a ton of character. Really like them. Just how do you build them so light Guys. Do you mould air for the structure?  Grin

Caley
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« Reply #9 on: October 03, 2010, 02:59:03 PM »

Reaching that time of year when indoor models start to appear on the board again Wink

Since I'm waiting for some tissue and stuff I thought I'd rummage through the part built box and came across a version of this which was crying out to be finished....

Made some wire bits, changed the hollowed block wingtips for thin sheet. Sheeted the nose and made up a new nose plug in which I fitted a KP adjustable nose bush... et voila! Cheesy

You'll notice I changed to straight ribs on the tailplane and I made the nose a bit bigger and higher so it looked a bit more Beaver like (IMO)

AUW is 6.98gms without the prop (that IGRA prop weighs in at a cool 3gms so I suspect a balsa one is on the cards)

I've sorted a cool colour scheme out for it which should appear later this week

Toodlepip
Paul
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scigs30
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« Reply #10 on: October 15, 2010, 01:11:06 AM »

My Uncle has the original build by Walt Mooney himself hanging in his room, I will take pictures and post it.
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« Reply #11 on: October 15, 2010, 04:55:41 AM »

Wow - look forward to that scigs Shocked

(tissue arrived so I am starting to cover her now)

Cheers
Paul
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« Reply #12 on: October 15, 2010, 01:22:08 PM »

I had the article and plan from MB in my mitts just a few day ago as I was cataloging my plans in electronic format (WORKS Database). The "Beaver" was on my build list for some time (along with... Roll Eyes). The diagonal stab "ribs" were intentional as an anti-warp feature. With "straight" ribs, make sure you pre-shrink or crumple to keep from potato chipping.

What kind of weights are you seeing (might build one yet)?
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« Reply #13 on: October 15, 2010, 02:17:16 PM »

Whenever I would build a light Bostonian, I would use Domestic Tissue to prevent it from crumbling. I think Walt used gray Peck Domestic tissue on his beaver....Or maybe it was blue Esaki that turned grey over time.  I am waiting for the weather to clear up today and I will fly my Walt Rearwin Speedster and take video I hope.
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« Reply #14 on: October 15, 2010, 06:41:07 PM »

Almost lost mine today, will post video of her flying away. I posted pictures in the flying forum.
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« Reply #15 on: October 16, 2010, 09:55:49 AM »

My uncle called me today and said I could have the Walt Mooney Plane. I don't really want to take it from him, but if that's what he wants I won't argue. I will take good care of it and take tons of pictures. Walt was a fascinating engineer that could design and build models faster than anyone I know. They were on the heavy side, I would call them Guillow designs, but they flew great. He had rooms full of built models and most Hobby Stores had is models hanging. When he passed away, my Uncle bought some of his models from a Hobby Store in El Cajon California. This was an awesome little hobby store that catered to freeflight and model rockets. It was a mom and pop store, but it is no longer there.
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« Reply #16 on: November 07, 2010, 06:24:44 PM »

Here is the original Beaver built by Walt.
http://www.hippocketaeronautics.com/hpa_forum/index.php?topic=4653.0
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« Reply #17 on: December 02, 2010, 05:28:51 AM »

Had a slight hiccup in the covering department :'(

Covered most of the airframe shiny side out using Esaki then started printing the other bits on my new printer only to discover that the ink was blurring Shocked

Eventually printed on the matte side and got enough bits, but it meant stripping off all the carefully applied tissue. I left it shiny side out on the nose because I was getting fed up with it (also looks more like metal panels?)

Anyways hopefully I'll get this finished eventually....

Paul
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« Reply #18 on: December 05, 2010, 09:55:21 AM »

Maybe "reduce this tendency" is all it can do -- not remove it entirely.

Shrinking tissue pulls really hard. Much of the light construction I build is limited by the fact that I'm covering with the same tissue, not because the flight or crash loads are too high. If you have a tendency to cover tightly, maybe on those thinner parts, you might limit the shrinkage either by doping without water shrinking, or using lite-shrink dope.

I did build a stab like that for an F-4U (out of that book) which lasted many years, plus I used a really thin T.E., so it can be done. Unfortunately, I don't remember how I treated its covering. Since then, I have had warping stabs and I ended up having to break and reset their edges, and of course, they never looked the same again. Probably, a less-than-tight stab is better than a warped one.

Has anyone tried preshrinking (using a frame)?

Also, crushing the paper (to "break the fibers)?
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« Reply #19 on: December 05, 2010, 12:46:08 PM »

I always pre-shrink my Esaki tissue in an old picture frame.
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« Reply #20 on: December 05, 2010, 07:00:04 PM »

I used crumpled Esaki on the tailplane of a Bll Brown "BugAmi". Looks like HE**, but hasn't shrunk or deformed the part yet (a year old now).
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« Reply #21 on: December 23, 2010, 01:26:03 PM »

Hiya folks

Merry Christmas one and all first off Cheesy

Finished the Bostonian Beaver off before embarking on something new. Here's some piccies.

CofG is a little further forward than the plan so a bit of lightening around the nose may be called for. Undecided I also made some changes to alter the look slightly.

Covering is Esaki with a single coat of thinned banana oil. Some markings are printed onto this, but the roundels are printed separately and stuck on afterward. A quick spray with white acrylic from a rattle can on the back of the tissue stopped them bleeding out. Wink

AUW is 15gms as shown and it is now sitting in it's box awaiting flight trials in the new year. Cool

Cheers for now
Paul
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« Reply #22 on: December 23, 2010, 04:10:05 PM »

Merry Christmas to you Paul.

The Beaver is looking very smart .... smart as that guy in the SMAE AGM photos in this month's BMFA News! Wink

15g is very good for a semi scale 'character' Bostonian - mine are normally up towards 20g for a similar subject. I look forward to hearing how it performs.
It would be great to see it 'in competition' at Impington.
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« Reply #23 on: December 23, 2010, 05:48:53 PM »

Paul, Walt added a shim under the rear of the stab to counter the excess nose weight.
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« Reply #24 on: December 24, 2010, 03:44:41 AM »

The Beaver is looking very smart .... smart as that guy in the SMAE AGM photos in this month's BMFA News! Wink
It would be great to see it 'in competition' at Impington.

Cheers Russ - Fame at last eh? Embarrassed

Impington's a long trip, but I may send some stuff to be proxy flown if Chris is okay with that .... Roll Eyes

Funny you should mention the shim Scigs30; although you may not be able to see it I wedged a piece under the tail after test gliding across the bed Wink

TTFN
Paul
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