Top Flite P47 - SCALE ELECTRIC BUILD - Page 7 - RC Groups
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Jan 08, 2009, 07:30 PM
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Gree's Avatar

Continuing the Wing Modifications

More Kit Bashing to get my 4" Wheels to Fit!
Been spending a lot of time for what seems like not much progress. However I have the landing gear mounted in its new more scale location, and have completed the mods to make this fit (on one side anyway!).

As you can see the main spar has been completely removed in the wheel well. When fitting the gear and twiddling it all around I left a very thin part of the rib in place so I could check the wheel wasn't going to stick out of the upper surface of the wing when retracted!

Tarting-up the Wheel Wells?
I plan on detailing the bay a bit (very semi-scale though), and found a sheet of styrene in a model shop that I thought could work well for the corrugation in the upper well. But bringing it home I see that there are too many ridges in the sheet. Maybe I will sand out every second one...

This sheet was to be laminated to the inner wing skin inside the well to add strength. I'll get to building the other side and see how I feel about it then. I will have to deviate from the instructions some more and skin the top of the wings first so I can detail the wheel wells. I am very happy that the gear fits perfectly and has about 2-3mm of clearance on the top and the bottom.

I still have to add shear webbing to the secondary spar and complete the sheeting of the inner well. Am thinking of adding rivets etc as well. I'll also be running the airlines around the inner well.

Retract Gear I Used
For anyone interested in what retract gear I am using I have listed it below. Thanks again to John (aka Flight 21) for doing all of the hard work nutting this all out. I just copied his set up!

- Robart 137 Treaded Wheels 4"
- Robart 660 Straight Robostrut 7/16"
- Robart 550RS 90 degree Main Gear
- Robart 121 Retractable Tail Wheel
- Robart 165 3/8" Air Cylinder 1" Stroke
- Robart VRX Air Control System

Hmmm seems like a Robarty theme going on there...

Anyhoo more to come...
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Jan 08, 2009, 10:21 PM
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countrygentleman's Avatar
Beautiful work! Beautiful...
Jan 14, 2009, 04:26 PM
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Gree's Avatar

Continuing on the Wings

Thanks Country Gentleman.

Just thought I would post a little more progress. Basically have both wing frames finished. I saved my self SO much time for the second wing by measuring all the mods from the first, such as spar placements etc, and cutting all of these into the ribs before assembly - it virtually fell together after that.

Wheel wells still to be detailed, and you can see I have not finished painting them yet, will do so after two halves are joined so I can fill the area where the dihedral crutches go.

I am a bit worried about the strength of this join given the fact I will have to remove just under half of the length of these crutches because of the wheel well. We'll see I guess!

Still have to route airlines, servo wires, and work out a bomb release mechanism before beginning sheeting.

If anyone knows of a nice neat way to make the bomb release system for the wing pylons I am all ears...
Jan 16, 2009, 06:06 AM
Registered User
You certainly have been busy. This thread is going to make my build go a lot easier. Regarding that join and the shortened dihedral crutches; would the use some carbon fibre tape bonded to the crutches provide any needed strength?
Jan 16, 2009, 09:06 AM
Zzzt! Buzz! Click!
squidbait's Avatar
Originally Posted by Gree
Anyone have any really interesting paint schemes they would like to suggest?
How about these?

Originally Posted by Gree
They have to be aluminum based, as I do not want to go for full paint.
Too bad, because there's some really interesting options if you're willing to paint. The full aluminum ones tend to be variations on a theme... the markings change, but it's still a big silver airplane.
Last edited by squidbait; Jan 16, 2009 at 05:51 PM.
Jan 16, 2009, 05:23 PM
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Gree's Avatar
Thanks Squidbait, but all I am seeing is missing images with little question marks! Any chance you could repost the pics?

Thanks for the idea RussK. That might help, and I was also thinking last night that I may put in another dihedral brace on the rearmost spar that I added to the wing, so the load is distributed more. I think this may help a lot.
Jan 16, 2009, 09:04 PM
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squidbait's Avatar
Hmmm... apparently it doesn't like it when I embed the images directly. I've changed them to links.
Jan 16, 2009, 10:36 PM
Pursuit of Happiness
Ron101's Avatar
it's been awhile since I checked in on yay..
well the plane is looking really good

I see your going to try your first glass job
if you havn't checked it out tom peirce has a great web site on two of his builds... I've used his methods and there very good

check it out:

it's almost all water based which is nice to work with

Jan 17, 2009, 12:19 AM
Registered User
Gree's Avatar
Thanks for fixing those links Squidbait, and hi Ron101 thanks for the comments and thanks very much for the links!

I will definitely check it out. Though I think I am going to use resin, as I have heard water based glassing does not have the same level of toughness... plus I just bought all my materials!

I just epoxied the wings together. I ended up making another wing dihedral brace and moving it to the rearmost set of spars, so at least the wing has bracing on the load bearing spars. Photos later.

VERY happy to have input from you guys. Makes it a less lonely journey!
Jan 17, 2009, 02:40 AM
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Gree's Avatar
Wow Ron I just looked at those sites you sent me. These are going to be a HUGE help for the detailing etc when I get there. Thank you so much!
Jan 17, 2009, 11:53 AM
Pursuit of Happiness
Ron101's Avatar
no problem my friend
that guy is an artist really nice stuff

well it's going to be 70 degrees here today!!
time to load up and go fly

I'll check back soon

Jan 17, 2009, 11:55 PM
Registered User
Gree's Avatar

Joining The Wings

Dihedral Bracing
I wasn't all that happy with the way the dihedral braces would be cut short and not joined to a load bearing spar. After thinking about it for a little while, I decided to make another dihedral brace out of scrap ply, and add a third brace to the spar I added in the rear of the wing. This is the idea I mentioned above, and I am happy that it stiffened up the wing considerably.

Doing this wheel well modification (ie removing the main spars) makes the wing joining phase incredibly difficult because the area in the centre of the wing becomes incredibly fragile with all of the wood removed to accommodate the braces.

It turned into a very tricky process, and it did not turn out perfect, but the wings lined up perfectly on the jigs, so at least I know the dihedral angle is correct!

Finally Smoothing Out the Wheel Wells
After the excess length of the braces was cut off and smoothed with a Dremel, I bogged up the area ready for final smoothing and paint. Hopefully this will turn out nice and smooth.

I couldn't resist taking a couple of shots with the fuse roughly sitting on the wing. I am getting closer to having an aeroplane!

I'm now waiting on some parts to arrive from the US so I can make up my bomb release mechanisms...
Jan 18, 2009, 08:44 AM
Registered User
Very nice Gree! I like that wheel well mod on the wing.
Jan 18, 2009, 09:52 AM
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countrygentleman's Avatar
Beautiful like always. I am very inspired by your build.
Jan 19, 2009, 03:06 AM
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Gree's Avatar

Beginning to Detail the Wheel Wells

Reinforcement Rings

Now I know these should ideally look as if they are pressed into the metal, but to be honest I could not be bothered sanding the parts I made to a half-round shape. I might regret it later but... too late!

I made these from styrene sheet, 1.5mm thick. On reflection, a thinner sheet would have looked a LOT better, because it may not have looked so square, and been more subtle. Oh well. Once painted green with all of the gear in there it should look OK I hope.

Bolts done with blobs of PVA glue. Not that happy with them and need to work on my technique.

More on this as I get it done...

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