Retract mounting plate? - RC Groups
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Nov 17, 2012, 10:39 PM
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CoolerByTheLake's Avatar

Retract mounting plate?

In the attachment below is a section from a BVM F-86 wing, showing the gear plate for the retract mounting. I am scratch building an F-86 using some of the same methods.
Now, if I wanted to spend tons of money I could use his flex plates, but would also have to buy his retracts. Not an option! Will be using Robart 530RS mains. Robarts are too narrow to use the BVM flex plates.
AS you can see in the photo, the gear plate is secured to the fore and aft spar, with a center support. The size of the gear plate is approx 6.5" long x 3.5" W.
The WS is 65.5" and weight will be around 15lbs.

I have a couple of ideas on what to use, but would like to hear your ideas. 1/4" ply is not an option, to heavy. Something strong, yet lightweight. Any ideas??
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Nov 17, 2012, 10:57 PM
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solid G-10, 1/8" ply laminated with G-10, Phenolic, aluminum....
Nov 18, 2012, 01:07 AM
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CoolerByTheLake's Avatar
Thanks invertmast. My thought was close, use 6-ply 1/8" with CF. What thickness G-10 would you suggest along with the 6-ply?
Last edited by CoolerByTheLake; Nov 18, 2012 at 07:06 AM.
Nov 18, 2012, 05:31 AM
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epoxyearl's Avatar
I used some 3/32 carbon fiber plates for a wierd mounting set-up in a Ziroli F9F,that worked really well.It's a comfort knowing the plate won't break,if your mounting blocks are up to the task.
I'd like to inject that you should save some weight elsewhere,never at the gear mountings.If they tear out,you'll have the wasted time to repair,and the added weight of the repair also...
If possible,a couple of 'fingers' to tie in to the LE are always helpful.
The G-10 will work well; I just had the C/F on
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Nov 18, 2012, 09:55 AM
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If you use a piece of 1/8" aircraft ply, you would probably be fine with some .030 g-10 laminated on both sides.

But honestly, i've never made a flex plate, i just bought what I needed from BVM. You'll probably need to do some experimenting (read spend money) and get some different thickness' of g-10 and see what is best for your application.
Nov 18, 2012, 11:05 AM
Bellanca Kruesair
epoxyearl's Avatar


Or-you can PM your mailing address,and I'll send you two of these carbon fiber plates for shipping costs.
I like F-86's what can I say ?
These two are 4-7/8" ,x 7-3/4 "....3/32 thick.
Latest blog entry: Rut-roh !
Nov 18, 2012, 12:33 PM
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CoolerByTheLake's Avatar
You can't get a better deal than that! Will send PM.

Here's my specs on the F-86F-

Scale=1. 7.151
WS =65.65"
Wing Area=967.9 sqin. AUW TBD, but@14lb=33.33oz sqft, 15lb=35.7oz sqft.
NOTE: Will be closer to 15lbs.
Projected power package--JetFan 90/Neu1518/1.5Y

Link to build thread-
Jan 31, 2013, 12:09 AM
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p901P901's Avatar
Hey guess what I am working on.------------------Gear Plates
I usually maiden my planes at a nearby dry lakebed that has a cobblestone like surface. And because of all the vibration I'm having problems with #4 screws stripping out of 1/8" aircraft plywood. The struts are 3/16 straight wire struts (no coil) that are 5" long.

So I am looking for an alternative system to attach the gear to.
I can see that carbon fiber is the best choice with blind nuts attached to it for the gear mount. So looks like I will be using 1/16 plate bonded with 1 layer of 6oz carbon cloth around the edges of the plywood.
Time for modifications
Hope all is well
Last edited by p901P901; Jan 31, 2013 at 01:15 PM.
Jan 31, 2013, 01:26 AM
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CoolerByTheLake's Avatar
i read your post , to bad about the damage.
Jan 31, 2013, 01:57 AM
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p901P901's Avatar
I was glad to get it back. It was so far away I almost lost it. Then it flew in front of the sun. Damage was because the gear broke. Oh well that's flight testing
Jan 31, 2013, 07:29 AM
Registered User
Dont use sheetmetal or wood screws to attach your gear. They wear the wood out over time. I only ever use machine thread bolts and blind nuts.

Also a single coil on your main struts will take care of allot of the stress going into the gear mounts.

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