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Need some help sizing retracts...

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Need some help sizing retracts...

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Old 07-29-2007 | 09:35 PM
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Default Need some help sizing retracts...

Hey guys,

Im looking for some advice on picking the right retracts, and finding the right retracts for my next rc jet project. I am doing an EDF F-14. It is 56" long 58" wingspan and will be running 2 90mm EDF on 8 cell lipos. Im estimating the RTF weight to be 10-15lbs. Where can I find a decent set of retracts to handle this weight, has oleos, nose wheel brake (or two nose wheels if I were shooting for scale)

Problem is I never built retracts into any of my planes untill now. Ive flown and built jets that have all been bungee launch or 23% 3D gassers with fixed gear. I'm not really sure how to size a set of retracts not to mention incorporating gear door mechanisms into it. Im also unsure how many degrees of retract I need, 75, 90, 105.... isnt helping me make a decision

Any advice in this area is greatly appreciated, once I can find the right retracts I can dig into my build.

Bug
Old 08-01-2007 | 11:45 AM
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Default RE: Need some help sizing retracts...

Bug, One way to get a good idea is to go to the Robart web site. They have setups for many existing aircraft. Look at what they are recommending for something similar (in size/weight) to what you are building. Also, I (personally) think that nosewheel brakes are problematic .... I would put it on the mains .... or not have a brake at all. Bob
Old 08-01-2007 | 02:54 PM
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Default RE: Need some help sizing retracts...

Putting them on the mains was my first thought, but I need rotating mains for space reasons and im not sure if that will be a problem for brakes... If I can not get something thats not to heavy without brakes another thought I had was to just have a spare channel toss a chute out of the tail to slow it down.

I looked at the robart site and they have the 800 series rotating for 8-16 lb planes, but I cant find a distributor. Im guessing they are just off the line or not in production yet?

Thanks for the help

B

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