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Landing gear bracing - 7/28/2012 9:12 PM   
impulse09



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Status: offline 		What is the best method to brace a standard two-piece set of main gear? I was thinking of some sort of rod running from the axle lock nut to a mounting bolt on the opposite side X2, like the red lines in the picture. Or maybe something with springs?

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RE: Landing gear bracing - 7/28/2012 10:20 PM   
Campgems


 

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Status: offline 		The stouter you make the landing gear, the more likely you are to rip out the landing gear mounting  from the fuselage on a hard landing. 

Don

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RE: Landing gear bracing - 7/28/2012 10:38 PM   
curtrc


 

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Status: offline 		True as that may be, that isn't really a helpful response. I am interested in this too for my Pitts scratch-build. The gear is too springy and I am considering some wires.


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RE: Landing gear bracing - 7/28/2012 10:58 PM   
impulse09



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Status: offline 		Stock gear is flexing due to the weight of the airframe.

Besides, I never have hard landings.

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RE: Landing gear bracing - 7/28/2012 11:27 PM   
All Day Dan


 

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Status: offline 		impulse, another way is to get a landing gear made from thicker stock. Try these guys. Dan.
http://tntlandinggear.com/

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RE: Landing gear bracing - 7/28/2012 11:33 PM   
Boomerang1



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Status: offline 		Rigid bracing will snap in no time so you will need springs if you go that way.

I'd go with Dan's idea, new stiffer undercarriage, probably the quickest easiest, cheapest method. - John.

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RE: Landing gear bracing - 7/28/2012 11:49 PM   
Live Wire


 

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Status: offline 		Like your drawing, Wire from wheel to wheel and from one mount bolt to the other with a rubberband or spring in the center like the J 3 CUB. It is more ridged ,but still has the bounce.

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RE: Landing gear bracing - 7/28/2012 11:55 PM   
impulse09



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Status: offline 		I see that TNT has the gear that I need, the only question I have is whether the gear is stronger or similar to the stock gear. Do they improve upon the stock gear, or just offer replacements?

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RE: Landing gear bracing - 7/29/2012 1:26 AM   
All Day Dan


 

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Status: offline 		impulse, I have ordered several custom gears from them and each one has been perfect. If the one they already have is made from thicker stock, then try it. If not, go to their custom order sheet and fill in the dimensions you need from the gear you have. Choose the next higher aluminum thickness than the one you have. It should be good enough. By the way, how much does you plane weigh? Dan.

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RE: Landing gear bracing - 7/29/2012 2:18 AM   
impulse09



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Status: offline 		15lbs dry.

Can TNT drill the gear out?

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RE: Landing gear bracing - 7/29/2012 2:46 AM   
All Day Dan


 

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Status: offline 		impulse, use 3/16 inch aluminum at that weight. I mount my wheels and sometimes wheel pants to the gear with 1/4 inch bolts and the gear to the plane with 1/4 inch nylon bolts. You can see them in the attached image. I have no problem drilling the 1/4 inch diameter holes required with a 1/4 inch drill in a drill press. Ask the nice lady that answers the phone at TNT if they would do it. Dan.

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RE: Landing gear bracing - 7/29/2012 3:00 AM   
impulse09



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Status: offline 		My stock gear is 1/8". I'll see how it holds up tomorrow.

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RE: Landing gear bracing - 7/29/2012 9:28 AM   
Rotten40851



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Status: online 		Why not take some flat stock aluminum straight across from strut to strut 1/3 up from the wheels. bend a 45 degree angle on each side drill it out and bolt it on.  I have done this on wire gear as well with a peice of 1/4 inch brass tubing flattened 1 inch on both sides, bent to match the angle of the gear and soldered on to the wire. It works very well.  HTH 

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RE: Landing gear bracing - 7/29/2012 10:56 AM   
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Status: offline 		Once you stiffen the gear, you might consider mounting with 1/4-20 nylon bolts, if you haven't done so already. Protect the structure just in case.

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RE: Landing gear bracing - 7/30/2012 2:28 AM   
N1EDM



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Status: offline 		To add my ideas to the mix, take a look at a J-3 Cub gear. It's very similar to the diagram that you drew in Post #1. Just add some compliance (O-Rings, etc) and see what you have. An even simpler idea is from the Hangar 9 J-3 Cub 40 LG at:

http://www.horizonhobby.com/products/landing-gear-j-3-cub-40-HAN4005

It's not all that exotic but it does have some compliance just from the wire. For the record, that black cylinders are just plastic decoration to simulate the bungees.

Just adding my $.02

Bob


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RE: Landing gear bracing - 7/30/2012 3:08 AM   
impulse09



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Status: offline 		I'll take all the cents I can get.

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RE: Landing gear bracing - 7/30/2012 5:36 PM   
FlyerInOKC



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Status: offline 		I have the Hobart Cub gear on my 1/5th Cub and they suspension works quite nice. You could use this gear as a guide and use "O" rings like Hobart does to provide the resistance.

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