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If you are going to just take your stuff and start drop tests, at least give yourself a chance to learn something from the tests. You check it out statically up to 2x max gross, then adjust ballast on your rig to 1x max gross, and drop it from a hieght.
Better to find the values for your material (they are all pretty well known, can be found on the web too, and we can help) and do most of the sneaking up on the computer. This is the Ibis gear, looks pretty massive, at least two inches thick and 6 inches wide, from the description it is laminated from plywood, I assume birch. Originally Posted by George Sychrovsky This is the Ibis gear, looks pretty massive, at least two inches thick and 6 inches wide, from the description it is laminated from plywood, I assume birch. Considering ash is a very useful wood in the construction of longbows, an undercarriage made on the same principles ought to work fine. Originally Posted by PTAirco Considering ash is a very useful wood in the construction of longbows, an undercarriage made on the same principles ought to work fine. Originally Posted by PTAirco just before failure and you can see compression wrinkles Thanks for the info.
The stress analysis for the landing gear is sort of opposite the long bow scenario in that the wood is pre-stressed to a bent shape and then the landing forces will try to straighten the wood.
There's been a lot of good discussion of wood properties in this forum--the bottom line always highlights the unpredictability of wood.
My point is mainly that wood can be a great engineering material, but it has its limitations just like any other.


I'll start by working up to a static load test to a load factor of 2 then start dropping from 6 inches at MAGW and work my way up. If you put a recording g-meter on the rig, you will know what happens as far as peak forces. I spent some time on the computer trying to figure out all this design and engineering stuff. Your results seem to disprove the notion that wood is resilent in that you can bend it back and forth to a certain point countless times without it losing strength or integrity.
I'm not totally discouraged from the wood landing gear project but I have a healthy dose of fear and uncertainty. That way, when it goes CRUNCH!, at least you will know that its strength was exceeded somewhere between the last pass and the failure.
My hunch is the flexing of the lamination will be the problem I'm quite certain this gear is not strong enough but if the test results show any potential I'll construct another gear with more laminations. When you get to first fiber failure (it will sit lower after that run by some tiny amount), you will know that you were not strong enough, and what the g's were at that failure.
If your g's at failure before were pretty low, you are Ok, but if they are above 2.5, you will likely exceed 3 on the beefed up part, which starts to make your attaching hardware pretty heavy. I stared at ANC 18 and the landing gear design speadsheet available on the EAA website for hours.
If you were able to draw the bow once to your given draw length without a compression failure I would have thought you could have done the same bend countless times.


If you just go for the full height for your wing loading, you won't know how close (or how far) you were. I've done much research on bending and laminating wood and woodworking is a passion for me.
I've concluded that the lamanated gear I've made will make a nice piece of modern art--I'll hang it inverted from the ceiling and put some candles on it. Also, since the load is spread out over 3 points, the mains 'suck-up' less of the force through flexing. Probably more so than you would see in a landing gear, unless every landing you made was really awful. Now that I have a target of 3X load factor and 18 inches, I'll observe how the laminations react to stress and go from there to modify the design. I believe longbows are straight when unstrung--did they fail when you were stringing them or when you were shooting them?



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Author: admin | 12.03.2015 | Category: How To Build A Garden Shed


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