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Clive J
Joined: 03 Nov 2007
Posts: 340
Location: UK
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 Posted: Thu Sep 13, 2012 6:14 am Post subject: Landing Gear and wing drop at the stall |
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Good info thanks Nick, and interesting. A couple of questions if you’ve a moment?
When I bought new U/C legs for my Esqual from you in 2009 what would you have supplied? Lightning gear or Esqual (‘something lighter in alloy’).
Are they physically the same size and so interchangeable?
Do you have any suggestions as to how I could change the gear leg material to make the legs more springy? More forgiving of bumpy grass runways?
Wing drop at the stall.
Regarding the Esqual, I still have the aircraft on a test permit and the LAA engineer is still not 100% happy with the performance. The final (I hope) issue is wing drop at the stall. CS-VLA calls for less 15 degrees and during testing we were getting more than that. So we plan to do some more work with stall strips. Currently I fitted a single strip, see attached. We’re going to try another one outboard. Appreciate comments anyone has on the wing drop issue? There was talk of VGs but as I think they look awful and spoil the clean lines of a wing I’d like to avoid them.
Thanks, Regards, Clive
From: owner-lightning-list-server(at)matronics.com [mailto:owner-lightning-list-server(at)matronics.com] On Behalf Of Nick Otterback
Sent: 12 September 2012 17:03
To: lightning-list(at)matronics.com
Subject: RE: Lightning-List: Landing Gear and shimmy
I think you might mean springy not stiff. During drop test at gross weight, we have nearly 6” deflection of the landing gear system. The little tube in a tube is an easy way to check deflection, set against the ground before the drop and see how far it gets displaced. Usually the bounce comes from the nose gear return and the aircraft going back into a flight attitude with sufficient speed to fly.
Attached some pics for fun. The drop test were the funnest testing we did, along with destructive testing of the wing.
Nick
From: owner-lightning-list-server(at)matronics.com [mailto:owner-lightning-list-server(at)matronics.com] On Behalf Of Dennis W. Wilt
Sent: Wednesday, September 12, 2012 9:18 AM
To: lightning-list(at)matronics.com
Subject: Re: Lightning-List: Landing Gear and shimmy
My EA-B version of the LSA has the LSA gear just because they are supposed to be a bit more sturdy. My only complaint with the lightning gear is that it is not very forgiving on landing. It is pretty stiff, so if you happen to land a little hard, you will bounce and that means a go around for me. Some of you may be better at saving such a landing, butI choose to go around and do it again, hopefully without the bounce.
I set my toe to 0 degrees without weight on the wheels and keep my air pressure around 25 psi. I have never had the shimmy.
Have a wonderful day,
Dennis
N616DW (Arion LightningS/N 132)
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dwwilt
Joined: 06 Dec 2010
Posts: 192
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| Posted: Thu Sep 13, 2012 7:29 am Post subject: Landing Gear and wing drop at the stall |
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Grumman put the same stall strips on the Cheetah and Tiger.
Have a wonderful day,
Dennis
N616DW (Arion LightningS/N 132)
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Bill Strahan
Joined: 20 Aug 2008
Posts: 145
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| Posted: Thu Sep 13, 2012 2:29 pm Post subject: Re: Landing Gear and wing drop at the stall |
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| dwwilt wrote: | Grumman put the same stall strips on the Cheetah and Tiger.
Have a wonderful day,
Dennis
N616DW (Arion Lightning�S/N 132)
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Yep. One on the inboard 3rd, one on the middle 3rd. No strip on the outer 3rd of the wing panel. The one on the inboard 3rd is right at the front of the leading edge. The middle strip is much further down, about where the leading edge would be at a 15 degree angle of attack.
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Clive J
Joined: 03 Nov 2007
Posts: 340
Location: UK
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| Posted: Thu Sep 13, 2012 10:54 pm Post subject: Landing Gear and wing drop at the stall |
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Thanks Bill, just surfing to buy some balsa wood
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