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  #1  
Old 01-03-2010, 06:20 PM
elippse elippse is offline
 
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Location: Arroyo Grande, CA
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Default Jim Smith's RV-6 wing tips

Have any of you seen Jim Smith's new wing tips on his RV-6? They've upped his AR from 4.8 to 5.8, increased his span to 26' and his area to 116 sq. You can contact him at elippsefppropsales@gmail.com, and ask him for some pix and performance data!
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  #2  
Old 01-03-2010, 06:32 PM
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n5lp n5lp is offline
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Default Nope

Quote:
Originally Posted by elippse View Post
Have any of you seen Jim Smith's new wing tips on his RV-6?...
I haven't. Is it possible? There must be a photo somewhere on the Interweb.
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Last edited by n5lp : 01-03-2010 at 06:35 PM.
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  #3  
Old 01-03-2010, 06:35 PM
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LifeofReiley LifeofReiley is offline
 
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Default

And you can post this info here pics etc... ??
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  #4  
Old 01-03-2010, 07:27 PM
fehdxl fehdxl is offline
 
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Location: Bellevue, NE
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Default here you go...

Not the best picture, but the only one I can find right now. This was at Table Rock, MO in Aug '09.


-Jim
40603, fuselage

Last edited by n5lp : 01-03-2010 at 07:32 PM. Reason: Edited image link for bigger photo
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  #5  
Old 01-04-2010, 01:53 AM
Bob Axsom Bob Axsom is offline
 
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Default What is the purpose?

I met Jim Smith in Wichita a while back and he seemed like a reasonable guy. He was flying in the cross country air race with a prop that you designed I believe - it looked like the one in the previous post photograph. I am currently working on molds for wingtips that will reduce the total wingspan to approximately 21' 1" for speed improvement. Why is Jim increasing the span to 26 feet? I assume he is looking for better performance at high altitude or some STOL performance. Has he changed the gross weight? Is he adding fuel out there? Just idle curiosity - I'm going the opposite direction.

Bob Axsom

Last edited by Bob Axsom : 01-04-2010 at 01:58 AM. Reason: added fuel question
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  #6  
Old 01-04-2010, 05:04 AM
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pierre smith pierre smith is offline
 
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Default My concern....

....would be the added bending moment on the center spar structure. That's a lot of wing added.

Best,
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  #7  
Old 01-04-2010, 09:00 AM
WingsOnWheels WingsOnWheels is offline
 
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Default

While we are on the wingtip subject, has anyone tried small winglets?
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  #8  
Old 01-04-2010, 10:24 AM
rv72004 rv72004 is offline
 
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Quote:
Originally Posted by pierre smith View Post
....would be the added bending moment on the center spar structure. That's a lot of wing added.

Best,
I was thinking the same thing actually. Does Vans have a point of view on lengthened tips ?
My Glasair III wanst rated to 6g with the extended tips, only 3.8 if I remember correctly. 6g only with short wing.
The tips really slow up the roll rate and stall speed. Speaking from experience.
Me thinks vans should be consulted before installing these long tips......
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  #9  
Old 01-04-2010, 11:50 AM
Bob Axsom Bob Axsom is offline
 
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Default Van does not like the wings to be lengthened

I discussed this with him briefly in October of 1996 when I was at the training session at North Plains, OR and I was going to install the 9" wide (18" added wing span) tip tanks. He was very uneasy about it and advised me to add the tankage inside the design envelope like Jon Johanson had done. I have flown the 24.5' wingspan for years with no problem but when I go to the 21.5 feet in the racing configuration the roll rate is noticably faster. I am working on a 21.08' configuration.

Bob Axsom
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  #10  
Old 01-04-2010, 01:25 PM
Sid Lambert Sid Lambert is offline
 
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Default

It looks like a giant delta dyke from that angle.
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