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  #1  
Old 10-18-2018, 12:51 AM
mattsrv7 mattsrv7 is offline
 
Join Date: Jul 2008
Location: Seattle, WA
Posts: 59
Default RV-7 Roll Rate vs Tip Style?

I've tried to search but haven't had any luck on this question.

Has anyone flown the same -7 with the -415 wing tips and the -715 style tips doing aerobatics?

I'm curious if there is any noticable difference in roll rate or aileron feel between the styles. There's a little more area on both -715 versions around the aileron vs. the -415 in the plan view.

I really want to maximize the roll rate and feel on my -7 to try and keep it as close to my -4 as possible.
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  #2  
Old 10-18-2018, 07:55 AM
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Mel Mel is offline
 
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I did this wing-tip swap on my -6 and didn't notice any change in roll rate.
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Specializing in Amateur-Built and Light-Sport Aircraft
<rvmel(at)icloud.com>
North Texas (8TA5)
RV-6 Flying since 1993, 172hp O-320, 3-Blade Catto (since 2003)
Legend Cub purchased 12/2017
FRIEND of the RV-1
Eagle's Nest Mentor
Recipient of Wright Brothers "Master Pilot" Award
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  #3  
Old 10-18-2018, 07:06 PM
mattsrv7 mattsrv7 is offline
 
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Thanks, that helps.
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  #4  
Old 10-18-2018, 10:39 PM
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flytoboat flytoboat is offline
 
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Location: Collinsville, IL
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Quote:
Originally Posted by Mel View Post
I did this wing-tip swap on my -6 and didn't notice any change in roll rate.
Did you notice any differences?
Thanks
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  #5  
Old 10-18-2018, 11:18 PM
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rocketbob rocketbob is offline
 
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Location: 8I3
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Default

The RV-4 I've had in my possession since July has flat tips and rolls very quickly.
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N55BC RV-6 borrowed, flying
N678X F1 Rocket, under const.
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  #6  
Old 10-19-2018, 06:46 AM
judoka5051 judoka5051 is offline
 
Join Date: Aug 2010
Location: Stuart, FL
Posts: 216
Default Shorten Them!

I shortened the late style wingtips on My RV8A by 9 inches a side and got a noticeably faster than normal rate. I did have to do a bit of fiberglass work at the intersection, but it wasn't too bad. I had several folks tell me the climb would suffer, but that didn't happen. That plane climbs 1700fpm with 2 on board and half fuel... with 160hp.

Incidentally, my main goal was to keep the plane as light as possible.

Just did the same thing on the new build with older style wingtips. Hopefully with the same results.
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  #7  
Old 10-19-2018, 07:26 AM
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Mel Mel is offline
 
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Location: Dallas area
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Quote:
Originally Posted by flytoboat View Post
Did you notice any differences?
Thanks
I was hoping to see a reduction in stall speed with the increase in span. Actually the span increase is only at the trailing edge and doesn't increase the area very much.
I perceived no difference in any performance parameters at all.
Aerodynamic theory says that the original Hoerner style tips should be more efficient. My theory is that the slight increase in span/area of the new tips cancels out the loss in efficiency.
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Mel Asberry..DAR since last century
A&P/EAA Tech Counselor/Flight Advisor/Nat'l Test Pilot School
Specializing in Amateur-Built and Light-Sport Aircraft
<rvmel(at)icloud.com>
North Texas (8TA5)
RV-6 Flying since 1993, 172hp O-320, 3-Blade Catto (since 2003)
Legend Cub purchased 12/2017
FRIEND of the RV-1
Eagle's Nest Mentor
Recipient of Wright Brothers "Master Pilot" Award
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  #8  
Old 10-19-2018, 10:55 AM
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Raymo Raymo is offline
 
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A friend with an RV-8 installed some carbon fiber flush tips (with a small bump out in the middle). This was done for speed / drag reduction but would, in theory, help with roll rate.

Tried to find them on the interweb but didn't come up. If interested, I can find out where he bought them. One negative is that they do not allow for wingtip lights or antenna.
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RV-7A - Slider - N495KL - First flt 27 Jan 17
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  #9  
Old 10-19-2018, 12:53 PM
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N941WR N941WR is offline
 
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Location: SC
Posts: 11,597
Default

Quote:
Originally Posted by rocketbob View Post
The RV-4 I've had in my possession since July has flat tips and rolls very quickly.
Quote:
Originally Posted by Raymo View Post
A friend with an RV-8 installed some carbon fiber flush tips (with a small bump out in the middle). This was done for speed / drag reduction but would, in theory, help with roll rate.

Tried to find them on the interweb but didn't come up. If interested, I can find out where he bought them. One negative is that they do not allow for wingtip lights or antenna.
You could bolt on regular position lights on them and remove the tail light and strobe, thus saving weight.
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RV-9 (Yes, it's a dragon tail)
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  #10  
Old 10-20-2018, 12:21 PM
mattsrv7 mattsrv7 is offline
 
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Location: Seattle, WA
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Default

If you can find the carbon tips I'm interested to see how they look.
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