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  #21  
Old 03-28-2012, 09:08 PM
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Rosie Rosie is offline
 
Join Date: Dec 2004
Location: I live in on the Rosamond Skypark (CA) and am married to Victoria (Tuppergal).
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I've been meaning to post this and will get more pics up at a later date (with a better view from the top).

Here's an RV-8A with RV-4 wings and was built by a craftsman from the 'Bakersfield Bunch' Rosie

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Paul A. "Rosie" Rosales
Rosamond Skypark (L00), CA
RV-6A, 4200+ hours since 7/4/2000
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  #22  
Old 03-29-2012, 01:45 AM
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rvmills rvmills is offline
 
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Location: Reno, NV
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Quote:
Originally Posted by pierre smith View Post
...are our tips on my -10 not fairly close to being of Scimitar design? Those and also the two seaters with the "batwing" type tips?

Best,
Pierre,

Just back from a trip, and catchin' up. I know what you're saying about the batwing tips, and the scimitar tips do have a bit of that scalloped shape at the trailing edge. However, in talking with Eric, he said the leading edge shape was computer modeled, and the changes in span vs chord are very mathematically specific. If I gathered it all correctly, the math was part of multiple experiments, and the modeling and results surprised them.

In the RV world, the tips that come to mind when I look at the scimitar tips are Jim Smith's triangular tips of Paul Lipps' design. There are differences in shape, but the increased span with minimized area increase due to the shape is something Paul talked a lot about. It almost looks like an elliptical tip in the front half, with a batwing shape in the back half.

I'll ask Eric more about the "why" of the design's success on the L-29 and -39 next time I see him. Interesting stuff tho!

Quote:
Originally Posted by Rosie View Post
I've been meaning to post this and will get more pics up at a later date (with a better view from the top).

Here's an RV-8A with RV-4 wings and was built by a craftsman from the 'Bakersfield Bunch' Rosie
Rosie,

Nice looking plane, for sure! Did you ever hear about its performance with the hybrid wing?

Neat to see all the experimenting going on!

Cheers,
Bob
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Bob Mills
RV-6 "Rocket Six" N49VM
Reno-Stead, NV (KRTS)
President/Sport 47/49, Sport Class Air Racing
President, Formation Flying Inc (FFI)
Flight Lead, Lightning Formation Airshows
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  #23  
Old 03-29-2012, 10:13 AM
PaulRomano PaulRomano is offline
 
Join Date: Jun 2007
Location: Longmont, CO
Posts: 26
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Bob--

I just caught your post #19, and I would like to track down something you said:

"...the g limits remain the same with my higher gross weight. That was a key element of the design feature, from what I've been told. "

May I ask who told you this? I spoke to John Harmon personally--probably 15 years ago--and this is pretty much what John said about the original Rocket. But when I pressed him on how he came to those conclusions, he said the wing had been analyzed by an engineer. But I never could find out who did the analysis, the extent of the analysis, and the type of analysis.

The -4 wing and -6 wing are similar (they may be identical, I'm not that familiar with the -6), and the -4 is rated at +6/-3 g at 1375#. Most Rockets are now pushing 2000# at gross, so I think it is a question worth tracking down.

I'm flying an F1 Sport Wing, and love it. But very few Rockets or RVs are operated even close to 6 g's (as I am sure you remember, 6 g's are memorable!).

I'm really not trying to be argumentative, but this is a data point I think is important, and would like to find the seemingly elusive engineer who did the
analysis, and buy him/her a beer. And we could probably reminisce about slide rules.
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  #24  
Old 03-31-2012, 12:16 AM
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rvmills rvmills is offline
 
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Paul,

Just saw your PM and this post. Not taken as argumentative at all. Actually, I'd like to know the details too if you can find them. I was told this by my seller, an F1 Sport Wing builder (and a smart guy and trusted friend). Still, word of mouth, and I know you seek more...which aint a bad thing!

Having the same number of ribs in the shorter span was the heart of the discussion, but it was not any more technical than that.

F1 Boss may have some more gouge on it, or perhaps Smokey, Rick G, Tom M or another of the multi-Rocket builders can add what they know on the subject.

Its a valid question, to be sure.

I would agree with your statement that few Rockets or RVs are operated regularly at 6g (I don't)...and unless one's going really fast, its doubtful that one would be able to sustain 6g for very long. However, bury the nose in a maneuver and you could be faced with needing that capability to recover (and don't forget to pull the throttle!!). Hopefully we plan ahead and don't get there...but knowing the airplane can handle its limits at full aerobatic weights is a good thing...and I figure that's the knowledge you're after.

Will shoot a PM to Mark and see if he can comment.

Cheers,
Bob
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Bob Mills
RV-6 "Rocket Six" N49VM
Reno-Stead, NV (KRTS)
President/Sport 47/49, Sport Class Air Racing
President, Formation Flying Inc (FFI)
Flight Lead, Lightning Formation Airshows
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