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  #61  
Old 08-22-2015, 11:00 AM
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rvbuilder2002 rvbuilder2002 is offline
 
Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 9,792
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Quote:
Originally Posted by Truthinaction View Post
AAAAAA +++++++ Thank u. Vary much. I really appreciate people like u doing out of the box thinking then actually doing it .

I talked to over 20 owners at eaa including vans they told me it can not be done then laughed at me.

I explained to them I am a student piolt and we were doing some investigating on what makes the rv which is a amazing plane and my plane of choice witch I am putting the finish touches on mine as we speak !!! So awesome HAS ANY ONE ELES DONE ANY OTHER CAN NOT DO MODS !!!!! I WOULD LOVE TO KNOW ABOUT !!!! TNKS TO ALL OF U ON THIS GROUP ps some one told me there was a wing mode.cut 45deg
So, if I put an 800 HP turboprop engine on the front of my RV-9A and it results in a way out of spec C.G. position and breaks all kinds of standard engineering practices, but I successfully fly it without hurting my self or anyone else..... does that mean it is a good idea?

Experimenting is good. But if you are going to experiment you should get educated on all of the engineering disciplines that could come into play with what you are designing / experimenting with.

A significant one has been pointed out in this thread. No comments provided whether it was considered or whether testing is being done to verify it is an issue.....
If that is the case, that is not the type of experimenting this peer group should be encouraging IMHO.
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Van's Aircraft Engineering Prototype Shop
FAA/DAR
RV-6A (aka "Junkyard Special ")
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  #62  
Old 08-22-2015, 11:32 AM
jrs14855 jrs14855 is offline
 
Join Date: Apr 2008
Location: Lake Havasu City AZ
Posts: 2,770
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Originally Posted by curtis View Post
The plane pictured in post #56 of this thread is not used for storage or fuel. I know Jim who owns this plane, who worked with Paul Lipps on the design. If I remember correctly, the tip helps keep the nose lower at altitude by moving the lift at the tip aft. All of Paul's designs are way above my head, all I do is follow the manual and build what Van has designed.

Note: The three bladed prop is also a Paul Lipps design.
The late Paul Lipps did a lot of great design work, and I don't wish to take away from that, only to set the record straight.
The tapered wingtips as seen on the green RV6 were designed by Steve Wittman in the mid 70's. The tips as designed and tested by Wittman resulted in a substantial reduction of the power off sink rate at speeds in the approach speed range. High altitude cruise performance is also improved because of reduced loss due to wingtip vortices and reduced span loading.
Boeing also tried to take credit for this wingtip design but ultimately abandoned it in favor of winglets.
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  #63  
Old 08-22-2015, 12:06 PM
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curtis curtis is offline
 
Join Date: Jan 2005
Location: Kansas
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Not saying Paul was the initial designer, just did the work for making them work on an RV. In reality most all wing designs are old and someone has already done something with them, unless you are talking Scaled Composites which is always breaking new grounds with their designs.
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