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  #41  
Old 09-19-2017, 11:28 PM
TXFlyGuy TXFlyGuy is offline
 
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Location: Jazz Town, USA, TX
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I ask again...what precautions are taken to allow exceeding published Vne by up to 100 mph?
Do the RV racers routinely exceed Vne, like the Glasair pilots?
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  #42  
Old 09-20-2017, 06:43 AM
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n981ms n981ms is offline
 
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Default Changes to exceed Vne?

I doubt you will get many answers.

Racing is dangerous. It pushes the boundaries. It shows what is possible and unfortunately sometimes the limits are exceeded and things break. Racers have weighed the risk and have decided for them it is worth it. I applaud this. (For myself I doubt I will ever have the courage.)

Why no answers to the question? Either they did or they did not make changes.

If they did modify the airframe.
1. If they admit it here they will surely be flamed for making changes not approved by Van's.

If they did not.
2. They have decided the extra margin built in by Van's is good enough for race purposes. Which could be argued is different than typical sport flying purposes. If they chime in someone here will flame them for not following Van's limitations.

Maxwell
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  #43  
Old 09-20-2017, 07:25 AM
TXFlyGuy TXFlyGuy is offline
 
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That certainly is understandable. It's a lose-lose situation.

Best to keep quiet.

Last edited by TXFlyGuy : 09-20-2017 at 09:46 AM.
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  #44  
Old 09-20-2017, 07:29 AM
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bret bret is offline
 
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There are some post in the past showing the mods that some have done to the tail on the Rockets ect, don't quote me, going on memory... tie stiffeners together, thicker skin, 1" angle longerone and lots of other top secret stuff I don't know about. On my 7a I did the ASA VS plates and the HS spar SB. just for comfort level, not racing.
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  #45  
Old 09-20-2017, 07:51 AM
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airguy airguy is offline
 
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If someone does make changes, there will be a hundred people to criticize them and none of them would be satisfied until a complete Boeing-level aerodynamics engineering review has been done - which simply isn't going to happen. There is no advantage to even discussing changes they may or may not have made, or what engineering went into those decisions.

They are also not about to discuss "trade secrets" among competitors on an openly-read forum like this.
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  #46  
Old 09-20-2017, 07:57 AM
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FlyFastJP FlyFastJP is offline
 
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That's too bad, really. I'm based at a great airport where there is a section called "RV Hill". Great guys and builders with a wealth of knowledge. But, of those I've talked to, none race, so I'm limited in my gathering of that aspect. I'm a speed demon...I love going balls out. I wish those that push the design would be a little more open. Heck, it might even save a few planes.
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  #47  
Old 09-20-2017, 09:56 AM
TXFlyGuy TXFlyGuy is offline
 
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Location: Jazz Town, USA, TX
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While it is not a secret, in the development of a high speed wing the manufacturer added a second spar. This wing was originally designed to be raced at Reno. It will be there next year in a clipped wing version.

Advertised as a +9 G wing, but built to take over 10 G's.
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  #48  
Old 09-20-2017, 10:45 AM
TXFlyGuy TXFlyGuy is offline
 
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Quote:
Originally Posted by Chkaharyer99 View Post
Was the tail tested at those speeds? Was it modified?
The entire airframe was tested for certification in the U.K.

A forklift was used to induce dynamic loads on the tail, plus weights were used on the wings. The plane withstood 12.7 G's. At that point, the wing skin showed a trace of wrinkles.

No mods. The new wing has a double spar, but it was not subjected to the U.K. testing process.
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  #49  
Old 09-26-2017, 05:57 PM
Ulrich Ulrich is offline
 
Join Date: Mar 2008
Location: Citrus Heights, CA
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Quote:
Originally Posted by n981ms View Post
I doubt you will get many answers.

Racing is dangerous. It pushes the boundaries. It shows what is possible and unfortunately sometimes the limits are exceeded and things break. Racers have weighed the risk and have decided for them it is worth it. I applaud this. (For myself I doubt I will ever have the courage.)

Why no answers to the question? Either they did or they did not make changes.

If they did modify the airframe.
1. If they admit it here they will surely be flamed for making changes not approved by Van's.

If they did not.
2. They have decided the extra margin built in by Van's is good enough for race purposes. Which could be argued is different than typical sport flying purposes. If they chime in someone here will flame them for not following Van's limitations.

Maxwell


Some planes have mods for strength, some don't. A tail can be broken anytime you're flying over Va (142m) and use full deflection. So 250 mph at Reno is about 230 mph indicated..so at Vne, not over (by much). Just my observation.. but it would seem that acro breaks more stuff than going fast..G loads in a loop are more than around the Pylons.

The General Lee has a stock tail for now. Upgrades are in the works before I'll push the black knob all the way in.

Here's the disclaimer: I'm not recommending that anyone should experiment with their experimental! Since every plane is built differently, the results will also be different.
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