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V Speeds
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daveleikam(at)wi.rr.com
Guest

Posted: Mon Feb 11, 2008 8:03 pm Post subject: V Speeds

I thought you could just release a cord with knots spaced out on it from the 

window and see how fast they flew past the tail to get your speed????



Dave Leikam



do not archive

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bob.kaufmann(at)cox.net
Guest

Posted: Mon Feb 11, 2008 9:05 pm Post subject: V Speeds

That's only if you have a piece of wood attached to one end of the log cord.



Bob k



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poneill(at)irealms.com
Guest

Posted: Mon Feb 11, 2008 11:36 pm Post subject: V Speeds

Really Tim?  I found furlongs per nanosecond to help tremendously with the

mental arithmetic.  It was also a big help to convert the wet compass to

radians instead of degrees.  At first it was a little extra work to

accommodate ATC, but you quickly get used to it.



We should get the Mythbusters to verify the design speeds.  They love to

break stuff after building it.  That should be right up their alley.



Best Regards,

Patrick #40715 / N690CT

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tdawson-townsend(at)auror
Guest

Posted: Tue Feb 12, 2008 6:39 am Post subject: V speeds

Testing Vne reminds me of Calvin in the comic Calvin & Hobbes, when he asks his dad how they test weight limits on bridges:  

   

Calvin: How do they know the load limit on bridges, Dad?

 Dad: They drive bigger and bigger trucks over the bridge until it breaks. Then they weigh the

       last truck and rebuild the bridge.  

   

   

Tim Dawson-Townsend  

40025  

   

tdt(at)aurora.aero (tdt(at)aurora.aero)   

617-500-4812 (office)  

617-905-4800 (mobile)  

   

      [quote][b]

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steveadams

Joined: 10 Jan 2006
Posts: 191

Posted: Fri Feb 15, 2008 6:58 am Post subject: Re: V Speeds

I agree you don't want to exceed the design envelope for the plane, but it seems to me you need to verify the V speeds you can during phase 1. If you are afraid to test up to design Vne, your Vne should be set at the fastest speed you are willing to test. Maybe I'm just weird, but to me phase 1 is a test period, not a "flyoff", so explore the whole flight envelope before you start filling up the other seats.

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rv10builder(at)verizon.ne
Guest

Posted: Mon Feb 18, 2008 8:59 pm Post subject: V Speeds

To each their own, but I agree with you Steve, my goal during those first 

few hours with the plane will not be to do sight seeing but to verify if 

Van's numbers match mine. I'll do some stalls with and without flaps and get 

the basic information, if they match Van's numbers.. than by gee whiz I'll 

take their VNE numbers for what they are.. I am mostly concerned with the 

speeds I'll be using for landing and cruising, VNE is not something I care 

to "test" and Van's already did all that for me. If my numbers dont match, 

well than I'll work that out during the remaining test flights..



Pascal

RV-10 future test pilot

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orchidman

Joined: 10 Jul 2006
Posts: 277
Location: Oklahoma City - KRCE

Posted: Tue Feb 19, 2008 5:15 am Post subject: Re: V Speeds

You can also check out the FAA's AC 90-89A amateur-Built aircraft and Ultralight flight Testing Handbook.  I have been doing some light reading lately and went through it.  It details all the procedures for the different speeds and the recommended sequence to do them in.

It is outdated as far as glass and a little bit must be taken with a grain of salt, it is generically written, but it has helped me get a clearer picture of the sequencing of test procedures.

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_________________
Gary Blankenbiller
RV10 - # 40674
(N2GB Flying)

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