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Re: Europa-List: Are Vne and Va IAS or TAS?

Subject: Re: Europa-List: Are Vne and Va IAS or TAS?
From: Bud Yerly <budyerly@msn.com>
Date: Thu, 11 Jan 2018 14:29:49
Pete,
Quick answer:
During prop testing, I would do cruise tests up to 15k, then dive at Vne in
 smooth air to the turbulent layer at 5000, then slow to below 130 of cours
e.   No issues.  (Did a loop at 160 just for practice.)  Later to determine
 prop pitch to hold 5000 and 5500 rpm, I shallow dived to Vne and observed 
the rpm, landed, adjusted the prop course stop, and repeated.
The pitch and roll forces are a bit lighter at Vne, but still delightful.

Now you know why I'm a zealot about stab tightness, and flutter.  I do this
 type of testing on my new 914 / Airmaster powered planes I flight test.

By the way, in my last post, I didn't include wing flap vs local AOA change
 resonance at high altitude in flexible wings of low elastic modulus.  Nast
y stuff, and very lengthy to explain.

Keep it tight.

Regards,
Bud

Bud Yerly
Custom Flight Creations


From: Pete
Sent: Wednesday, January 10, 7:01 PM
Subject: Re: Europa-List: Are Vne and Va IAS or TAS?


Hi Bud,

Many thanks for your (as always) comprehensive post. Very much appreciated.
  Your bolded statement implies that the Europa would be fine to be flown t
o VNE IAS at 15-18k (altitudes used by some Europa fliers) without risk of 
flutter due to the relatively stiff construction (if I have not mis-read). 
 I'm quite hesitant to ever give that a try, but was searching for the comf
ortable TAS limits instead... which Ivan has appeared to answer with his pr
oven test numbers.

Now im wondering if any Europa fliers have become test pilots and flown at 
VNE IAS higher than Ivan's 8000' during his Vd testing?

Just recently, another composite light sport didnt fare as well:
https://www.flyingmag.com/technique/proficiency/technicalities-are-you-feel
ing-lucky<https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F
%2Fwww.flyingmag.com%2Ftechnique%2Fproficiency%2Ftechnicalities-are-you-fee
ling-lucky&data=02%7C01%7C%7C4806ff4b8a944b1ca90208d558867988%7C84df9e7fe
9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636512256952691615&sdata=r6v3ZE7X3X9wsg
TXWlnMABwg1fzm4Ym%2FIbzzdeuWjL8%3D&reserved=0>

Cheers and blue skies,
Pete :)

On Jan 10, 2018, at 4:15 PM, Bud Yerly <budyerly<mailto:budyerly@msn.com>@m
sn.com<mailto:budyerly@msn.com>> wrote:

p



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