REFLECTOR: Vne for V

[Scott Derrick]

Chuck,

I had a self induced flutter problem a couple of year ago. 

Once I corrected it( or at least thought I had)  I tested my plane to 
210 KIAS. I figured I should test to 10 knots above the posted limit for 
a safety buffer. It was solid as rock, whacking the stick  left and 
right, forward and back, jabbing the rudders.  No vibration.  Way cool!!

I think I remember Scott B. saying and I may be wrong,  that the 
Velocity had been tested to a Vne of 200 KIAS.  Which begs the question 
of what is its theoretical design Vne. 

Once I'm back in the air I plan on testing mine to 240 KIAS. 5 knots at 
a time.

Scott

Chuck Harbert wrote:
> Len, the way I think about this is to get high ground speed is carry hp to 
> altitude. Going fast at low altitudes uses lots of hp and fuel. The 
> indicated airspeed IAS is a measure of the air pressure on the airframe 
> which is creating the drag. As you go higher where there is less air 
> pressure, your airspeed indicator will show a lower IAS, but you ground 
> speed will be the same as at lower altitudes (assuming all things equal). 
> Thus, if you can maintain 200 kts indicated a 10K', you'll actually be doing 
> well over 200 kts ground speed. Most airspeed indicators have a speed 
> correction insert showing the true airspeed corrected for altitude and temp. 
> on the face.
>
> This is why people use larger hp engines or turbocharging to carry more hp 
> to the upper altitudes. You can exceed 200kts by huge amounts and not 
> overstress the plane. A jet airline pilot told me that a 36K ' the plane was 
> doing close to 500 mph ground speed, but his airspeed indicator only showed 
> 265kts. I think he told me the Vne on the plane was around 300 kts.
>
> Because we build our own planes, I think the factory says Vne is 200kts 
> assuming a safety factor adequate to cover well built (and not so well built 
> planes). Dwayne actually told me the story of the guy who rolled out into a 
> dive and his GPS said that the plane had gone 272 kts (small cracking behind 
> the canard), but all this indicates is that under these unique 
> circumstances, the plane didn't come apart.
>
> I hired a test pilot to do my first Vne test, so I know my plane can handle 
> it. I just never want to know what flutter feels like. That's just me, but I 
> also would like to know if others have had experience a IAS above 200kts.
>
> Chuck H
>
> Len Baxter wrote:
>
>   
>>> I thought the Velocity was limited to approx 200 kn (indicated).........
>>> It seems to me that you and Pat must be exceeding that limit.  As a
>>> "newbee" I would like to learn what is needed to expand the upper limit
>>> beyond 200kn ( other than more power)
>>>
>>> thanks
>>> Len Baxter 
>>>       
>
>
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