REFLECTOR: V-SPEEDS

jack davis n767sd at hotmail.com
Mon Jul 19 19:19:43 CDT 2004


Perhaps I missed something, but I thought the Velocity is rated at much more
than 4Gs.

Jack
----- Original Message ----- 
From: "Jim Sower" <canarder at frontiernet.net>
To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
Sent: Sunday, July 18, 2004 9:55 PM
Subject: Re: REFLECTOR: V-SPEEDS


> <...  maximum structural cruising speed ...>
> Are you talking about Vmax or "Maneuvering speed"? Vmax can be pretty
> arbitrary - the speed at which the designer assures us we won't come to
> pieces from flutter or something. Maneuvering speed would be at around
> 140 kts. Maneuvering speed (known in some circles as T-Storm penetration
> speed) is IIRC the highest speed at which you can't over stress the
> airplane. Basically, it's the stall speed multiplied by the square root
> of the G rating of the airplane. For a Velocity rated at 4 Gs, it's
> twice stall speed, or about 130-140 kts. At or below that speed, you
> can't bend the airplane. You stall before you exceed rated Gs.
> As best I recall from aerodynamics 101 ... Jim S.
>
>
> jack davis wrote:
>
> > Hi Ronnie,
> > Actually, if you talk to the factory they will tell you that the Va
> > speed was arbitrarily chosen and has nothing to do with structural
> > issues of the control surfaces. Although I would agree with you that
> > it is somewhat smoother at 140 knots than 170 knots when in
> > turbulence, it really isn't bad at all in a Velocity. I've done it
> > many times while flying IFR. My green arc goes from 65 to 180.
> > Happy flying . . .
> > Jack
> >
> >     ----- Original Message -----
> >     *From:* Ronnie Brown <mailto:romott at adelphia.net>
> >     *To:* Velocity Aircraft Owners and Builders list
> >     <mailto:reflector at tvbf.org>
> >     *Sent:* Saturday, July 17, 2004 4:34 PM
> >     *Subject:* Re: REFLECTOR: V-SPEEDS
> >
> >     Jack, the green arc is from the minimum clean speed to the maximum
> >     structural cruising speed. The 170 knots would get pretty bone
> >     jarring in heavy turbulence. The maximum structural cruising speed
> >     is the maximum airspeed in smooth air. Also, the plane should be
> >     able to withstand vertical gusts above 30 kts without sustaining
> >     airframe damage.
> >     So I think my markings are correct. Of course I didn't do any
> >     testing to verify this!
> >     Ronnie
> >
> >         ----- Original Message -----
> >         *From:* jack davis <mailto:n767sd at hotmail.com>
> >         *To:* Velocity Aircraft Owners and Builders list
> >         <mailto:reflector at tvbf.org>
> >         *Sent:* Saturday, July 17, 2004 2:22 PM
> >         *Subject:* Re: REFLECTOR: V-SPEEDS
> >
> >         Only one comment on Ronnie's V speeds. I believe the factory
> >         indicated that they shipped airspeed indicators in the past
> >         with incorrect labeling. The Green Arc should go from 65 to
> >         170 Knots. At least on the Standard wing you will typically be
> >         indicating 160 knots at 75% power.
> >         Jack
> >
> >             ----- Original Message -----
> >             *From:* Tom Martino <mailto:tmartino at troubleshooter.com>
> >             *To:* Velocity Aircraft Owners and Builders list
> >             <mailto:reflector at tvbf.org>
> >             *Sent:* Friday, July 16, 2004 4:45 PM
> >             *Subject:* RE: REFLECTOR: V-SPEEDS
> >
> >             Thanks Ronnie! Were these derived from your flying
> >             experience? Or do you have a flight manual from somewhere?
> >
> >             -----Original Message-----
> >             *From:* Ronnie Brown [mailto:romott at adelphia.net]
> >             *Sent:* Friday, July 16, 2004 2:14 PM
> >             *To:* Velocity Aircraft Owners and Builders list
> >             *Subject:* Re: REFLECTOR: V-SPEEDS
> >
> >             For my 173 Elite RG:
> >
> >
> >               *Airspeed Limitations*
> >
> >             VNE – Never Exceed Speed 200 knots
> >
> >             VNO – Maximum Structural Cruising Speed 140 knots
> >
> >             VLE – Maximum Landing Gear Extension Speed 120 kts
> >
> >             VFE – Maximum Speed Brake Extended Speed 110 kts
> >
> >
> >               *Airspeed Indicator Markings*
> >
> >             White Arc – Speed brake operating range 65-110 kts
> >
> >             Green Arc – Normal Operating Range 65-140 kts
> >
> >             Yellow Arc – Operations must be conducted with caution and
> >             only in smooth air 140-200 kts
> >
> >             Red Line – Maximum speed for all operations 200 knots
> >
> >                 ----- Original Message -----
> >
> >                 *From:* Tom Martino <mailto:tmartino at troubleshooter.com>
> >
> >                 *To:* reflector at www.tvbf.org
> >                 <mailto:reflector at www.tvbf.org>
> >
> >                 *Sent:* Friday, July 16, 2004 3:33 PM
> >
> >                 *Subject:* REFLECTOR: V-SPEEDS
> >
> >                 I have to calibrate my airspeed indicator (on an EFIS
> >                 system) ... is there an official flight manual for the
> >                 Velocity with such speeds for various models? I
> >                 realize each plane will be slightly different ... but
> >                 I simply want a starting point. Where can I find those
> >                 numbers?
> >
>
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>
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