REFLECTOR: Speed brake usage question

David Scharfenberg dave at winco.net
Tue Nov 9 23:20:45 CST 2004


Scott,

   What limits the speed brake extension to 110 kts?  What would be the
speed limitation for a partial extension, say 50%?

Thanks,

Dave Scharfenberg


 on 11/8/04 6:43 PM, Scott Baker at sbakr at comcast.net wrote:

> Velocity's main concern is the potential for the gear doors to depart and
> fly into the propeller.  Unofficially, we have been using a V-gear down
> speed of 130knots on RG models; 125knots extension speed.  RG models, with
> the gear doors removed, can be flown to Vne.
> SB
> 
> ----- Original Message -----
> From: "Scott Derrick" <scott at tnstaafl.net>
> To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
> Sent: Monday, November 08, 2004 12:45 PM
> Subject: Re: REFLECTOR: Speed brake usage question
> 
> 
>> I wonder what the factory says about increasing the extension speed to 160
>> kias???  Is it really strong enough for continuos usage at that speed?
>> 
>> That would make the brake a much more versatile tool.
>> 
>> My fear is it eventually coming off, right into the prop!
>> 
>> Scott
>> 
>> At 07:44 AM 11/8/2004, you wrote:
>>> Dave,
>>> 
>>> I've already done the test for you.  One time at 160 IAS I hit a good
>>> bump that bumped my head on the ceiling.  My shin bumped several toggle
>>> switches located at the bottom of the panel (not the best place for the
>>> switches), including the speed brake switch.  At first I couldn't figure
>>> out why I lost 25kn of airspeed until I saw a few indicator lights on.
>>> The brake still works fine with no damage.
>>> 
>>> John
>>> SGRE
>>> 
>>> David Scharfenberg wrote:
>>> 
>>>> The maximum airspeed for speed brake extension is 110, which is less
>>>> than the gear speed.  On other planes I fly, the speed brakes can be
>>>> deployed at any speed.  This helps on a quick decent and helps bleed
>>>> off speed for gear extension.  I have been wondering if the airspeed
>>>> for partial speed brake extension would be more than the current 110
>>>> limit.  This would make the speed brake more useful.  Of course I know
>>>> who sets the actual limit on my plane, but  don't really want damage
>>>> it doing the airspeed tests.
>>>> 
>>>> 
>>>> Dave Scharfenberg
>>>> std/RG
>>> 
>>> 
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>> 
>> 
>> "Those who sacrifice freedom to get security, deserve neither."
>> - Benjamin Franklin
>> 
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> 
> 
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