REFLECTOR: Cruise speed "speed brake" & Glass O'cast

Tue Sep 6 12:08:32 CDT 2005

Incrementally extending...

I was just thinking about this on your first post.

It seems it would be quite simple to add a force actuated switch that 
would not exceed some limit.

I do not remember what the current actuators are rated for, but let's 
assume they are 100lbs.

Make a collar that fits around the keel end of the actuator, with a 
spring with the appropriate K factor to move .25 inches when 75lbs is 
applied.  Put a switch in series with the actuator, with a diode so that 
the switch is bypassed if you want to retract while the cutout switch is 
engaged.  Normal operation would bypass the diode (no voltage drop), 
when the cutout switch is not engaged.

Want to go down? just flip the switch to extend the board, and let the 
cutout switch decide when to extend it some more.  Just don't exceed the 
limits by increasing your airspeed.

I suppose one could get fancier with a DPDT switch that would retract it 
if the forces get too high, but I haven't put enough brain cells into 
that problem.

Scott Derrick wrote:
> I would hate to give up my separate rudder controls and yes they do act 
> as a speed break, but fairly weak compared to the belly board and a 
> major PITA to use on an extended cruise descent.
> 
> I want something I can turn on and basically fly the airplane in a 
> normal manner, except for the fact I'm able to descend fairly quickly 
> under power.
> 
> Beefing up the belly board really seems to me to be the best option.  
> Possibly adding controls to be able to incrementally extend it at preset 
> points.
> Scott
> 
> 
> Terry Miles wrote:
> 
>> I'm not flying yet, but I understand that (both rudders at once) feature
>> is not on later versions of the Velocity.
>> New topic:  Rich, thanks for the pics of Oshkosh.
>> Terry
>>
>> -----Original Message-----
>> From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
>> Behalf Of Kufalk
>> Sent: Monday, September 05, 2005 4:18 PM
>> To: Velocity Aircraft Owners and Builders list
>> Subject: Re: REFLECTOR: Cruise speed "speed brake"
>>
>>
>> Terry wrote...   "Another thought only, how about a split rudder like
>> the
>> B-727."
>>
>>
>> Don't all canard pushers already have split rudders?
>>
>> If you want to slow down from cruise speed without reducing power, why
>> not just press both rudders at the same time?
>>
>> Darrell
>>
>>
>>
>> ----- Original Message ----- From: "Terry Miles" 
>> <terrence_miles at hotmail.com>
>> To: "'Velocity Aircraft Owners and Builders list'" <reflector at tvbf.org>
>> Sent: Monday, September 05, 2005 6:32 AM
>> Subject: RE: REFLECTOR: Cruise speed "speed brake"
>>
>>
>>  
>>
>>> Chuck,
>>>
>>> You can add me to the list of interested parties.  Here is all I have.
>>> In a brief and non-technical exchange w/ Scott Baker on this topic 
>>> back about 6 months ago, comments expressed at that time were that 
>>> there was a general safety concern about the panel coming off at 
>>> higher airloads and going into the prop.  So a conservative speed 
>>> limit was established and no testing was done above that speed.  And
>>>   
>>
>> further there was no
>>  
>>
>>> interest in incremental deployment angles.   Another thought only, how
>>> about a split rudder like the B-727.  Only this one would split and 
>>> the low half both LH and RH would deflect into the slip stream.  The 
>>> problem solved is not it out of the prop track, but the problem 
>>> created is the deflection is way to far from centerline in the event 
>>> of assym deployment malfunctions.  Good luck with this.  Keep us posted.
>>>
>>> Terry
>>> XL-RG with a SB
>>>
>>> -----Original Message-----
>>> From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org]
>>> On Behalf Of Chuck Harbert
>>> Sent: Monday, September 05, 2005 3:54 AM
>>> To: reflector at tvbf.org
>>> Subject: REFLECTOR: Cruise speed "speed brake"
>>>
>>>
>>> Scott, I too have wondered if there was a way to install a high speed
>>> speed brake like the one on the Mooney 201 that pops up on the upper 
>>> surface of
>>> the wing to kill the lift. It was great to get down in a hurry without
>>> puting the engine at idle. I wondered if you could install this
>>> electrically
>>> activated "fence" at the outboard edge of the strake in the wing bolt
>>> cavity, or inside the wing attached to the spar? They're not that
>>>   
>>
>> large
>>  
>>
>>> as I
>>> recall. They fail safe in the down position and have a warning light
>>> when
>>> deployed, as I recall.
>>>
>>> I think that this might be a better way because it kills lift, rather
>>> than just dirtying up the plane, and possibly making it unstable. I 
>>> have the underbelly speed brake in my RG and it definetely works well 
>>> for landing,
>>> but I'd love to have a real speed brake. I'll try to get a look at the
>>> Mooney's speed brake and send everybody the info.
>>>
>>> Chuck H
>>>
>>>
>>> -------------------------
>>> Scott Derrick wrote:
>>>
>>>   
>>>
>>>> I think the standard speed brake is limited to 120 knot extension
>>>> speed.  Which limits its uses to in the pattern.
>>>>
>>>> Has anybody experimented with beefing it up to allow higher speed
>>>> extensions?  Like 175 knots?  This would make it a true speed brake.
>>>>
>>>> I would like something I could deploy at cruise to enable a cruise
>>>> speed descent without shock cooling the engine.
>>>>
>>>> What would you think would be needed to do this?  bigger hinges?
>>>> bigger actuator?  carbon fiber door?
>>>>     
>>>
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>>  
>>
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