Conference vmszoo::rc

    This note has been here a while with no response, I assume that means
    nobody here has one.  Too bad because I was curious to find out
    exactly what it did myself.  I saw someone almost crash a plane trying
    one out but never found out exactly what it did.
    	If I was to guess I would say it gives you full rudder and elevator
    (that's how I do snap rolls) for a certain time period, and I would
    expect the time period to be adjustable with a pot so you can get level
    flight after the snap.  That's how I would do a "snap roll button",
    but it seems kind of silly because the snap roll is a fairly simple
    maneuver with the right type of airplane.  Now if they had a lomcevak
    button...
							Bill
 

Well Bill I am like you I have a Snap roll button and all sorts of other crap
on my JR PCM 9 I have never used (Never felt the urge to snap roll a FAI Pylon
model at 150mph+). Admittedly I only fly Pylon now and only use 4 channels but 
had to buy a 9 channel radio to get the quality and besides they made me an 
offer I could not refuse.

I concur with your interpretation of its use but I dont think there are any 
timing circuits. I imagine a Pattern flier Like Tom T could enlighten us as 
those guys do crazy maneuvers like "Avalanche" etc. that require precise snap 
rolls. Excuse the cynicism of a reformed Pattern flier.

John.

    What exactly is a "snap roll"?  What does the  plane do?  And could
    you snap a wing on that maneuver?
    
    Ken

    Re .3
    The snap roll is a fairly violent maneuver, but whether it could
    snap a wing depends on how well the plane was built.  Always glass
    the center section of the wing, especially if you plan to do
    pattern flying.
    	The manuever itself is done by getting the plane in a nose-high
    attitude with elevator, than "snap" it around with rudder.  The
    plane rolls about its axis while maintaining a nose-high attitude.
    Unlike most other rolls aileron is not used for this maneuver.
    	In general a nose-heavy plane will not snap-roll well.  But before
    you go adding weight to your tail remember that a tail-heavy plane
    can be very unstable and can stall violently.  A beginner should
    avoid tail-heavy conditions.
    	I have a little Super Sportster .20 that snaps well with
    CG according to plan.  My friends joke that I should have painted
    some vomit in front of the little pilot for realism based on the
    way I fly.
    
    Re .2
    	That Pylon stuff sounds like fun but I'd like to learn pattern
    at the moment.  I've got the basic maneuvers down such as
    inside/outside loops, inverted flight, rolls, snaps, spins, stall
    turns, etc.  I've had trouble with knife-edge as the Sporster doesn't
    seem to have quite enough engine to keep it up, even with full rudder.
    I expect the CAP 21 when finished to do the trick.
    	If we had enough experienced pattern people maybe they could
    explain general stick movements for different maneuvers.  I'm sure
    there are a lot of people interested in improving their pattern
    skills (like me!).  Did we ever get a note started for that kind
    of thing?
    							Bill
    

    I have a snap roll button on my Futaba 7UAP.  It's actually a large
    switch on top of the radio where you can get at it easily with your
    index finger.  On my radio there are also four different settings that
    you can set for this switch and select them from the front panel.  You
    can program in any combination of rudder, elevator, and aileron in any
    direction you choose.
    
    The term "snap roll" really doesn't fully describe what the switch has
    become now that radios are computerized.  You can program it as a slow
    roll switch, an inverted snap roll switch, etc.  You can also use it 
    for spins.
    
    I have talked to other people about using the switch since I was
    worried about learning to rely on it too much.  One guy had this really
    hot bipe that he used to pull into a stall about 20 ft. up and hit the
    throttle and the snap roll switch to do a couple of quick ones while
    he was standing still.  The snap roll switch overrides your dual rates,
    otherwise a move like that would not be possible.
    
    What's a Lemcevak (sp?).
    
    -- Les Walker