> Does anyone know if this can be flown with either:
> A) A pair of 24mm reloadables
> B) A single larger (29mm?) motor
I'd have to recommend against the two-motor configuration in any SR-71
-- at least if you're planning to mount the motors in the scale jet
engine nacelles. Putting the thrust lines that far off the center line
is a Very Bad Thing; the slightest dely in ignition of one motor will
lead to a unbalanced thrust throughout the flight (most reloads have a
slightly regressive thrust curve, so the motor that ignited first will
have less thrust than the late one), probably resulting in a power
prang. That problem is made worse by the fact that the Hobby Lobby
glider doesn't have rudder control, so you have no way to compensate
during boost for the unbalanced thrust, even if your reflexes and flying
skills are up to the challenge (and they probably aren't, unless you've
got dozens of hours of stick time, at a minimum).
The single 29mm motor might be made to work, providing you rebalanced
the glider (to keep the same glide and boost CG locations with the
heavier motor), and stick to low-thrust motors like the F12 and E16.
To be honest, from what I've read (I've never seen one fly), the Hobby
Lobby SR-71 appears to be a grossly overpriced and underengineered
travesty. You'd be much better off (IMO) using standard model airplane
techniques to build a frame-and-skin model of the same subject; you'd
get a final result that wouldn't be much (if any) heavier, but would be
a great deal more durable and likely less prone to creating its own
disasters. You might even find it flew well enough to operate as a
rocket glider, instead of ejecting an internal pod as the Hobby Lobby
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Donald Qualls, aka The Silent Observer NAR # 70141-SR Insured
Rocket Pages http://members.aol.com/silntobsvr/launches.htm
Opinions expressed are my own -- take them for what they're worth
and don't expect them to be perfect.