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Originally Posted by Gus
Seller took the link down until he checks on the shipping regulations.
Seems like a very nice fellow who was unaware of any restrictions on shipping motors less than 60 grams.
I'm trying to provide him some Canadian shipping resources.
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Thank you for doing this, Gus. Recently, I've been looking longingly at my tiny stash of Dr. Z-made Rapier jet motors, hoping that another supplier of these Jetex-type (by function, and low thrust vs. long burn time) model aircraft motors will come along; if Hummingbird plays its cards right, it sounds like the new supplier! Also:
In addition to powering F/F model jets (mounted in bypass ducts, as was/is often the case with Jetex models, with basic operation not unlike that of turbofan engines, in order to [1] increase the thrust, [2] lower the aggregate jet efflux velocity to better match the models' typical flight speeds [by moving more fluid, but more slowly], and [3] to cool the jet efflux), these low-thrust/long-burn jet motors can also operate in "pure rocket mode," via the following means:
The Walter rocket engines that were being developed for the later Messerschmitt Me 163 Komet rocket interceptors had two chambers (see:
https://en.wikipedia.org/wiki/Messe...tt_Me_163_Komet ). The larger chamber was used for takeoff and climb, while the smaller chamber maintained the aircraft's high speed in level and/or much less steeply-climbing flight, at altitude, thus increasing the Komet's powered flight time over that of the single-chambered rocket engine-powered Komet variants.
ALSO:
The Beechcraft AQM-37 Jayhawk target drone (see:
https://en.wikipedia.org/wiki/Beech..._Jayhawk#AQM-37 , and
http://www.designation-systems.net/dusrm/m-37.html ) also uses a two-chambered rocket engine (with a larger "boost" [accelerate] chamber, and a smaller "sustain" one), for much the same purposes the later two-chambered Walter rocket engines were to be used in the later Me 163 Komet interceptors. Firing both AQM-37 rocket engine chambers at once--and keeping both firing--provides faster, but shorter-duration, drone target presentation flights; firing both chambers at first, then soon shutting down the "boost" chamber, enables somewhat slower, but significantly longer-duration, drone target presentation missions. This allows more missile and gunnery practice--even by multiple crews in different locations--to be carried out against a single AQM-37. As well:
F/F scale models of the later Me 163 Komet variants--*and* of the various AQM-37 versions--could use the Jetex, Rapier, or Hummingbird jet motors in the "sustain" mode ("pure rocket mode," in non-bypass duct mounts), operating as true rocket planes. This could also be done with F/F scale models of the Northrop MX-324 (a rocket-powered flying wing glider, see:
http://www.unicraft.biz/on/mx324/mx324.htm , and
http://all-aero.com/index.php/53-pl...-mx-324--mx-334 ), the U.S. M2-F3, HL-10, and X-24A/B lifting bodies, and the X-1, X-1A/B/C/D, X-1E, and X-2 rocket planes, etc. (Where needed, a flat metal strip "jetavator" behind the motor nozzle could maintain level flight under rocket power [this was done with a non-scale, late-1940s rocket plane model kit that used a fuse-ignited, skyrocket-type proprietary black powder motor], until the consumption of the propellant moves the model's CG forward, for a good glide).