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Old 03-23-2018, 09:10 PM
teflonrocketry1's Avatar
teflonrocketry1 teflonrocketry1 is offline
Intermediate Rocketeer
Join Date: Aug 2007
Location: Whitehouse, Ohio
Posts: 39


I liked watching the one backwards loop this model makes before it stalls and hits the ground. My brothers put a C motor in the original kit I built while I was away at school and didn't find/recover it.
Bruce S. Levison, NAR #69055
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Old 03-31-2018, 05:57 PM
blackshire's Avatar
blackshire blackshire is offline
Master Modeler
Join Date: Jan 2009
Location: Fairbanks, Alaska
Posts: 5,478

Originally Posted by the mole
If I'm not mistaken eRocket is working on making a kit of this glider.
I certainly hope so! If answering this wouldn't betray any confidences, will it be a true "Repro-Retro" kit that uses the #7 (ST-7, 0.759" Outside Diameter) Centuri tubing and a balsa duplicate of the Centuri PNC-70 nose cone? Such a kit could use not only 18 mm motors, but also 13 mm mini motors (in a streamer-recovered motor adapter mount). Also:

It might be possible to minimize or even eliminate the backward loop (which occurs under power, after launch) by using a 13 mm motor adapter mount whose #5/BT-5 mini motor mount tube is located off-center by using suitably-punched (or laser-cut) flat fiber centering discs. (The rear-ejected, streamer-recovered motor mount of the Centuri Space Shuttle kit [it can be seen here: ] had such an off-center motor mount tube.) Installing such a 13 mm motor adapter mount in the Hummingbird with the motor mount tube on the "bottom" would lower the motor's thrust line (the adapter discs could even have their motor mount tube holes arranged to give a slightly "pitch down" thrust vector, if desired) and could prevent the backward loop under power (the Jetex, Jet-X, and Rapier model jets used/use similar thrust line pointing for the same reason).
Black Shire--Draft horse in human form, model rocketeer, occasional mystic, and writer, see:
All of my book proceeds go to the Northcote Heavy Horse Centre
NAR #54895 SR
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