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Old 11-10-2017, 10:15 PM
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blackshire blackshire is offline
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Quote:
Originally Posted by PeterAlway
I didn't comment on this last time, because I wanted to confirm my recollections of some measurements I made of the Titan III C kit a few weeks ago. The MPC kit is undersized by something on the order of 10%-20%. For instance, the boosters, which should be 1.22" in diameter, are about 1.0" in diameter. The core, which should be 1.2" in diameter, is about 1.1" in diameter. The lengths are shorter vaguely in proportion (I haven't specifically measured).

The inside diameter of the core section is about 1.05" in diameter, while two BT-5 tubes would require 2 x 0.541" = 1.82" of space. you'd have to carve away at the paper or the plastic to get that to work, and canting them outward is right out.

All in all, I think it would be about as easy to scratchbuild a flying Titan III A based on Gemini-Titan II plans and a custom conical nosecone.

Peter Alway
I sure wouldn't want to try flying a scale Titan IIIA (using the core vehicle from the MPC Titan IIIC) using two Quest MicroMaxx motors, even though *their* motor mount tubes would fit. :-) Wow--I knew that MPC's regular-construction model rockets (like their 15 mm diameter Miniroc kits) often had "nominal" dimensions (integer-length body tubes--say, an 8" tube--were not uncommonly about 1/4" off), but I never suspected that their plastic ones (they were mainly a plastic model kit manufacturer, after all) were that far off-scale-size! Thank you for letting us know about these size discrepancies (I have two MPC Titan IIIC [and two MPC Vostok/Sputnik] kits, but I haven't built them yet).
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