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Old 06-06-2021, 07:27 PM
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blackshire blackshire is offline
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Join Date: Jan 2009
Location: Fairbanks, Alaska
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Default Big Bertha *scale* B/G kit-bash subject!

Hello All,

Here is an unusual, *scale* boost-glider kit-bash subject that can be made from the Estes Big Bertha kit:

ISRO, the Indian Space Research Organisation, is very interested in developing its own reusable launch vehicles (incidentally, this [see: https://www.isro.gov.in/launcher/rlv-td and https://www.isro.gov.in/launchers/r...r-rlv-td-images ] suborbital test vehicle, the RLV-TD (Reusable Launch Vehicle - Technology Demonstrator), is also a nice scale boost-glider subject), and:

ISRO envisions *this* TSTO RLV (Two-Stage-To-Orbit Reusable Launch Vehicle, see: https://forum.nasaspaceflight.com/i...p?topic=24883.0 , https://medium.com/@rsn/spacex-falc...le-c52d4d56f87d , and https://www.google.com/search?q=isr...iw=1440&bih=789 ), which has a winged first stage and a parachute/thrusters/airbags-recovered second stage. I have also attached computer-generated drawings of the TSTO RLV (the complete vehicle, and its two separated stages) below--plus:

Peter Alway points out in his 1994 book, “The Art of Scale Model Rocketry” (it is online here: https://nar.org/free-reports/Art%20...r%2 0Alway.pdf ), a way to get around shortages of scale data (and that even museum scale model makers are not uncommonly forced to create their display models from incomplete and even inaccurate scale data), so they do it with the help of photographs. On page 13 of the book (it’s page 15 in the online PDF scan), he explains how—with the help of known length and width figures (any other known detail dimensions also help, but are not essential)—to establish two scales, vertical and horizontal, that account for foreshortening in photographs and enable other dimensions to be measured directly off photographs.

I hope this information will be helpful.
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