Ex Motor Question

[rdbones]

I am just getting in to the world of EX and making my own motors. I have been conversing with some and have gathered some known and proven formula's.

My question is, all of the formulas that I have call for R45M (HTPB). I am wondering if R45HTLO can be substituted and if so, is the ratio the same?

 

[WillMarchant]

Hi Roy:
Research motors aren't really something we cover here at TRF. You might want to try one of the other forums like https://forums.rocketshoppe.com/
Best wishes for the New Year,
Will

 

[ben_ullman]

I am just getting in to the world of EX and making my own motors. I have been conversing with some and have gathered some known and proven formula's.

My question is, all of the formulas that I have call for R45M (HTPB). I am wondering if R45HTLO can be substituted and if so, is the ratio the same?

While I know the policy I believe every question should be answered! You need to know the equievelent weights of each to determine the ratio.

Ben

 

[SCE to AUX]

And YORF really isn't a great place for EX discussion, either (they focus more on vintage LPR).

Sites that aren't scared of EX include Rocketry Planet:

https://www.rocketryplanet.com/forums/

and Newton's 3rd forums:

https://forums.newtons3rdrocketry.com/

 

[jsdemar]

I am just getting in to the world of EX and making my own motors. I have been conversing with some and have gathered some known and proven formula's.

My question is, all of the formulas that I have call for R45M (HTPB). I am wondering if R45HTLO can be substituted and if so, is the ratio the same?

https://thrustgear.com/docs/Curative_calculation.pdf

 

[troj]

Actually that question is well within this forum's policies!

Thanks for posting the calculator link, John.

-Kevun

 

[rdbones]

John - Thanks for the calculator, the information contained there will be a great help!

 

[jsdemar]

John - Thanks for the calculator, the information contained there will be a great help!

You're welcome! Curative calcs can be pretty confusing at the beginning. Here's a little spreadsheet that you might find useful:
https://thrustgear.com/docs/bindercalc.xls

Another common question is "what about the equivalent weight of DOA or other plasticizers"? They don't interact with the curative, so the plasticizer is not included in the curative calculation.

If you have specific questions about formulas and processes, you can ask over on RP or TQC.

 

[jsdemar]

There's an update to my Binder Calc spreadsheet here: https://spaceportservices.com/Tools/BinderCalc5.xlsx

If you do not have Excel, the spreadsheet works in the free LibreOffice Calc program:
https://www.libreoffice.org/