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-   -   It=2.72N-s Fav=1.52N tb=1.75s (http://www.oldrocketforum.com/showthread.php?t=5218)

Carl@Semroc 05-03-2009 09:02 PM

It=2.72N-s Fav=1.52N tb=1.75s
 
1 Attachment(s)
Those are the results from the second prototype A1.5-0 10mm engine! A little too hot for an A, but that was improved with third which was 2.50N 1.51N and 1.66s. There still is .6" left over in the tube for delay and EC. That will probably limit a full A to about 6 seconds max.

The thin wall cases do hold up. I was afraid that since they are about .050", they would cato or burn-through. So far, all the tests are positive.

An old Estes A8-3 on the stand was 2.2N-s with a .52s burn.

There is still a lot of work to do!

Royatl 05-03-2009 09:20 PM

Quote:
Originally Posted by Carl@Semroc
The thin wall cases do hold up. I was afraid that since they are about .050", they would cato or burn-through. So far, all the tests are positive.

An old Estes A8-3 on the stand was 2.2N-s with a .52s burn.

There is still a lot of work to do!



Were these made by a machine or were they hand loaded?

Carl@Semroc 05-03-2009 09:25 PM

Quote:
Originally Posted by Royatl
Were these made by a machine or were they hand loaded?
By hand with parts that will be used on the machine.

The 10mm and 13mm will be done on a different machine than the 18mm engines.

Doug Sams 05-03-2009 09:52 PM

Quote:
Originally Posted by Carl@Semroc
A1.5-0 10mm engine!
Put me down for a 12 pack :D

Seriously, I guess the case dimensions dictate other dimensions such as nozzle opening and burning surface area such that when it's all said and done, 10mm motors tend to all have the thrust curve Carl attached. I say (ask) that because the curve looks very much like the old Apogee micro motor curves.

Doug

.

Carl@Semroc 05-03-2009 09:59 PM

Quote:
Originally Posted by Doug Sams
Put me down for a 12 pack :D

Seriously, I guess the case dimensions dictate other dimensions such as nozzle opening and burning surface area such that when it's all said and done, 10mm motors tend to all have the thrust curve Carl attached. I say (ask) that because the curve looks very much like the old Apogee micro motor curves.

Doug

.
That is exactly right. I would be surprised if they were much different.

A Fish Named Wallyum 05-03-2009 10:12 PM

Too kewl! :cool:

Initiator001 05-03-2009 11:11 PM

Great news, Carl!

Please be sure to get your motors California certified so I can fly them. ;)

Bob

foose4string 05-04-2009 07:57 AM

Very cool.

I have a generic question relating to your motors(this may have been discussed already-not sure).... what is the process for making the nozzles and how are were they made for the prototypes? This question has nothing to do with the prototype test results, I'm just curious how certain aspects of the motors are(or will be) manufactured since I don't know much about the process.

Eagle3 05-04-2009 08:14 AM

That would make a very nice boost glider motor. :) Thanks for the update Carl!

Chas Russell 05-04-2009 08:30 AM

I like it! So will the rest of the community, especially NAR and International competitors!

Please sir, we want more! :D

Chas


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