I195J Thrust Curves

[jmasterj]

Thanks Gary !

If I am not mistaken, that is the one I attached to post #4 that came from Sue / TMT in Sep 1999

-- kjh

Yep, looks like that one too.

 

[cls]

Must have been Sue because Pounds is written upside down and backwards, on the left side,
Y axis.

 

[atestani]

View attachment 634451

Ah... the "official" one! Thank you!

This looks very close to the RASP one in Thrustcurve.org and being used in OR (which also shows two other curves?) Rocksim isn't even close, at least in the table (I don't know how to see the actual curve). There is another curve in Thrustcurve.org that is labeled Rocksim, that I recommend be deleted.

So, except for Rocksim what we have been using is "correct".

I do have two other curiosity questions if I may:
1. Why is this motor designated as I195 and not I236?
2. Is all this discussion in vain because Blackjack motors are being discontinued?

 

[kjhambrick]

Shucks !

I found an error in the aei195j.eng file that I posted above -- I had the motor diameter as 29mm but it should have been 38mm.

Otherwise, TLAR ...

Fixed !

-- kjh

 

[Rocketjunkie]

Any recertification? Or are we still using the 1999 cert?

 

[jmasterj]

1. Why is this motor designated as I195 and not I236?
2. Is all this discussion in vain because Blackjack motors are being discontinued?

I'm also interested in #1. #2 doesn't have an accurate premise - they aren't being discontinued (yet), many of them are on a seasonable production schedule. The I195J is sadly on that list.

 

[JohnCoker]

OK, I uploaded the cert letter and deleted the Rocksim format file.

Note that you can see any of the thrustcurves by clicking on the format name (first column of the table).

 

[5x7]

The source of the confusion is possibly an earlier certification, in this flyer from Aerotech it was certified in 1996 or prior. This is Aerotech’s curve, and it is very different and looks like the source of the I195 designation.