Well, I meant in comparison to the old F100, which I believe was actually rated as a F50 or 60.Would an actual F80 black powder motor be possible?I know I would pay good money for that, plus it would open things up a bit considering that Estes is the only company currently making a black powder F motor,provided they aren't the ones to make it.Plus the greater thrust would be great for shorter, heavier rockets without having to shell out the cash for composites, and the limited impulse would keep it under high power designation so you wouldn't need to be certified to fly them.
My interest was in seeing higher power short duration black powder motors, specifically FSI F100's and also F7's.I have two FSI Viking kits that I was hoping to try and fly with the original FSI motors if I could find them but no luck there so they were converted to 18mm, I was looking for both The D18's and D20's but they've proven nearly impossible to find.I know of two people who have some but they can't legally ship them here.
They have experimented with a high-thrust E that I presume was at least partially cored. I heard a first-hand account of a test firing around two years ago, and I believe it was mentioned at the NAR Manufacturers' Forum a couple of years ago, but I've heard nothing since and have grown pessimistic about its coming soon, if ever.
@bjphoenix
That's unfortunate.
I'm not aware of a video and I don't know the owner of the rocket so I can't comment on altitude other than it appeared to be very high. The same rocket flew on a J250 to a little higher altitude. The I65 is the opposite of a high thrust short duration core burner in that it had relatively low thrust for a long time however the posted thrust curve shows that it at least has its highest thrust when it is trying to get the rocket off the pad and up to speed. After the launch day I remembered that LOC has the EZ-I65 kit that is presumably made to work with that motor. At our launch the rocket appeared to be maybe a little heavy for that motor in that it moved slowly at first and maybe didn't have optimum speed when it cleared the rail. Luckily it did stabilize itself well enough to provide a reasonably vertical flight. I don't like long burn motors if there is any chance that the rocket will turn into a ballistic trajectory and land far away, even including motors like C6 and E12.
Nope, not an EZI-65 but it could be an AT I65W motor ...
Back to the topic at hand ...
;
;F100 modified 8/11 to match NAR published delivered impulse, as tested 7/86
F100 27 150 0-4-6-8-10 0.0500 0.1080 F
0.147 20.00
0.230 49.85
0.521 94.99
0.669 48.00
0.756 20.00
0.930 0.00
;Total Impulse 40.72 (N-Sec)
;Avg Thrust 43.79 (N)
;Specific Imp 83.05 (Sec)@Buzzard gave me an FSI F7-6 a while back. I don't recall if I measured it, but it's definitely less than 29mm, and all the references I've seen say it was 27mm. I figure I'll mount it in 29mm ID tube with a cardstock shim to bridge the difference.
Stephen --
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;F7 modified 8/11 to match NAR published delivered impulse, as tested 3/80
F7 27 150 0-4-6-8 0.0580 0.1110 F
0.400 10.00
0.450 10.60
0.500 10.00
0.650 6.00
0.700 6.20
1.000 7.00
1.100 5.75
1.300 4.50
1.500 5.09
9.200 5.00
9.520 0.00
;Total Impulse 48.80 (N-Sec)
;Avg Thrust 5.13 (N)
;Specific Imp 85.80 (Sec)Long ago before Estes made C motors we found that FSI made them so I bought some and modified a rocket to use them, the FSI C motors were 21mm.
