A guy in my club had some, he seemed to have a very difficult time getting them to ignite.
Thanks that is good feedback.
Apogee says that a G53-5 is a very poor choice as the rocket doesn't go very high and delay is too long. Five E6s wil have even less thrust.
Lets look at the numbers.
............Total Impulse.....Max Thrust.....Simmed Alt.....Comments
G53-5FJ.....92 Ns...............84 N..............366'.............Apogee reports poor choice
G79-4W....108 Ns.............93.9 N.............430'.............Best first flight
E6-4 (x5)..200 Ns..............77 N...............TBD.............Goal realistic launch.
I calc the liftoff mass to be 687 grams and the max liftoff mass with
5x E6 motors to be 875 grams. Couple that with the almost double total
impulse I should get some very good altitude, and possibly the E6-6 might
be a better choice with the long burn.
The rocket is 5.6 inches in diameter so the aerodynamic drag will probably be much more of a factor than the weight. If you do launch it on five E6s make sure you take a video of it as it will be the rocket's first and last flight.
Gee thanks for the positive support.
That's without a cluster mount or the extra nose weight it would need with 5 motors in the back. Also, E6s are not what I would describe as capable heavy-lift motors, and 5 of them would still be questionable on anything more than about 22oz or so (even if you did get all of them lit).
First the mass difference is not all that great.
RMS (reload) G79-4W loaded mass is 158 grams (I already own this hardware)
5x E6-4 mass is 205 grams.
There are more ways to adjust Cp and Cg than just by adding nose weight.
I have already consided using clear fins and just gluing on scale size fins for
a more normal appearance.
I have attached the spreadsheet I am using to review mass analysis.
Now for the real challenge how do you light all 5 motors reliably?
Any ideas on how to get it done.
View attachment Saturn V - five engine cluster.xlsx