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We are planning to use 24mm motors in the E and F class. To get to the 825ft level we will use AeroTech re-loadable and single use motors. We need to get the ejection at around 7 seconds, but many of the 7 second delays go past 9 seconds. We might want to look into modification holes drilled into the delay element. If the rocket is over 380g (including motor) we will need an F motor.

Possible Motors

Motor	Type	Loaded Weight	Total Impulse *	Burn Time *	Rocket Weight   for 825ft	Cost	Comment
E20-4/7W	Single Use	49	35.0	1.6	320-360g	$14	2 pack
E28-4/7T	Reload	55	39.7	1.2	320-380g	$17	3 pack
E30-4/7T	Single Use	47	34.5	1.2	320-360g	$21	3 pack
F24-4/7W	Reload	62	47.3	2.1	420-460g	$20	3 pack, need to add weight
F30-4/6FJ	Single Use	54	47.0	1.5	410-460g	$14	May need to add weight
F39-6T	Reload	59	49.7	1.3	430-480g	$20	3 pack inconsistent delays
F32-4/6T	Single Use	64	56.9	1.7	480-530g	$11	Most expensive

* According to ThrustCurve.org

Here are the thrust charts from AeroTech.

Assembling an AeroTech reloadable is something we need to learn. You need to follow the instructions closely. Making one error in the assembly may destroy your rocket. One place where we differ with the instructions is at the end. We don't use the red cap to hold the igniter. We use either a rubber band or masking tape.

Here is a cheat-sheet on assembling an AeroTech motor.

Here is a YouTube demonstration of assembling a G motor.