Dimensional Drawing for Aerotek F44-8W Motor

Any idea where I could get a dimensional drawing of an Aerotek F44-8W motor?

I emailed Aerotek but thought I'd ask here too.

It's listed as 70mm long... is that just the barrel length... or the overall length?

Is the 24 mm diameter the barrel diameter, or the boss on the rear nozzle?

Thanks

70mm is the length from the fore end of thrust ring to the top of the casing or as you call it the barrel. 24mm is the "barrel" dia. thrust ring is wider.

lakeroadster said:

Any idea where I could get a dimensional drawing of an Aerotek F44-8W motor?

I emailed Aerotek but thought I'd ask here too.

It's listed as 70mm long... is that just the barrel length... or the overall length?

Is the 24 mm diameter the barrel diameter, or the boss on the rear nozzle?

Thanks


View attachment 405690

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I just want to point out that in every one of your posts aerotech is misspelled. It is aerotech and not aerotek. If you misspelled it on the email address, they will never reply.

tbonerocketeer said:

I just want to point out that in every one of your posts aerotech is misspelled. It is aerotech and not aerotek. If you misspelled it on the email address, they will never reply.

Click to expand...

Thanks. I went to their site, and copied their email address. I haven't received a reply though. No worries.

I have a used E30-4 case, so I measured it. The black part is 70mm, including the thrust ring.

The case diameter is 23.7 mm, the thrust ring is 25.5mm. The thrust ring is 4.7mm tall.

The ejection charge is 17.7mm tall, 12.7mm across the flats. Nozzle is 12.9mm wide, 11.3mm tall.

gna said:

View attachment 405995 View attachment 405996 I have a used E30-4 case, so I measured it. The black part is 70mm, including the thrust ring.

The case diameter is 23.7 mm, the thrust ring is 25.5mm. The thrust ring is 4.7mm tall.

The ejection charge is 17.7mm tall, 12.7mm across the flats. Nozzle is 12.9mm wide, 11.3mm tall.

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Thanks... much appreciated!

With all the different lengths between the motors, very good reason to not use engine blocks in the MMT. There are many ways to retain the motor and that is all you need.

rcktnut said:

With all the different lengths between the motors, very good reason to not use engine blocks in the MMT. There are many ways to retain the motor and that is all you need.

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I took your advice and revised the motor mount to eliminate motor blocks / thrust rings. Thanks for the suggestion.

At 24mm, a standard Estes BP-sized motor mount (70mm long, or 95mm if you might want to use Estes E12s) is fine for any of the Aerotech single-use motors.

Just speaking for myself, I find the idea of leaving out the engine block up front to be more applicable to larger motor mounts and higher-power rockets. At 24mm, I prefer a garden variety motor mount with an engine block. As said above, I can fly any of the single-use motors in it, and when flying BP motors I don't need to bother with the tape thrust ring. The tape thrust ring isn't a big deal but it is one more task needed to prep a rocket.

neil_w said:

The tape thrust ring isn't a big deal but it is one more task needed to prep a rocket.

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+1 for 24mm motor mounts. E size engine hook and motor tube accommodates most composites and all BP motors (with orange spacer for C and D motors).
For 29mm motor mounts, I leave the motor block off. Too many variations in motor length. Tape thrust ring in the back for BP motors. No engine hook cuz it also limits the size of your motor. Even though Semroc has an "F" hook and ASP has a "G" hook.
Screw on retainer or tape for motor retention.

With no motor block, it's easy enough to wrap a masking tape thrust ring on the Estes motor. You want it 1/4" wide so you can still use the motor hook. If you want to use the motor hook in an Estes model for the composite motor, it fits into the flat slot in the tapered part of the rear closure. The composite motors have a more energetic ejection so apply a wrap of tape to the motor hook and rear of motor.

Thanks to TRF Member Aero Tech (Gary) for sharing this drawing of their E-20 24mm motor.