Nozzle size

[Barracuda]

Excuse my ignorance but..I have 5 reloads in a tupperware I thought to be E28-4's(I also use E18's a lot) but one of the nozzle openings is smaller than the rest.Would the difference between a E18 and a E28 be nozzle size or is the propellant different?

 

[cwbullet]

I checked the AT website and no info there. Someone will have to check their stash. I will ask my wife in the am if there is no answer.

 

[JDcluster]

If the both motors have: about the same impulse, and the same number of grains than; my best hypothesis would be: the smaller nozzle would go to the E28's.

 

[cjl]

I believe they're different propellant types as well as a different nozzle, and the smaller nozzle would go to the E18. I'd double check with aerotech before flying though.

 

[JDcluster]

The one thing I over looked, good catch!

JD

I believe they're different propellant types as well as a different nozzle, and the smaller nozzle would go to the E18. I'd double check with aerotech before flying though.

 

[cwbullet]

I checked and the E18 I have has a smaller nozzle.

 

[cavecentral]

All the lower thrust motors in the hobbyline series have smaller nozzles than the higher thrust counter part.

Easily learned and remembered when trying to install the $#$#%^ ignitors or find one that fits!

 

[daveyfire]

The E18 uses a 01300 nozzle, while the E28 uses a 01350 nozzle. The 01300 has a throat diameter of 0.104" and the 01350 has a throat diameter of 0.141".

Sources:
https://www.aerotech-rocketry.com/c...s_assy_dwgs/24mm_mr_rms/24-40_e18-4w_assy.pdf
https://www.aerotech-rocketry.com/c...s_assy_dwgs/24mm_mr_rms/24-40_e28-4t_assy.pdf
https://www.rocketmotorparts.com/products.html#singlethroatnozzles