Aerotech M1350W DMS Assembly

[Aerow]

So I got my Motor in yesterday from BuyRocketMotors.com, Thank you.

So now here it is, my scale is broken so no weights of individual parts sorry.

Quite a big box for just 1 motor.


Everything it comes in.


All the parts, hard to mess it up. Though one grain was kinda gooey on one end.


The Forward Bulkhead, tapers out in the middle for epoxy retention and the top is tapped for an eyebolt. O-Ring pre-attached to the bottom.



Nozzle and Case, comes pre-assembled, pretty big nozzle.



O rings are placed between each grain, doesn't quite fit all the way around.


See Next Post.....

 

[Aerow]

Case and completed sleeve


Notice grooves on inside of case



Need to insert a thicker O-Ring around forward bulkhead, luckily they give you a nice stick to do so, takes a bit of force to shove it in all the way.


Mixed up epoxy according to the directions, didn't quite use all of it, but filled up all around and a bit on top of the forward bulkhead. Took around 2 hrs for it to not be tacky anymore.



And here is the complete motor, other one is a CTI 38mm 6XL for size comparison, and a 12.5 inch ruler.


And now to try and certify Level 3 with in on the 1st. We shall see.

 

[Getmore]

I look forward to get my hands on one of them.

 

[cwbullet]

Neat construction. Thanks for posting. I has no idea the forward bulkhead was aluminum.

 

[Aerow]

Yeah its pretty light, and a nice feature. Whole process took less than 5 minutes. Will let everyone know how well it holds up once i fly it, will take pics of whats left.

Also no Ignitor came with it, so you need to supply your own. Any suggestions?

 

[rfjustin]

Thank you for posting this, looks like a neat motor!

Near as you can tell, do the liner and grains sit directly on top of the pre-installed nozzle? Meaning when you look down the case from the top, do you simply see the entrance cone of the nozzle?

Cheers!



Justin

 

[Aerow]

Yes, near as i could tell it just sits right on the nozzle, Maybe someone in the future can take a light and look down the deep dark hole.

Post 25...hehe drawings

 

[edwinshap1]

Looks like their normal liner and nozzle for a 75mm, so grains would seat against edge of nozzle like in an RMS load.

 

[crossfire]

Why O-rings between grains?
Thanks

 

[Aerow]

Not sure why, but its what the instructions said to do between each grain, so yeah.

Maybe someone on here has an idea.

 

[daveyfire]

O-rings at the joints helps things light easier and prevents small hot gas jets from forming at the grain faces if/when they are squeezed together under acceleration. If you're gluing the grains in (e.g., on certain CTI loads), it also helps prevent glue from getting on the grain faces.

 

[mikec]

Also no Ignitor came with it, so you need to supply your own. Any suggestions?

The instructions say it comes with an igniter:

https://www.aerotech-rocketry.com/u...2637e_75mm DMS Instructions 5-20-14 Small.pdf

 

[Aerow]

Well i got jipped then, no matter i got some first fires and twiggies laying around somewhere

 

[pyrobob]

Hello there. I spoke to Karl Baumann at Aerotech and I know he packaged these kits up himself. Give him a call or send an email and I'm sure he'll send you some igniters no problem. That, or send me a message and I'll make the request and copy you to it. Thanks again.

 

[Scott231]

The enormity of said motor scares me...

 

[ckjohnson]

I am looking forward to launching my L3 on that motor!

Pyrobob, I'll contact you for the motor.

 

[Aerow]

Oh and in case anyone was wondering the forward closure accepts a 3/8 in bolt. not a 5/16.

Lowes sales a forged one, but i had to cut it down, was like 8" long lol.

 

[mrwalsh85]

Oh and in case anyone was wondering the forward closure accepts a 3/8 in bolt. not a 5/16.

Lowes sales a forged one, but i had to cut it down, was like 8" long lol.

I get mine from Fastenal... They have reasonable thread lengths and are better quality, IMO...