AT L-1000 DMS – flying case with a nose cone and 4 fins

[rfjustin]

The AT L-1000 DMS has been out for a number of years, but I have not played with one yet. In short, I plan to glue and composite reinforce a coupler directly to the top of the L-1000 and see what kind of altitude can be obtained by mostly eliminating a traditional airframe. Tfish posted some helpful information here which led to a McMaster-Carr order.

DMS L1000 Dimensional Drawings?

Unable to find a good dimensional reference for this motor. Here's the DMS data sheet, but still no joy: http://www.aerotech-rocketry.com/uploads/e0e20829-0a44-4b9a-9f3d-b5ea58cbf62a_DMS%20Data%20Sheet%205-7-14%20Small.pdf I'm wanting to cram this in a small 54mm bird. Points of concern...

www.rocketryforum.com

 

[rfjustin]

Going to cut a small switch band from a REK tube to make sure the nose cone stays true during boost. Single deploy on this one, KISS.

 

[rfjustin]

The 3D printed aft "closure" came off with ease.

 

[crossfire]

Very nice project you got going. What type of expoy will you use to attach the fins?

 

[rfjustin]

Very nice project you got going. What type of expoy will you use to attach the fins?

JB Weld. Dr. Reese would not approve... LOL

 

[firemanup]

Ready for MWP?

 

[BDB]

This redefines "single use" in our hobby!

 

[mbeels]

What speed and altitude do you expect?

 

[stealth6]

Oh, yes, I like this a lot.

Keep it as bare-bones a possible......no paint, no rail buttons (launch tower or flyaway guides perhaps), etc.

And PLEASE keep posting updates, pics, video, etc.

nice,
s6

 

[shawn_rocket]

I've been waiting for someone to attach a few fins to a motor to see the speed and altitude you can achieve! Should be pretty cool.

 

[rharshberger]

What speed and altitude do you expect?

...fast...and wayyyy up there....

 

[cerving]

Cool. Single deploy, huh? Streamer, I assume... and a GPS,

 

[3stoogesrocketry]

What speed and altitude do you expect?

I'm spitballing around mach 2+ to 30k.

 

[rfjustin]

Ready for MWP?

Negative. No waiver to support such a flight.

 

[mo2872]

Can't wait to see THIS video.........and sounds like a perfect application for the new Eggtimer apogee......

 

[Nytrunner]

Head end apogee deploy w/ tracker?
What electronics suite are you using?

 

[BBrown]

Negative. No waiver to support such a flight.

I know a place!

 

[rfjustin]

Head end apogee deploy with LL Electronics tracker (trying to keep the tracking as small as possible). Single RRC3 for deployment, they are solid, tried and true.

 

[Michael Wilson]

Negative. No waiver to support such a flight.

Hopefully its at Argonia next year, I wanna see this

 

[Cameron Anderson]

At BALLS last year there were 6 guys who all did something similar. I was standing in line with my Wildman Mach 2 loaded with an L1000 and I watched rocket after rocket shred...some 10 feet off the tower, some as they went transonic. But they all failed. I still want to do this too though. Keep posting!

 

[crossfire]

At BALLS last year there were 6 guys who all did something similar. I was standing in line with my Wildman Mach 2 loaded with an L1000 and I watched rocket after rocket shred...some 10 feet off the tower, some as they went transonic. But they all failed. I still want to do this too though. Keep posting!

By shred your saying fins came off?

 

[rfjustin]

At BALLS last year there were 6 guys who all did something similar. I was standing in line with my Wildman Mach 2 loaded with an L1000 and I watched rocket after rocket shred...some 10 feet off the tower, some as they went transonic. But they all failed. I still want to do this too though. Keep posting!

Not feeling very warm and fuzzy about this now!

 

[Cameron Anderson]

By shred your saying fins came off?

All manner of things came off...fins came off, chutes came out, everything was rapidly and rapidly disassembled.

 

[Cameron Anderson]

Not feeling very warm and fuzzy about this now!

Do it! Come fly at Black Rock and I'll do the same thing and we can have an altitude competition.

 

[rfjustin]

Hopefully its at Argonia next year, I wanna see this

That's the plan, likely Airfest.

 

[TimothyG]

I'd use better epoxy if you wanted to make it. We used panel bonding with mixing nozzles to keep air from being mixed in on our surface mount fins for an M min diameter booster. Worked great. Fins even survived mach 2.5 on the sustainer with same arrangment. If you moved the fins forward about 3.5" from base you'd have the makings of a very nice sustainer on a two stage project. Plus less drag up high means fins are more likely to stay on(my unsupoorted theory).

 

[rfjustin]

I'd use better epoxy if you wanted to make it. We used panel bonding with mixing nozzles to keep air from being mixed in on our surface mount fins for an M min diameter booster. Worked great. Fins even survived mach 2.5 on the sustainer with same arrangment. If you moved the fins forward about 3.5" from base you'd have the makings of a very nice sustainer on a two stage project. Plus less drag up high means fins are more likely to stay on(my unsupoorted theory).

I've done a Wildman Mach 2 on an L-935 to 23K with just JB Weld with good results. This build will have a slight leg up on what I have done before, more to come...

 

[TimothyG]

I look forward to seeing this thing fly. If you pull this off I recommend looking at filling a 54mm airframe with propellant if your into EX. The volume increase using a 2.25" airframe as the casing in a manner similar to your project here is impressive.

 

[manixFan]

The amount of force on the fins at those speeds is significant. And any misalignment will greatly increase that stress. That stress will be transferred to directly to the motor case, which was never intended to be a structural component. Fins that are adhered directly to the case will add force/stress that was never part of the design intent of that disposable case. It's likely that at those speeds, and with any non-zero angle of attack, the amount of force/stress transferred to the case will be very significant, and could certainly cause the case to fail.

Or maybe not!


Tony

PS: by fail I don’t mean the case actually failing, but the case may flex enough that the fins decide to go their own way

 

[Cameron Anderson]

Do it.

Lots of opinions here of varying levels of support and informed opinion. But until you try (and succeed or fail), no one will know.

Do it.