Terrier Malemute 1/5.2 scale build and info

[Charles_McG]

I started gluing in the Terrier motor mount today.

Printed centering rings, which I usually glue back to back to thicken. Channels for wire chases for possible future staging.

I printed a piece to anchor carbon fiber slats that go through the fins. One centering ring is above it, another will go below after everything is glued in place.



And in situ, with the slats in place.

 

[Charles_McG]

Bolt cove details, aft centering ring and motor retainer.

 

[Ez2cDave]

Bolt cove details, aft centering ring and motor retainer.

Wow, Charles . . . Looks great !

Dave F.

 

[Charles_McG]

Used bondo glazing putty to fill in the epoxy lumpiness and the wave in the printed fins.

 

[Charles_McG]

Malemute motor mount work tonight.

 

[Charles_McG]

My experiments at foam filling annular spaces didn’t turn out so well. I decided to support the payload sleeves with balsa strips.

 

[Charles_McG]

I finally decided to go with the Improved Malemute, rather then the first flight version Peter Alway documented. The difference is wiring chases down the sides of the motor. After a dive into Patriot details and finding some appropriate balsa in my stash, here's where we stand. My version will turn out a touch short - but I'm not entering it into competition.

Scale would be 1/8 balsa - which I shaped by sanding and tried to warp with ammonia on a PVC mandrel.



Well, I didn't get much warp, so I had to fall back on more sanding. Here's the end result.

 

[Ez2cDave]

Scale would be 1/8 balsa - which I shaped by sanding and tried to warp with ammonia on a PVC mandrel.

Well, I didn't get much warp, so I had to fall back on more sanding. Here's the end result.

Charles,

I had a thought . . . What about warping the sheet of Balsa, BEFORE cutting out the strips for the Conduits ? There would be a lot more "leverage" to induce the Warp.

Dave F.

 

[Charles_McG]

Were I to do it again, I’d do 2x 1/16” layers per channel. Shape, then glue stacked to thickness.

I’ve shaped blades for helicopter recovery. I think a thinner material would have worked better.

 

[Charles_McG]

And some painting on the Improved Malemute research-style payload.

 

[Charles_McG]

So I’ve been painting up a storm. It’s not the best weather, and the gloss white has been a little runny as a result. So not my best work - but it’s good at feet. Just not inches.

The Improved Malemute motor need a second orange pass before I pull the tape on the white chases.

Getting close to decal time.

 

[Ez2cDave]

Wow, Charles, it looks awesome !

Dave F.

 

[Bruiser]

Sweet!

-Bob

 

[Charles_McG]

Decals on. The last external touch would be a black stripe of t leading edge of the Malemute fins - the real ones have an ablative coating.
I’m still thinking about it.

Terrier Booster.


Fin detail. This is actually the worst one. The angle setting fixture got messed up on this one.



Terrier info sticker. With some liberties taken, like switching to a closer ordnance station. And nitrocellulose to APCP with a reasonable mass.



Improved Malemute/Patriot motor.


And the other side. The flight number containers my NAR number. The real 46 series is at about 30.



I used the details of the Tomahawk despin module (from a Ute Tomahawk data bundle) to make graphics to go on the switch band. Above that is my model NASA payload, RCS module, telemetry unit, and 11° total angle nosecone.



And stacked.

 

[Ez2cDave]

Charles,

The SKY is "calling her name" . . .

Dave F.

 

[Charles_McG]

And the first flight.

 

[Charles_McG]

By request, some details.
This flight simmed at a stability of 4:1 dCpg:diameter or 15% of length. The winds were about 5mph. I was aiming for a boost of 15G, and got it.

The flight computer was an eggtimer Proton running 1.03G (to help gather data on new AltAccel code).

The settings were
Baro LDA 200'
Accel LDA 0.5s @ 3G
Channel 1 Airstart: Burnout 1 + 0.1sec. (A small backup separation charge)
Channel 3 Airstart: Burnout 1 + 0.5sec. Sustainer iginition
Channel 4 Drogue at apogee
Channel 6 Main at 400'

Velocity limit set to 150fps @ Timer.

I'll have some Proton V Sim graphs coming.

 

[mbeels]

Really great flight, that's a success!

(to help gather data on new AltAccel code).

What changes are there coming in firmware 1.03G?

 

[Charles_McG]

What changes are there coming in firmware 1.03G?

I think I’d better get permission before I spill @cerving ’s beans.

 

[rharshberger]

By request, some details.
This flight simmed at a stability of 4:1 dCpg:diameter or 15% of length. The winds were about 5mph. I was aiming for a boost of 15G, and got it.

The flight computer was an eggtimer Proton running 1.03G (to help gather data on new AltAccel code).

The settings were
Baro LDA 200'
Accel LDA 0.5s @ 3G
Channel 1 Airstart: Burnout 1 + 0.1sec. (A small backup separation charge)
Channel 3 Airstart: Burnout 1 + 0.5sec. Sustainer iginition
Channel 4 Drogue at apogee
Channel 6 Main at 400'

Velocity limit set to 150fps @ Timer.

I'll have some Proton V Sim graphs coming.

Thank you Charles! I have a Proton and an upcoming multistage build project.

 

[Leo]

Excellent! Congrats!

 

[Charles_McG]

Some graphs:

Altitude filt_Baro_Alt Proton V Sim


Vertical velocity, Filt_Baro_Veloc, Accel_Velocity and sim (as VAccel)



Accelerometer Gs v Sim

 

[Charles_McG]

I spent some time tuning the sim and have a really good match to the data. I added 10% mass to the sustainer. Probably reasonable after the dog barf. And I added a ‘drag plate’ near the tail of the rocket: a zero length transition with matching fore and aft diameters. It doesn’t change the Cp. at least the ‘static’ one. The sustainer body is 3”. A drag plate with a diameter of 3.6”, along with the 130g mass bump matches beautifully. Graphs tonight.

 

[kbfrazier]

Dave,

Are your drawings available. I can scan them at a supper hi-resolution or create 3D models using SolidWorks based off your drawings. Thinking of creating the nuclear version. I have two 3D printers and can create pretty good mold or individual pieces.

Thanks,

Keith

 

[Jim Burgess]

I spent some time tuning the sim and have a really good match to the data. I added 10% mass to the sustainer. Probably reasonable after the dog barf. And I added a ‘drag plate’ near the tail of the rocket: a zero length transition with matching fore and aft diameters. It doesn’t change the Cp. at least the ‘static’ one. The sustainer body is 3”. A drag plate with a diameter of 3.6”, along with the 130g mass bump matches beautifully. Graphs tonight.

 

[Charles_McG]

@Jim Burgess - looking good. What tubing did you base your Terrier on? And it looks like you went with a simple tapered trapezoid, rather than a more complicated Terrier fin?