MMX Harpoon AGM-84A

[Austin]

I started another project today, after putting the final touches on the DW and finishing the paint on the Amraam and on the MMX Maverick.

I started another Scale MicroMaxx rocket; the Harpoon AGM-84A! It uses the same BT as the Maverick, but I deviated from the design a bit. CR's were made from a bored out 7/16" wood dowel and the lower CR was also carved out as a boattail. Assembly should start tomorrow and I can't wait to get it going.

Here are some pics so far:

https://www.rocketryforum.com/ctulanko/album/index.php?dir=mmxharp

Carl

 

[Austin]

I did a bit more work on the Harpoon. The motor mount tube and body tube were sanded to remove the glassine layer, then I used epoxy to glue the forward and rear CR's to the Motor Mount. Each CR is flush with the end of the tube. A piece of Coupler tube was used as a Motor Stop and some Kevlar thread was tied to the coupler, then it was inserted into the motor mount from the bottom and positioned to the correct depth using a motor. A drop of thin CyA from the top of the mmt tube held it in place.

Next, I sanded, marked and slotted the Body Tube for the fins. This was the tricky part; I planned on using 3 different glues to install the motor mount and fins, all at one time. Epoxy was mixed and applied to each fin area on the motor mount tube where the Thru-the-Wall fins would mount. It was set down and some Alphetic Resin (yellow wood glue) was inserted into the body tube in the forward CR ring position using a small wood dowel. the motor mount was quickly inserted into place and thin CyA was used to tack the tailcone/CR to the bottom lip of the body tube. this was done as the tube was slotted all the way to the end and I didn't want it to seperate while inserting the lower fins. Finally, all eight fins were installed before the Epoxy had a chance to set. Once finished, the tube was left in an upright position so the Alphetic Resin could run down and completely coat the forward CR and form a fillet.

As is, the model is ready for fillets and primer, which should be done tonite.

More Pics: https://www.rocketryforum.com/ctulanko/album/index.php?display=mmxharp/mh07.jpg

Carl

 

[KenParker]

Through the wall fins on an MMX?

Carl.... have you been sniffing glue again?

 

[Milo]

Well you know Ken, the G's at launch placed on these MMX's is pretty incredible. You don't want them shearing off.

 

[Austin]

Yea, what Milo said!!!

That is also one of the reasons I need to use G-10 for fins, yea, that's it.....the other reason is it looks scale in thickness.

Carl

Hmmmm...just thought of three or four more scale MMX Missiles I can build...YEE HAA!

 

[eugenefl]

Originally posted by CTulanko
Yea, what Milo said!!!

That is also one of the reasons I need to use G-10 for fins, yea, that's it.....the other reason is it looks scale in thickness.

Carl

Hmmmm...just thought of three or four more scale MMX Missiles I can build...YEE HAA!

You're nuts! I have to admit, I never thought I'd see you reach this far to the other spectrum of rocketry.

Great job on the mini-missiles! When are you going to report on the flights?

 

[Austin]

Just thought I would post a report and some final pics...The MicroMaxx Harpoon AGM-84 did fly and flew well! I got four good flights, stability was great and with a MMX-2 motor, it achieved about 55-60 feet, but hit it fast.

I re-painted the Harpoon and spent much time this week finishing the decals, which took some time. The forward decal is a wrap around, while the rear is applied in strips. Decal details were taken from my 4" 1/3 scale Harpoon and are an exact miniature of the 4" version. Some pics were taken and just posted, along with a decal sheet pic. Other flight pics can be found in the events forum. Finally, the entire rocket was coated with Future once finished.

Here are the pics: https://www.rocketryforum.com/ctulanko/album/index.php?dir=mmxharp/&startpic=10

Enjoy,

Carl

 

[Stones]

Carl...
I tend to believe that smaller rockets are more of a challenge to build than the big ones.
Sir...you are the master!

 

[sandman]

Really slick, Carl, I guess I'll have to put the decals on my MMX Nike Hercules before Whitaker too.

Like I don't have enough to do!

Nothing like a deadline to get me to work harder.

sandman

 

[Micromeister]

Carl:
Very nice Job. Luv's them Micros'