L2 Project: WM Drago 4 "EX-1127"

[Theory]

Cool

I’m using 2K clear satin on the silver. Used the gloss on the nose cone and fins. Came out very well

 

[rfjustin]

Looks great!

 

[Handeman]

Hope your silver works. I've tried several different brands and methods. I won't use silver/chrome paint again.

 

[Theory]

110% complete

huge thank you to Wildman, Mark at Stickershock23, Loc Precision, Missile Works, Rocket Man and all of you

she is 10 pounds 13 ounces of pure awesome

 

[Tim51]

110% complete

huge thank you to Wildman, Mark at Stickershock23, Loc Precision, Missile Works, Rocket Man and all of you

she is 10 pounds 13 ounces of pure awesomeView attachment 427659View attachment 427661View attachment 427660View attachment 427662View attachment 427663

That is absolutely superb.

 

[crossfire]

Very nice build

 

[Handeman]

Looks great! Hope to see it at BattlePark soon!

 

[Theory]

Hope to see it at BattlePark soon!

YES!!!!!

really looking to turn her lose there!

 

[Theory]

---small update---

conducted ground tests of the recovery system yesterday. 2.0 grams for the booster and .5 grams for the nose cone worked very well. I could likely use .4 or even .35 grams for the nose with equally good results.

used two 2-56 pins in the booster and two in the nose.

the first flight is scheduled to take place at NOVAAR later this month. the motor will either be an AT I300 or Loki I405. will be a "game time decision" as i will like load both.

 

[crossfire]

A half gram for drouge? I would use at last 1.5 grams. Heck a AT motor has 3/4 gram

 

[Theory]

no, .5 gram for the nose (HED). really only need to presurize the top portion of the 6:1 nose cone as the electronics bay come a solid 3+ inches into the bottom of the nose cone.

looks like i didnt explain that as well as i should have. too early int he morning LOLz

 

[FMarvinS]

I agree with crossfire. O.5 gm is too little even for HED. I have a Wildman 3 inch Punisher and another 4 incher with HED. Both use three 2-56 shear pins to the nosecone. How extended was the kevlar cord pulled out on ground testing? I'd suggest that the chute plus 75% of the cord or more is a positive ground test (as long as the cord is not too taut which could result in too large a charge and cord separation from the cone). For each of my above HED deploy rockets, I use 1.5 gms. Also, friction can arise between the NC bay and the inside of the cone; so, I usually wipe down these surfaces with a small amount of a mild car de-greaser (from autozone) on a paper towel to diminish this resistance prior to placing the shear pins. Finally, if there are any questions about how to attach the laundry for HED-see the HED section on Wildman's site under the "downloads" button. Good luck!

Fred, L2
ICBM, S.C.
KG4YGP

 

[Theory]

interesting...

had full extension using a 15' Rocketman 3 look kevlar cord.

if the weather improves i will set it all up again and document it.

 

[crossfire]

I probably would use 2 grams in each section.

 

[Theory]

I probably would use 2 grams in each section.

Need to as why you would recommend that.

2 grams cleanly separated and reached near full extension of the harness (20' OBH three loop) for booster. talking about 20" of 4" air-frame with 2 2-56 pins. not even factoring in the unfilled portion of the 54mm motor mount.

why would I ever need the same charge for a nose cone? that math just doesnt work. we are talking about significantly less volume with a large portion taken up by the chute, harness, nomex etc.

 

[rfjustin]

Sharing just for comparisons sake...

 

[Theory]

cool deal!

thank you for sharing

 

[crossfire]

There you go. 1.5 and 2 grams

 

[jd2cylman]

Sharing just for comparisons sake...

"Dog barf."
“I hope not”

 

[Theory]

She few today!

first flight on an I300



second on an I405


Ready to really push it this fall at Battle Park

 

[rfjustin]

Nice!

What did you end up with powder wise for the drogue and main?

 

[Theory]

due to the very low altitudes for each flight - 1000' ish, i went with single deploy.

the first time around i went with the 2 grams that i ground tested with. it worked but was very lazy; not as energetic as it looked during the tests.

due to weathercocking it lost a lot of altitude (the flight on the I300 was only 791 feet. i was expecting almost 900) and as such i was able to clearly view the deployment event. it is possible that the lazy deployment was the result of a fair amount of horizontal velocity at the time the charges went off.

went with 2.5 grams for the second flight on the I405 and that was perfect. I will be using this for future flights.

 

[Theory]

finally got around to uploading videos...

EX-1127 on an Aerotech K1103:

 

[rfjustin]

That K-1103 rocked! Need to get (3) of those on order soon.

 

[Theory]

@rfjustin i see where youre going, and i like it ; - )

as our local vendor said the K1103 X is the "big motor in a small case!"

will definitely be buying more