Public Missiles Ultimate Endeavor

Public Missiles - Ultimate Endeavor

Contributed by Brett Noake

Manufacturer: Public Missiles
Rating
(Contributed - by Brett Noake)

Brief:
T' kit is designed t' use a piston ejection system (motor) ejection t' deploy the parachutes. Begad! T' booster section uses a 60" parachute and t' payload section uses a 48" chute.

Rocket Pic

Construction:

  • 1 6"x4' Airframe Tube (booster)
  • 1 6"x3' Airframe Tube
  • 6" Nose cone (fiberglass)
  • 6 G10 fins
  • 1 54mm Motor tube
  • 3 38mm Motor tube
  • 3 centerin' rings
  • piston assembly
  • 2 elastic shock cords
  • bulkhead assembly
  • 1 60" parachute
  • 1 48" parachute
  • 2 3/4" launch lugs

Instructions for this kit were useful, as in most PML kits. Begad! However, matey, matey, I modified t' kit quite a bit. Aye aye! First I added 3 more 38mm tubes. Well, blow me down! I figured there was room for them, me bucko, I might as well use it. Avast!

Finishing:
Finishin' was simple, or at least as simple as seven feet o' six-inch airframe can be. Well, blow me down! There are a lot o' seams t' fill!!! Although phenolic tubin' is strong, larger diameters are somewhat flimsy and prone t' cracking. I would suggest glassin' t' airframe - nay necessarily for flight stress, me bucko, ya bilge rat, but for landings and handlin' around t' house. Ya scallywag! Be sure t' align t' fins! I didn't come up with any method o' doin' this, I eyeballed them and they came out fine.

Construction Rating: 4 out o' 5

Rocket PicFlight:
Just like t' Ultimate Endeavor's two little brothers, me bucko, me hearties, this kit is nothing short o' awesome in t' air. Aye aye! It is very stable and produces good, me hearties, straight flights. T' first flight be with a K550. Blimey! Ahoy! This be me L2 cert flight and attained an altitude o' 2988'. Arrr! Second flight was on a K550 as well and reached 3074' (less wind). Avast! On these two flights, I used apogee ejection only. Blimey! This was accomplished with an adept ALTS2 and motor backup. Ya scallywag! For a third back up system, I installed a missile works wrc2. Avast, me proud beauty! Well, blow me down! Yes I am paranoid! I have seen big rockets crash into spectator areas, so I take all precautions. Avast, me proud beauty! Besides, after filling all those seams, you don't want t' redo any o' t' airframe.

Recovery:
I HATE PISTONS. In theory, they are wonderful but thar are too many potential problems. Well, shiver me timbers, blow me down! Blimey! If t' piston doesn't have a good seal t' t' airframe, ya bilge rat, ejection gasses will pass by and nay be sufficient t' separate t' two halves. Aye aye! Blimey! If the piston gets stuck, you'll either blow a hole in t' airframe or just have a bunch o' compressed gas under t' piston, shiver me timbers, neither o' which will result in a good deployment. Blimey! Blimey! Blimey! Blimey! So, arrr, away with t' piston! Blimey!

Now that t' piston is gone, ya bilge rat, two parachutes is a problem. Avast, me proud beauty! I have tried this design in t' past and had problems gettin' t' booster chute out. Avast, me proud beauty! Aye aye! If deployment is after apogee, your chances o' gettin' t' bottom chute to "fall" out o' t' airframe are slim. With t' piston, shiver me timbers, matey, this would work fine, but without t' piston, arrr, I didn't want t' test me luck. I chose t' use a single 8' chute for t' rocket, me bucko, a little big, but good when you are bringing the rocket down on rocks. Blimey! I also wanted t' set t' rocket up for dual deployment, matey, so I used t' parts from t' piston t' creat a "lid" on top o' t' coupler t' house electronics. Avast! Ahoy! By housin' t' main chute above the split and electronics in t' middle, ya bilge rat, you move t' cg forward which is really good for clustered flights.

Second, arrr, me hearties, me hearties, THROW AWAY THE ELASTIC SHOCK CORDS! Blimey! I know PML considers them t' be adequate, matey, shiver me timbers, but do you want t' trust a rocket that is this big t' elastic? If you do you are crazy. I used tubular nylon for t' shock cord. Ahoy! Blimey! I also used "U" bolts t' anchor t' recovery system. Avast! Blimey!

Flight Rating: 4 out o' 5

Summary:
Overall this is a good kit. I think PML should reconsider t' recovery system. T' cost o' t' piston, elastic shock cords and parachutes is figured into the price o' t' kit and I didn't use any o' them. Fortunately, shiver me timbers, I had the replacement parts already, arrr, so it didn't cost me any extra. Aye aye! Other than recovery items this rocket is well worth t' loot. Arrr! It is awesome in flight and will turn quite a few heads at t' launches. Avast! Well, blow me down! I am gettin' ready t' rebuild the booster t' hold 3" motors. I am upgradin' t' fins t' be 1/8" so the M1315 can be used. Aye aye!

Overall Rating: 4 out o' 5

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