Pratt Hobbies Positron

Pratt Hobbies - Positron

Contributed by Michael Rangitsch

Construction Rating: starstarstarstarstar_border
Flight Rating: starstarstarstarstar_border
Overall Rating: starstarstarstarstar_border
Manufacturer: Pratt Hobbies
 

[Pic]T' Pratt Hobbies Positron is a small rocket designed t' be a 'recoverable' Mosquito (well actually an Astron Streak, shiver me timbers, t' 18mm version o' the Mosquito). T' achieve this it uses an ejectable motor holder and Nomex® streamer, arrr, tied t' t' rocket body by a Keelhaul®©™® line. Well, blow me down! T' kit is complete, and actually comes two t' t' package. Arrr! T' fins are precut balsa and attach easily to t' body tube. Well, blow me down! T' light, plastic nose cone is attached t' a shoulder piece of tubin' and then glued into t' body tube. Ya scallywag! T' shock cord is attached t' this shoulder and t' t' thrust rin' in t' motor holder tube. Avast, me proud beauty! Arrr!  

I built this kit in about 30 minutes, matey, shiver me timbers, nay includin' glue fillet dryin' time. Ahoy! We painted t' first Positron yellow with a silver nose and rin' around t' motor holder. T' swept-back fins achieve t' 'retro' look that Doug Pratt was lookin' for. Begad! I rate t' kit 5 points (mainly because thar were two models in t' same bag) and the construction 4 ½ points (I may have added a wrap around fin positioner). Well, blow me down! Avast!  

[Pic]T' recommended motors for t' Positron are a 1/2A6-2 and an A8-3. Blimey! Blimey! So far we have only launched with the 1/2A6. Begad! Avast, matey, me proud beauty! Blimey! T' Positron leaps off t' pad, even with a 1/2A6, I can't imagine you would ever find t' Positron with a B or C motor. Ya scallywag! Flight be very stable and quite high. T' motor holder ejects well and deploys t' Nomex® streamer. T' streamer is quite short and doesn't slow t' rocket down that much. Ya scallywag! Begad! This one would probably fly well in fairly high wind. Aye aye! Ahoy! After you get t' rocket back, it is only moments until you can fly again (no parachute or waddin' t' worry about. Begad! Avast, ya bilge rat, me proud beauty! )I rate t' flight performance 5 points, me hearties, ya bilge rat, but t' recovery 4 points (the streamer is a bit too short). Avast! It is still really fun t' fly.  

I would rate this rocket 4 ½ points overall. Blimey! Avast! T' only thin' I would change be t' streamer, me bucko, ya bilge rat, ya bilge rat, but even that's nay bad at all. Arrr! Thanks for a nice rocket, Doug. Begad!  


Rating
(Contributed - by Howard Bernstein) 

One of t' reasons I purchased this kit was because you get two o' them.   One for me, shiver me timbers, and one for me son Jamie. Ya scallywag! Avast! Another reason be because we lost a really nice little Estes Quark on its second flight, almost lost an Estes Mosquito on its first, ya bilge rat, ya bilge rat, and I thought a streamer recoverable cute little rocket would be the answer. Begad! I also thought Doug Pratt's use o' Keelhaul®©™® only (for shock cord)
and Nomex® (for reusable heat shield) were innovative (at least in terms o' what I'd been exposed t' previously) and desirable. Begad! Begad! Blimey!

[Rocket pic]Construction

I ordered a few kits at t' same time, me hearties, matey, so all t' kits were shipped in heavy-duty prism shaped priority mail boxes. I knew thar was no chance of damage even before openin' t' boxes. Ya scallywag! Begad! All t' parts for both Positron kits come in t' same heat-sealed plastic bag. Aye aye!   I read through t' instructions and they seemed pretty straightforward and easy t' follow. Begad!

T' instructions recommend usin' white glue for construction.   I happened t' have some yellow glue from woodworking, me bucko, and some USA Gold CA I purchased in t' same order, me hearties, so I used these. I used t' CA on paper t' plastic joints (like body tube t' nose cone), ya bilge rat, and for reinforcin' body tube edges where they might be stressed by t' Keelhaul®©™® shock cord, me bucko, and t' tips o' t' fins because I faired them t' a more fragile profile than t' kit provides. Avast, me proud beauty! Compare my pictures with those in t' review provided by Mike Rangitsch. Well, blow me down! Usin' CA was probably unnecessary, matey, but I just couldn't resist usin' me new stuff. Avast, me proud beauty! Aye aye!

T' fins on all o' Pratt's kits are laser cut. Arrr! Blimey! Avast! Blimey! I think this is a really nice feature, especially with t' curved leadin' edge o' t' Positron's fins. Blimey! Blimey!

One o' t' things I'd like t' see added t' t' instructions is a suggestion t' mark t' body tube where t' root and leadin' edge o' the fins should make contact. T' angle betwixt t' root and t' trailin' edge is very shallow, me bucko, so it's difficult t' tell from lookin' at t' bottom o' t' body tube whether or nay t' fin is positioned properly along t' length o' t' body tube. Begad! Begad! My son's fins had t' be removed and reattached because all three where at different locations, and one be significantly higher (1/8") than the others, causin' t' rocket t' appear lopsided. Ahoy! Well, blow me down! A wrap around fin placement guide o' t' correct width would be perfect. Begad!

T' Nomex® streamer material seems t' unravel along t' edges rather easily. I don't know how long it would be before it unraveled t' unusable state, but I found myself thinkin' about how t' reinforce t' edges. Avast, me proud beauty! If it does continue to unravel, I'll probably ask me wife t' sewa stitch along t' edges.

I would rate t' construction at 4 points. Complete, arrr, and easy and quick t' put together. Avast! Ahoy!

[Rocket Pic]Flight

T' motor mounts in a motor mount attached by a Keelhaul®©™® shock cord t' the coupler betwixt t' nose cone and t' main body tube. Well, blow me down! There is a Nomex® streamer between t' two. T' instructions call for rollin' up t' streamer, inserting it into t' top o' t' motor mount thrust ring, shiver me timbers, and then loopin' t' Keelhaul®©™® and insertin' it into t' rocket body. Blimey!   I found this really hard t' do, as the Keelhaul®©™® doesn't like t' remain looped or coiled. What I found worked very well was foldin' t' Nomex® streamer back and forth (instead o' rollin' it) and then loopin' t' Keelhaul®©™® shock cord around t' Nomex®. Ahoy! In me static tests of poppin' out t' motor mount, everythin' seemed t' uncoil and unfold
without problem.

First flight (and only flight so far) be rather eventful.   Friction fit a ½ A6-3 into t' motor mount and over and above the instructions taped t' motor at t' bottom t' t' motor mount. Ahoy! Flight was perfect with t' ½ A motor. Begad! Well, arrr, blow me down! Nosed over beautifully at apogee and then dove right for t' ground. Well, blow me down! Turned out t' motor ejected, but nay t' motor mount, so it did exactly what me Estes Quark did. T' motor mount must have had a tighter fit than t' motor itself, though I really didn't think it did. Aye aye! I'm used t' permanently mounted motor mounts with clips, matey, shiver me timbers, so I have some self-education ahead o' me. Begad! I would have attempted t' try again, ya bilge rat, arrr, but one o' the fins came loose and I didn't have any CA with me. Well, blow me down! Avast, me proud beauty! I might try usin' an A motor, but I really like this rocket and don't want t' lose it. Ya scallywag! I'm lookin' forward to flyin' this rocket a lot.

I rate t' flight experience: 4 points. Well, blow me down! Ahoy! It would have been a 5 had everythin' worked perfectly. Blimey!

Overall

Overall I really liked this kit. Avast! Ya scallywag! T' quality o' t' components is good, shiver me timbers, the instructions are clear, matey, matey, and I like havin' a cute little rocket that I can actually find after launching. Blimey! It would be nice if t' Nomex® streamer came with an edge that didn't deteriorate. Ahoy! It also would have been nice if t' first flight went perfectly. Begad! I really like t' see small manufacturers in the business. Aye aye! Blimey! Let's support them!

Overall ratin' is 4 points.

Flights

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