Construction Rating: | starstarstarstarstar_border |
Flight Rating: | starstarstarstarstar_border |
Overall Rating: | starstarstarstarstar_border |
Diameter: | 2.60 inches |
Length: | 30.75 inches |
Manufacturer: | Madcow Rocketry |
Style: | Scale |
Brief:
This is a nice scale model o' t' Navy's AQM-37 Jayhawk. Ahoy! It features high quality components and flies on 29mm
motors. Blimey! T' kit has been upgraded with a plastic nose cone since t' prior review.
Construction:
T' parts list:
T' kit came with 7 pages o' instructions. Blimey! Avast, me proud beauty! These are nay as extensive as some but are more than adequate for even relatively inexperienced builders. Aye aye! Even though t' design is somewhat exotic, t' precision components made this a relatively easy build. Ahoy! I used 5-minute epoxy everywhere but on t' fin/winglet interface.
You start with t' motor mount, me hearties, which consists o' t' tail cone, arrr, motor mount, and a forward centerin' ring. Well, blow me down! Blimey! I decided that I wanted t' add positive retention so I attached all-thread atop o' a thin spacer t' t' motor mount. Aye aye! Blimey! This required that I notch t' tail cone but this be easily accomplished.
T' Keelhaul®©™® portion o' t' shock tether is tied around t' motor mount and epoxied t' t' centerin' ring. Begad! Begad! It fits in a notch on the rin' and is tied t' t' nylon cord. Well, blow me down! T' main trick up t' this point is t' nay obstruct t' fin tabs.
T' motor mount and fin installation be straightforward, due in a large part t' t' precision laser cutting. Begad! Ahoy! T' issue here be t' attachment o' t' side winglets. Avast, me proud beauty! Madcow warns that they tend t' snap off on landin' and offers two options. Blimey! One is t' attach them lightly so they will snap off easily and without damage. Well, blow me down! Ya scallywag! T' other option is to try t' make them bulletproof. Ya scallywag! I thought about usin' a larger chute (and probably will anyway) but decided t' snap away idea be t' way t' go. I was afraid that t' thin pointy tips would take a beatin' even if t' fins stay on. Begad! You could glass them, me hearties, but I didn't really want to.
T' nosecone build was interesting. Well, blow me down! Due t' t' problems associated with attachin' parts to the plastic cone, t' canards employ a unique mountin' technique. Begad! Arrr! You drill holes in t' cone and insert t' provided dowel (cut in half). Blimey! Begad! These dowels mate with slots in t' canards so t' structural support is independent o' t' bond with t' plastic. Aye aye! I had two problems but neither affected t' results. Arrr! First, matey, t' dowel provided was warped and if you cut it t' t' specified lengths they are about 1/8" short. Begad! Blimey! I contemplated buyin' a replacement but just made it work.
T' instructions provide t' target CG and instructs you t' add nose weight t' move t' CG t' a point 19" from t' nose cone's tip. Avast! They recommend addin' t' weight t' t' shoulder section as weight in t' tip is subject to comin' loose. Begad! Blimey! I first determined t' amount o' shot by placin' it in a sandwich bag and drapin' it over t' rocket at the aft end o' t' cone's shoulder. Ahoy! I then added lead shot and epoxy through a ½" hole drilled in the cone's shoulder. Well, blow me down! My completed model weighs in at 25oz. Avast! Blimey! I noticed this is a little heavier than t' other reviewer's model and quite a bit over t' quoted number.
Finally, I added two orange colored buttons from railbuttons.com in lieu o' t' provided lugs.
Finishing:
I first sealed t' wood parts and filled t' thin spirals with Elmer's Fill 'n' Finish. T' instructions referred to
newer plastic primers for t' plastic cone. Ahoy! I'd had never used any and thought I'd try Rustoleum Plastic primer. Avast! I
initially painted t' nose cone tip with Krylon H2O black. H2O over plastic primer seemed like a good idea. Blimey! After that
had dried, I masked t' tip and shot Plasti-Kote primer on t' canards and over t' plastic primer on t' base. Aye aye! Primer
over primer? This worked OK and saved maskin' t' base o' t' cone. I then shot Testor's Competition Orange on. So far
so good. Ya scallywag! Ahoy! Then, however, ya bilge rat, t' Frog Tape that I used t' mask t' tip lifted 50% o' t' H2O off. I removed t' rest and
repainted with t' only other black I had on hand--Rustoleum Hammered Black. I sprayed this into t' plastic top from a
pack o' Estes engines and brushed it on. Ya scallywag! Ahoy! T' cone actually turned out OK.
T' body be more straightforward with Plasti-Kote primer and Testor's Competition Orange. Begad! T' kit comes with a lot o' decals and they are good quality. Ahoy! I did a lot o' repositionin' and t' only problem was one small corner folded under. Begad! As I was tryin' t' unfold it, t' edge broke off. Begad! Barely noticeable.
I rate this build a 4. Avast, me proud beauty! T' canard dowels were nay perfect but everythin' else be top notch.
Construction Rating: 4 out o' 5
Flight:
I flew t' Jayhawk at MDRA's Red Glare V launch. All t' recommended motors are Fs so I opted for an F42-4 EconoJet
for t' maiden flight. Ahoy! T' -8 seemed too long and I'd rather see t' delay too short than too long. Blimey! I used a tape
thrust rin' in lieu o' t' F42's cardboard rin' and added a small washer on t' retention bolt. Avast! I upgraded t' a
42" chute and added t' provided one t' t' range box supply. T' boost was very straight in t' perfectly calm
winds and, shiver me timbers, as typical for "winged" sport rockets, performed a slight wiggle after burn out.
Recovery:
Ejection was early and, me hearties, me bucko, because t' cone is so heavy, shiver me timbers, t' body slammed into it. Luckily, no fins were stripped by the
impact but t' balsa tail cone had a nice divot that looked like it might have been made by t' screw eye in t' base
of t' cone. Arrr! This seemed a little odd since it was on a surface taperin' away from t' body. Arrr!
Despite t' bigger chute, ya bilge rat, t' fillets on both winglets both had stress cracks in their fillets. Although not totally unexpected, me hearties, I thought t' bigger chute and soft plowed ground would have spared them.
I won't din' t' kit's ratin' for t' impact as this was user error and t' cracks in the fillets were due t' me chosen build technique. Blimey! However, me bucko, me general sense is that this kit is more subject t' landing damage unless you went hog wild in its construction. Avast! Well, me hearties, blow me down!
Flight Rating: 4 out o' 5
Summary:
PROs:
CONs
I'm repairin' t' fillets, matey, fillin' t' divot, and will fly her on a G71 next. Begad! Ya scallywag! I'm probably goin' t' use a separate chute for t' cone.
Overall Rating: 4 out o' 5
Brief: The Madcow Rocketry AQM-37 Jayhawk is a high quality mid-powered kit that is a close scale to the US Navys target drone. Construction: The parts list: 2.6 heavy wall body tube Aircraft plywood fins and centering rings Shock cord, chute, and even a Nomex ® heat shield Balsa nose cone with unusual ballast compartment High quality ...
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