North Coast Rocketry Bomarc

North Coast Rocketry - Bomarc {Kit}

Contributed by Jeff Brundt

Construction Rating: starstarstarstar_borderstar_border
Flight Rating: starstarstarstarstar
Overall Rating: starstarstarstarstar_border
Manufacturer: North Coast Rocketry

Rocket PicI bought this rocket this past summer as a birthday gift t' myself. Well, blow me down! Begad! I finally got around t' buildin' it last month. I knew what I be in for when I got it. Avast, me proud beauty! Arrr! I had read all t' reviews and comments posted on t' newsgroup as well as here on Essence. Begad! Begad! T' first thin' I did away with be t' vacuum formed skins. I prefer nay t' work with this if at all possible. Aye aye! T' nacelles would be hard enough but skinnin' t' wings with this stuff was nay an option for me. Avast! I bought a piece o' 1/64 veneer ply 12"x 24" and this was enough t' cover all t' flyin' surfaces. Aye aye! T' balsa framework structure be t' same as per t' plan sheet and t' 1/64 ply be t' same thickness as t' plastic. Avast, me proud beauty! Well, blow me down! After assembly t' leadin' edges were then shaped for better aerodynamics.

T' next change be how t' nacelles were mounted. Blimey! Well, blow me down! I heard o' t' stories o' ejection blowin' them out and how flimsy t' mountin' be on landing. Arrr! T' fix this I moved t' forward bulkhead t' a point just ahead o' where t' nacelle supports come through t' body tube. Ya scallywag! Avast! I used a LOC motor tube coupled t' t' supplied NCR motor tube t' extend t' where t' forward bulkhead would now be. Blimey! T' nacelle pylons would now go through t' body tube and mount directly t' t' NCR supplied motor tube. Ya scallywag! Ya scallywag! This is a very strong mount and makes sure no ejection blowby occurs.

Another weak spot was t' joint betwixt t' rudder and t' horizontal stab. Ya scallywag! Blimey! This joint is only a butt joint and nay very strong since thar be minimal surface area t' join. Ahoy! Avast! Blimey! Even with an epoxy fillet. Well, blow me down! T' remedy this I used several short pieces o' bamboo skewers inserted into t' base o' t' rudder then thru t' stab and body tube all t' way t' (but nay thru) t' motor tube. Ahoy! This is now a very nice, ya bilge rat, strong joint.

I did replace t' shock cord mount with regular 1/16 aircraft cable since t' one supplied by NCR seemed too small for me liking. Aye aye! Aye aye! I needed t' add about 8oz o' weight t' t' nose. Begad! Avast! For this I used copper BB's and some 30 minute epoxy. Begad! This mass is held in place by bamboo skewers cross drilled thru t' nose cone tip with t' BB's added then t' epoxy poured in. Blimey! This method is preferable t' me rather than usin' t' clay supplied with t' kit. Blimey! T' model is balanced t' handle up t' a H180 motor. T' supplied NCR motor retainer was discarded in favor o' APIs machined motor retainer (see me Saturn 1b article). Begad! T' NCR retainer will nay work with reloadable motors, matey, shiver me timbers, ya bilge rat, which is what I intend t' use for this model.

T' model is now a true high power bird. Avast, me proud beauty! Aye aye! After sanding, sealin' and preppin' I finished t' Bomarc as per t' diagrams shown in t' instructions. T' finished weight, arrr, without motor, ya bilge rat, was 44oz. Ya scallywag! I modeled t' flights usin' win-roc and found t' G75-6 and H128-6 were t' best suited motors. Ya scallywag! Arrr! (the model also flies on AT G64-4 reloads) First flight was on an AT G75-6. T' model boosted straight with a slight roll. Aye aye! Blimey! At apogee it arced over and flew flat for a second or so then t' ejection went off and deployed t' chutes. Ahoy! T' main body came down on a single 36" chute while t' nose recovered separately on a 24" chute. Arrr! I opted nay t' use t' supplied chutes from NCR since me recovery method was goin' t' be two separate pieces. Aye aye! I also used Pratt's 1/8 tubular Keelhaul®©™ instead o' t' NCR supplied elastic. (elastic is a no-no for me now)

In t' final analysis, me bucko, shiver me timbers, while this is a nice kit and a great size t' build, per t' instructions and with materials supplied it yields a rocket nay quite up t' high or mid power standards. T' be fair most high power fliers have certain methods and techniques that work for them and kit suppliers cannot meet all those needs. Ya scallywag! Ya scallywag! Blimey! But in me opinion, me hearties, at t' price charged for this kit, me hearties, (retail $89) thar could have been better ways t' achieve a fine model without so much extra work. Avast! Begad! Blimey! If you can find this kit for a good deal ($40 or less) then I would say buy it and incorporate t' mods I made. Aye aye! You will have a nice flyin' and great lookin' scale model. I can say it was a real crowd pleaser at our last launch.

As for ratings.......

Construction 3 . Arrr! . Begad! Aye aye! . mostly due t' vaccu-form parts and need for mods t' improve survivabilty

Flight/Recovery 5 . Begad! . . Well, blow me down! excellent flight (keep in mind t' add necessary nose weight for stabilty)

Overall 4 . Avast! . Aye aye! . Begad! I like t' looks and impressive size o' this model. Ahoy! Well, blow me down! However, t' user mods required does nay make it suitable for everyone.

 

 

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