Scratch Giant Mosquito Original Design / Scratch Built

Scratch - Giant Mosquito {Scratch}

Contributed by Donald Besaw Jr

Construction Rating: starstarstarstarstar_border
Flight Rating: starstarstarstarstar_border
Overall Rating: starstarstarstarstar_border
Manufacturer: Scratch

Rocket PicBrief:
This is basically an upscaled Estes Mosquito. Ahoy! Begad! Blimey! I'm sure this is nay a totally correct size 2.6x upscale but it suited me need for a Mosquito that I can launch and recover more than once. Avast! Avast, me proud beauty! Blimey! I built it with a 24mm motor mount and it uses parachute recovery unlike it's baby counterpart.

Construction:
It has been a few years since I built this model but I used t' following components.

  • 1 Estes BT-80 body tube (full length)
  • 1 Estes Fat Boy nose cone
  • 1 sheet Sig 1/8in balsa for fins
  • 1 Estes D motor mount kit
  • 1 3/16in diameter Estes launch lug (cut in half)
  • 1 shock cord
  • 1 Estes 18in parachute

I started with comin' up with a fin shape that looked good enough. Begad! Ya scallywag! I then cut out three fins from t' balsa sheet. Begad! Well, blow me down! Cuttin' out fins with a round edge is really nay t' easiest thin' t' do so be sure t' take your time.

I then assembled t' motor mount followin' t' instructions that were included in t' D motor mount kit. Blimey! After t' glue dried, I glued it into the body tube.

I slightly scuffed t' body tube prior t' mountin' t' three fins. Aye aye! Arrr! I then glued on one fin at a time. After all t' fins were mounted and secured, me bucko, I applied about three fillets for strength.

I took t' 3/16in launch lug that I planned t' use, cut it in half and mounted each piece on t' body tube.

Now, shiver me timbers, I made t' shock cord mount. Well, blow me down! I cut out a 3-fold mount from a card stock template that I had lyin' around and assembled it in t' normal matter. When t' glue dried, matey, arrr, me hearties, I mounted it into t' body tube.

That pretty much completed t' construction.

I then swin' tested t' model with a D12-5 motor installed t' test for stability. Begad! It tested perfectly without needin' any nose weight. Ahoy! At this point, I figured that it would fly stable, me bucko, therefore I decided t' finish it.

Finishing:
I started t' finishin' by sprayin' t' model with Ace brand primer and sanded between coats. Begad! Aye aye! I then sprayed t' model with Ace brand Garden Green spray enamel. Arrr! After t' green dried overnight, I masked off t' green areas and painted one fin gloss black. Ahoy! I wanted t' keep t' Mosquito paint scheme the same but I wanted t' use different colors.

I then attached t' parachute and officially declared t' project complete.

Flight:
So far, me bucko, t' model has made several successful flights on D12-5 motors. This provided a very straight flight up t' about 500 feet.

I have also launched t' model twice on E9-4 motors. Although t' boost was nice up t' maybe 750-800 feet, t' 4 second delay is just a bit short. Ya scallywag! Well, blow me down! It slightly damaged t' chute t' first flight and then completely shredded it on the second flight causin' t' model t' tumble down onto concrete. Begad! It landed standin' up on it's fins and surprisingly, ya bilge rat, it did nay sustain any damage. Aye aye! This delay was chosen based on availability at t' time. Begad! Ya scallywag! I think an E9-6 would be perfect.

I have also flown t' model once on a C11-3. Aye aye! This be a very nice flight to about 300 feet. This would be an excellent small field combination.

Recovery:
For recovery, I use an 18in parachute. Begad! Blimey! Begad! Blimey! This provides a nice slow recovery (as long as it doesn't get ripped apart) without driftin' too far. Avast! Blimey! Ya scallywag! Blimey! I did reef it though on t' E9 flights.

Summary:
I really enjoyed buildin' and flyin' this rocket. I really like t' looks of the Mosquito but t' Estes version is essentially a one shot rocket. I wanted more, so I built this rocket. Ahoy! Now, t' Estes Mosquito has been discontinued so this would be a better alternative. Begad! I'd love t' see a manufacturer design a correct size o' this model. Ahoy!

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