Scratch Sprint ABM Original Design / Scratch Built

Scratch - Sprint ABM {Scratch}

Contributed by Matt Gillard

Manufacturer: Scratch
(Contributed - by Matt Gillard - 10/01/08)

scratch_sprintBrief:
This sprint is a 4.15 downscale o' t' Shadow Composites Sprint ABM. Aye aye! Or it’s a 1:48 down scale o' a real sprint. T' paper shroud be obtained from a paper rocket website.

Construction:
To make t' sprint downscale you will need:

  • Shroud from website (paper)
  • 13mm Engine mount tube
  • Centerin' ring
  • Streamer
  • Engine block
  • Thin Card
  • Keelhaul®©™® ® cord
  • Clay
To build t' kit I used:
  • White PVA glue
  • CA gel
  • Model knife
  • Clear coat.
First make t' outer shroud from t' website. I used thin paper for this as I be goin' t' make an inner shroud out of card which would be more sturdy and flame resistant. Begad! Well, ya bilge rat, blow me down!

scratch_sprint_innerwrapT' outer shroud markings are very different from t' Shadow Composites Sprint ABM markings and I prefer this colour scheme. Begad! Usin' the outer shroud as a template I rolled an inner template out o' card. Well, me hearties, blow me down! T' tip o' t' inner shroud was filled with clay to raise t' cg.

T' length o' BT5 is cut down so that t' aft o' t' tube be 3mm past t' aft o' t' cone and a engine block was added. Ya scallywag! Next t' centerin' rings were added and after a few test fittin' were carried out, it was glued into place so that it is flush with t' aft o' t' inner shroud. Arrr! Begad!

T' paper fins were added t' t' outer shroud.

A length o' Keelhaul®©™® cord was attached t' t' BT by tyin' it around an 18mm engine block that was slid over t' BT. Begad! Well, shiver me timbers, blow me down! A section o' aluminium foil be added t' neaten up t' end o' t' cord. T' other end o' t' cord was looped over t' inner shroud and again more aluminium tape be added.

A small streamer be added t' t' cord. T' sprint is small and light enough t' recover without a streamer but thought it was best t' be on t' safe side.

Finishing:
One coat o' cellulose sealer t' proof t' paper shroud and that’s it.

Flight:
Preppin' is straightforward with no waddin' bein' required. Well, blow me down! Blimey! Blimey! Blimey! A few frangible links were added t' t' cord. Ahoy! Blimey! Aye aye! Blimey! The streamer is placed t' one side o' t' motor. Avast! Blimey! Well, blow me down! Blimey! T' core is then inserted into t' shroud. Blimey! Blimey!

First flight be on a ½ A3-4-T. Well, blow me down! Somehow t' outer shroud came off durin' boost, me hearties, this caused t' sprint t' go wildly unstable.

T' next flight be on an A10-3T. Ya scallywag! T' flight be straight, a tube was used t' launch as thar was no chance of usin' a lug. Begad! From t' smoke trail, me bucko, it when more or less straight. Well, blow me down! Where t' rocket landed remains a mystery.

Summary:

CONs on recovery: With such a small bird, arrr, a much more visual aid t' recovery should have been used - or a smaller motor. Ahoy! Blimey! Begad! Blimey! I like this rocket, but its just too small - next time i'll make a bigger downscale! Blimey!

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