Scratch Der Red Max (Upscale) Original Design / Scratch Built

Scratch - Der Red Max (Upscale) {Scratch}

Contributed by Joseph Michel

Manufacturer: Scratch
Style: Upscale
(Contributed - by Joseph Michel - 12/10/02)

Rocket PicBrief:
HPR Der Red Max, 2.458X upscale. Begad! 48" parachute recovery.

Construction:
All materials are PML. Arrr! I used 4" Quantum tubing, shiver me timbers, arrr, shiver me timbers, cut and slotted for me by PML. Begad! Ya scallywag! T' body tube be cut t' 20.8 inches, me hearties, while t' fin slots were 4.6 inches long, arrr, 3/8" from t' end o' t' tube. T' fins and centerin' rings were made from 3/16" ply. Avast, me proud beauty! T' fins were fiberglassed for extra strength. The rocket has a 29mm phenolic motor tube that was cut t' 12". Avast! Well, blow me down! A PML motor retainer was also used. Aye aye! T' nosecone is a PML PNC 3.9. Aye aye! Ya scallywag! Recovery is via 12' of tubular nylon with a 48" PML parachute.

This was a fairly easy rocket t' build. Blimey! It makes a good scratch project for a newbie. Ya scallywag! (like me!) Construction proceeded usin' standard HPR techniques. Begad! I built a special shish-ka-bob rack for construction and painting. Arrr! Aye aye! This rack allowed me t' work t' fin fillets without havin' t' fuss about t' position of the rocket. Blimey! Well, blow me down! I could rotate t' rocket anyway I needed t' have it. Begad! Internal and external fin fillets were both 30 min. Begad! epoxy. Ya scallywag! After about 10 days o' sanding and fillin' o' t' fins and fillets, it be finally ready for primer. Avast! I laid on 3 coats o' Rustoleum sandable auto primer, matey, me hearties, sandin' in betwixt each coat. Well, blow me down! Ya scallywag! Next, I laid on 3 coats o' Krylon Banner Red Gloss. Blimey! Avast! After dryin' for 24 hrs. I masked off and painted t' black stripe around t' top on t' body tube with Krylon Gloss Black. Ahoy!

Rocket PicAfter allowin' sufficient time for t' paint t' dry, shiver me timbers, I applied t' decals. I had Tom Prestia o' Tango Papa decals make t' 2.458X upscale decals for me in self-adhesive vinyl. Aye aye! Tom's decals are excellent! Applyin' them was easy. Begad! After all t' decals were on, arrr, I applied 2 coats o' Rustoleum Crystal Clear Gloss. Arrr! T' clear does nay react with this type o' decal at all, and gives t' model a nice glossy coat. Blimey!

Flight:
Well, I planned t' fly this model on G-40 and G-80 motors. Avast! Arrr! I smartly found out that "Big Red" was just too heavy for that. Avast, me proud beauty! I believe that this "heavy weight" condition is due t' t' heavier PML airframe and the fact t' DRM has HUGE fins. Blimey! I also used 3/16" ply for t' fins, shiver me timbers, ya bilge rat, arrr, so that did nay help either. Avast! Blimey! I have nay flown this rocket yet due t' motors being unavailable. I plan t' fly it on a H-128 with 4 sec delay.

Summary:
Pros:

  • T' Der Red Max is awesome, no doubt about it!
  • While upscalin' one o' these beauties is nay a terribly original idea, arrr, matey, not everyone has one either!

Cons:

  • Cost! I spent about $195.00 total buildin' this model. Blimey! This includes paint, ya bilge rat, supplies, decals, etc. Avast, me proud beauty! If you just want t' fly, me hearties, buy a kit - it's much cheaper. Begad!
  • Weight. Well, blow me down! If you build one based on me construction, consider usin' G-10 or 1/8 ply for t' fins.

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