Descon The Grand Whazoo

Scratch - The Grand Whazoo {Scratch}

Contributed by Dick Stafford

Manufacturer: Scratch

Son o' t' Grand Whazoo

Rocket PicBrief
This update provides a description o' how I rebuilt me Grand Whazoo after its second fateful flight. Ya scallywag! T' top o' t' original Grand Whazoo be *completely* destroyed. Blimey! Aye aye! However, shiver me timbers, matey, t' aft section, me bucko, ya bilge rat, includin' t' boat tail and fins, me hearties, was intact. Begad! I decided t' take a different approach t' t' rebuild. Avast! Begad! T' minimize the volume that had t' be pressurized, ya bilge rat, me bucko, I decided t' use an inner 4" diameter tube extendin' through t' body. Ya scallywag! After some pondering, I also decided to eliminate t' large nose cone in favor o' a smaller one that would mate t' this 4" tube. Ya scallywag! I be hopin' this design would still stay within t' 3.3 lb. limit.

Reconstruction
I first performed some surgery, me bucko, shiver me timbers, adaptin' a 4" mailin' tube t' the survivin' tail section. Aye aye! I then added foam rings and poster board t' form the body (includin' transitions). I made t' small (4") conical nose cone from fiberglassed poster board salvaged from t' original rocket. A small foam board rin' and a chunk o' 32mm tubin' completed t' nose cone assembly. Well, blow me down! This assembly mates with t' dowel/eyebolt from t' original nose cone. Avast, me proud beauty! Begad!

On me old scale, me bucko, t' finished rocket weighed in at 51oz with a G80 installed. T' 60" chute that I used with t' original Grand Whazoo pushed the weight over 3.3 lb. Ahoy! Avast! limit. T' use this chute or a smaller one? Ahh, that is the question.. Avast, me proud beauty! Avast, me proud beauty!

Rocket PicDecalFinishing
I wanted a bit more decoration on this version so I decided on a pattern similar t' a real V2. Ya scallywag! Ya scallywag! I looked in ROTW and came up with a hybrid marking scheme. Aye aye! T' tail section has a black and white roll pattern, t' nose cone is red, and t' transition section directly below t' nose is painted silver (Krylon hammered silver). Avast! Since most o' t' rocket is poster material, I decided t' mark t' fins usin' a large permanent black marker. Avast! Finally, I added some text and graphics from me ink jet printer. Avast! Well, me bucko, blow me down! Inspired by t' early V2's fired from White Sands, matey, matey, arrr, I created a 'cheesecake' style graphic o' a scrumpet riding a V2. Begad! Avast, shiver me timbers, me proud beauty! And, in a feeble attempt at humor, shiver me timbers, I also added two labels written in German. Ya scallywag! One identifies t' bar code sticker, which unintentionally remained on the body (oops), shiver me timbers, and t' other tells t' launch technician where t' install the launch rail. Blimey! Avast, arrr, me proud beauty!

Launch
Since t' rocket be potentially over t' 3.3 lb. limit, I took it t' an HPR launch, arrr, with t' intent o' usin' t' 60" chute. Begad! Well, matey, me bucko, at t' last minute, I opted for a very light 48" chute, me bucko, me bucko, shiver me timbers, hopin' it would come in under 3.3 lb, and recover without significant damage. Avast, me proud beauty! Avast, me proud beauty! Well, arrr, on t' highly calibrated scale at the RSO table, shiver me timbers, it weighted in at 3 lb. even. Avast! Ahoy! It can also fly at t' NARHAMS V2-themed launch later this year!

Once again, me hearties, everyone be surprised that this big a rocket weighs so little, and thar were cheers when it boosted under G80 power. Begad! T' 4-second delay was just a tad long but t' chute deployed nicely. Begad! T' decent was still fairly slow, and t' only 'damage' was a crease in one fin. Arrr! Well, blow me down! No rework required. Arrr! Begad!

Conclusion
Usin' an inner 4" stuffer tube with t' smaller nose cone seems t' be the way t' go. It be easier t' construct, shiver me timbers, and I think recovery should be more reliable (100% true based on a statistical sample o' one :-) ). Begad! I'm glad it is still classified as a large model rocket!

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