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. Begad! Avast, me hearties, me proud beauty! T' top o' t' original Grand Whazoo be *completely* destroyed. Avast! Ya scallywag! However, shiver me timbers, t' aft section, me bucko, includin' t' boat tail and fins, me bucko, shiver me timbers, was intact. Ya scallywag! I decided t' take a different approach t' t' rebuild. Begad! Ya scallywag! T' minimize the volume that had t' be pressurized, matey, I decided t' use an inner 4" diameter tube extendin' through t' body. Aye aye! After some pondering, me hearties, I also decided to eliminate t' large nose cone in favor o' a smaller one that would mate t' this 4" tube. I was hopin' this design would still stay within t' 3.3 lb. limit. Avast! Well, blow me down!

Reconstruction
I first performed some surgery, ya bilge rat, adaptin' a 4" mailin' tube t' the survivin' tail section. Blimey! 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. Avast! Avast! A small foam board rin' and a chunk o' 32mm tubin' completed t' nose cone assembly. Avast, me proud beauty! This assembly mates with t' dowel/eyebolt from t' original nose cone. Arrr! Well, arrr, blow me down!

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

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

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

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

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

comment Post a Comment