Scratch The Avenger Original Design / Scratch Built

Scratch - The Avenger {Scratch}

Contributed by Douglas Gardei

Manufacturer: Scratch
(Contributed - by Douglas Gardei - 06/28/08)

Instructions

Diary o' a Contest Rocketeer:

3-24-08: Got me box o' parts . Ya scallywag! Blimey! Begad! Blimey! Will post pics later.

3-26-08: Here are me parts. Begad! Ya scallywag! Nay much for large nose cones, but looks like I can make somethin' up if need be.

Click to Expand
(Click t' Enlarge)

3-27-08: There was about three sheets o' paper inserted in t' box when I got it. Aye aye! Now I can't seem t' find those sheets.

3-31-08: I found those sheets o' paper I misplaced along with another tube coupler/tube and a mixin' cup... do I have t' retake t' picture o' all t' parts?

5-24-08: Just wanted t' mention that I started buildin' me contest entry . Avast, me proud beauty! Blimey! Well, blow me down! Blimey! Was kinda hopin' for longer 18mm tubing, but I'll make due with what I have. Ya scallywag! Blimey! If I can make it stable with t' length I have t' work with, ya bilge rat, this may be a two stage rocket.

5-27-08: Pretty much finished buildin' me entry. Blimey! Blimey! Goin' test fly it this weekend unpainted.

Question: Just went over t' rules again and it said good photos o' build process. Ahoy! Arrr! I hope illustrations qualify for that because thats what I was doin' ><.

I thought about takin' photos o' t' build.... Well, blow me down! but me cheap camera is broke, ya bilge rat, me bucko, and I did nay want t' get glue, paint, etc on me expensive gear.

5-29-08: Well, Construction o' me entry has been complete. Aye aye! I wanted t' get in some test flights at todays CMASS launch, shiver me timbers, but that has been postponed till Sunday, me bucko, and I can't make it after church... Ya scallywag! Avast, me proud beauty! so since t' next CMASS launch I will be able t' go t' is nay until after t' contest deadline, shiver me timbers, me bucko, I will have t' test it on me own.

I am goin' test it as a single stage configuration first. Probably with a B6-4. Begad! Aye aye! It has an unique fin configuration, ya bilge rat, so I like t' see how it behaves before I try it with t' booster.

5-31-08: Minor setback - While cleanin' up I "bumped" t' rocket and crimped t' main body tube and sent one o' t' details flyin' across t' room. Begad! T' Crimp was easily fixed by splicin' t' tube, me bucko, insertin' a tube, and gluin' them back together. Aye aye! T' detail was like findin' a needle in a haystack, arrr, but I found it after searchin' high and low.

6-01-08: Much t' windy today t' test fly me creation. Begad! Avast! Maybe tomorrow if I have time.

6-03-08: Got t' test flights done. Aye aye! I First I flew it single stage with a B6-4. Aye aye! Good flight, me bucko, did nay get very high. B6-2 would be a better choice. Avast, me proud beauty! Arrr! Second test flight be in its two stage mode. B6-0 and B6-4 was used. Avast! Aye aye! Perfect flight but I did nay get a picture since t' guy pushin' t' button failed t' do a proper countdown ><. Today I started writin' t' documentation. Ya scallywag! Will paint me rocket soon . Begad!

On Pad Launch Single Stage

On T' Pad - Nekkid

Test Launch - Single Stage

The Avenger
(Click t' Enlarge)

6-17-08: Had an issue where t' Krylon black reacted t' t' humidity and fogged up. I am paintin' rust oleum over it, shiver me timbers, ya bilge rat, I hope it does nay have a reaction . Begad! Blimey! My Drawings for me rocket are almost done, so that means I will have t' documentation done soon . Weather is forcasted t' be poor all this week, me hearties, so gettin' a in-flight picture before the deadline may be an issue.

BTW, requirin' an in flight photo shouldn't be a requirement. Arrr! Ahoy! For me, t' next launch where I can fly it on larger motors won't be till after t' contest is over, arrr, ya bilge rat, so that means I have t' fly it at t' local park, which limits me to B6-0 in t' booster, matey, matey, and I only got one left. And its hard t' take a picture and launch t' rocket at t' same time, and its hard t' get someone t' help . Well, blow me down! So If I miss t' shot, I don't have any more B6-0's, which limits me t' C6-0's which I will loose t' rocket, shiver me timbers, or A8-0's...

I got a shot o' t' unpainted test flights with it single stage on a B6-4. Would that count? I also flew it two stage, arrr, but t' helper did nay know how t' do a proper countdown and I did nay get a launch shot o' it in two stages... T' paintin' and detailin' will be done this week, me bucko, just at t' mercy o' weather t' get a finished launch in before the deadline (which for me be t' 27th, cause I am leavin' on vacation and won't be back till way after t' deadline).

6-20-08: My rocket is finished . Avast, me proud beauty! I think me paint scheme came out extremely well. Ya scallywag! Now I need t' finish the documentation...

Fully Illustrated Instructions


Designin' t' Avenger

Two stage rocket design which is me entry for t' "Box-of-parts" design contest. Aye aye! Begad!

T' parts for this rocket be limited t' whatever parts were present in t' Priority mail triangle that I got. Upon openin' t' box, I noticed thar was only a limited number o' large tubes, shiver me timbers, matey, and a large collection o' smaller tubing. Begad! Arrr! Also lackin' be amount o' quality o' good sheet balsa, shock cord material, matey, launch lugs larger than 1/8" or parachutes larger than 12." Pokin' around I noticed I had a Custom Eggloft cone, matey, which I decided right off the bat I wanted t' use. Blimey! I also noticed I had a 2" wide strip o' aileron balsa stock. Begad! I wanted t' use that to. Begad! Ahoy! There was also quite a collection o' BT20-50 centerin' rings which I decided would be used for detailing. Blimey! Ya scallywag!

Now t' challenge; design a rocket worthy o' placin' as high as possible in t' Box o' Parts contest usin' the materials I have at hand. Well, blow me down! Arrr! I had t' design a rocket that was light enough t' be safely launched from a 1/8" launch rod (although I could make larger LL with t' paper included) and recovered safely from a 12" parachute with a typical rubber shock cord. Blimey!

After drawin' several designs, me hearties, I finally came up with a basic plan that I liked. Blimey! Ya scallywag! I thought about layin' out the design in Rocksim, but decided against it because Rocksim does nay handle "Tail-Ring" designs well. Begad! I did end up usin' Rocksim t' help determine what span t' Pylons need t' be so I could create t' templates. Avast, me proud beauty! For t' most part, buildin' t' rocket was easy. However, me bucko, gluin' t' fins made from t' aileron stock was a bit tricky t' align properly, and gluin' t' tubes on t' tip was even more challengin' t' get aligned right. Aye aye!

To finish t' rocket, me bucko, shiver me timbers, I used Bondo Glazin' and Spot putty t' fill in t' joints betwixt t' aileron fins and the tubes. Then I applied several coats o' Rust Oleum Light Gray Automotive primer, me hearties, sandin' betwixt each coat. Once I was satisfied, t' rocket be sprayed with a base coat o' Gloss White. Begad! Then t' Fin Tip Tubes and t' center rin' o' the nosecone was painted Red. Begad! Avast, me proud beauty! T' top section o' t' nosecone was then painted Yellow and t' Base part was painted Black. Usin' a small paint brush, me hearties, t' Guns were painted Black, and t' missiles be then detailed with a Silver nose, me bucko, and the tail end Silver, me bucko, arrr, Red, me hearties, and Black. Avast, me proud beauty!

Lift Off Thrusting

Staging 2nd Stage Thrusting WayUp There

So far t' Avenger was flown three times. Avast, me proud beauty! First time I launched it with a B6-4 in t' single stage mode. The rocket did nay go as high as I thought it would, so t' 4 seconds be t' long but t' parachute did deploy in time. Avast! Aye aye! A B6-2 would be a better choice for a single stage B motor flight. Blimey! Avast! T' second flight be in two stage mode. Ahoy! A B6-0 in the booster, arrr, me bucko, and a B6-4 in t' sustainer. Begad! Great Flight and I was happy t' see that a 12" parachute was t' perfect chute size for this rocket since it gently drifted towards t' end o' t' field and landed betwixt two trees. Aye aye! Blimey!

T' most recent flight was a two stage flight with a B6-0 in t' booster and A8-3 in t' sustainer. Blimey! It be a perfect flight and recovery. Arrr! Well, blow me down! Blimey! One o' t' Guns peeled off a layer o' paper, but I do nay know if that be damage from recovery or handling.

Under Chute

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