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 . Well, blow me down! Will post pics later.

3-26-08: Here are me parts. Begad! 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. 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 . Ya scallywag! Was kinda hopin' for longer 18mm tubing, but I'll make due with what I have. Avast, me proud beauty! Begad! If I can make it stable with t' length I have t' work with, me bucko, this may be a two stage rocket.

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

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

I thought about takin' photos o' t' build.... Avast, me proud beauty! but me cheap camera is broke, me hearties, 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. Well, blow me down! Avast, me proud beauty! I wanted t' get in some test flights at todays CMASS launch, me hearties, shiver me timbers, but that has been postponed till Sunday, me hearties, and I can't make it after church... Begad! Aye aye! so since t' next CMASS launch I will be able t' go t' is nay until after t' contest deadline, me hearties, me hearties, I will have t' test it on me own. Arrr!

I am goin' test it as a single stage configuration first. Begad! Arrr! Blimey! Probably with a B6-4. It has an unique fin configuration, me hearties, 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. Avast! Aye aye! T' Crimp be easily fixed by splicin' t' tube, insertin' a tube, and gluin' them back together. T' detail was like findin' a needle in a haystack, shiver me timbers, but I found it after searchin' high and low.

6-01-08: Much t' windy today t' test fly me creation. Ya scallywag! Avast, me bucko, me proud beauty! Maybe tomorrow if I have time.

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

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. Begad! I am paintin' rust oleum over it, I hope it does nay have a reaction . My Drawings for me rocket are almost done, me hearties, so that means I will have t' documentation done soon . Ahoy! Weather is forcasted t' be poor all this week, so gettin' a in-flight picture before the deadline may be an issue.

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

I got a shot o' t' unpainted test flights with it single stage on a B6-4. Avast! Blimey! Avast, ya bilge rat, me proud beauty! Blimey! Would that count? I also flew it two stage, 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, 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 . 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. Well, blow me down!

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

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. 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. Aye aye!

After drawin' several designs, matey, I finally came up with a basic plan that I liked. Ya scallywag! I thought about layin' out the design in Rocksim, matey, 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! Avast, me proud beauty! For t' most part, buildin' t' rocket be easy. However, me hearties, 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. Well, blow me down! Arrr!

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

Lift Off Thrusting

Staging 2nd Stage Thrusting WayUp There

So far t' Avenger was flown three times. Begad! 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 was t' long but t' parachute did deploy in time. A B6-2 would be a better choice for a single stage B motor flight. Well, blow me down! T' second flight be in two stage mode. Begad! A B6-0 in the booster, and a B6-4 in t' sustainer. Blimey! Aye aye! 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. Blimey! Ahoy!

T' most recent flight was a two stage flight with a B6-0 in t' booster and A8-3 in t' sustainer. Avast, me proud beauty! It was a perfect flight and recovery. Avast! One o' t' Guns peeled off a layer o' paper, shiver me timbers, ya bilge rat, but I do nay know if that be damage from recovery or handling.

Under Chute

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