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Square Lexon fins

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cobra1336

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Building a bic pen rocket. 3 ft. long, 2 inch diameter. Working on the nose cone now and cutting some Lexon fins. Was trying to decide on fin shape and I wondered, why not keep them square. 38 mt and have an 29 mm adapter. Will do some G motors at first depending on weight then up to maybe an H or I. Guessing at weight right now I would say I'll bee in the 2-3 lb. zone. My beer bottle rocket (3 lbs.) flys great on H motors but is a lead sled thru the air. So, would the sleeker pen rocket be O.K. with square fins? Fins are 4" tall X 4.5" long right now.
 

cobra1336

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opps............yes lexan.............so, would square fins be O.K.?
 

dragon_rider10

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I hope that wouldn't be a glass beer bottle for that other rocket.

You would probably do better with tapered fins on the pen, if I had to guess.
 

ScrapDaddy

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Building a bic pen rocket. 3 ft. long, 2 inch diameter. Working on the nose cone now and cutting some Lexon fins. Was trying to decide on fin shape and I wondered, why not keep them square. 38 mt and have an 29 mm adapter. Will do some G motors at first depending on weight then up to maybe an H or I. Guessing at weight right now I would say I'll bee in the 2-3 lb. zone. My beer bottle rocket (3 lbs.) flys great on H motors but is a lead sled thru the air. So, would the sleeker pen rocket be O.K. with square fins? Fins are 4" tall X 4.5" long right now.
Where are you getting a 3 foot long pen? :confused:
 

Micromeister

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Cobra:
square Polycarbonate fins will be fine as long as the area is sufficent.

017-sm_R2-D2 Odd-Roc_02-12-86.jpg


242a-sm_MM Snowman 7mm_12-15-00.jpg
 

cobra1336

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Where are you getting a 3 foot long pen?

It's a scratch build. Found some 2" white tubing (not PCV) Had to scratch a nose cone from balsa and body filler (not done yet). Will look like a pen cap when done.

I did taper the fins a little last night. It is generally the same size as my Callitiso so I sort of copied the fin size but they have more surface area.
 

Micromeister

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Sure like to see some pics Cobra when ya get a chance.
I'm kinda partical to Skywriting Odd-Rocs LOL!!!
 

cobra1336

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got the nose cone done. here's some pics the cap is patriot blue the pics look black

pen 001.jpg


pen 002.JPG


pen 003.jpg


pen 004.jpg
 

cobra1336

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The first couple of pics makes the pen cap look short, sorry about the photos, it is to scale and looks bigger / longer in real life
 
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