Square Lexon fins

[cobra1336]

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.

 

[rokitflite]

Would that be "Lexan"?

 

[cobra1336]

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

 

[dragon_rider10]

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]

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?

 

[Micromeister]

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

 

[cobra1336]

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]

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

 

[cobra1336]

I'm off tomorrow. I'll give it a shot.

 

[cobra1336]

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

 

[cobra1336]

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

 

[cobra1336]

Last pic is about right

 

[cobra1336]

Not done yet, but here you go