I am not sure what the Rule Of Thumb is for fins and wanted to ask before making a final decision on fins here is what I got so far ((Attached in the post)) The Rockets Diameter is 4 Inches and The height of the body tubes is 68 Inches. The Fins on the Link ATTACHED I have not really made they are made up fins in openrocket but wanted to ask you guys what you think The measurements should be and what should I use.
What Fins Should I Be Using for my rocket?
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Sooner Boomer
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What motor are you flying it with? Stability shows to be about 1.5*. A little low for my tastes. A lot of how well the fins will work hast do with speed off of the rod, the first four feet or so of flight. Larger fins will give more aerodynamic stability than small fins.
* This is the static stability. In theory, you could biuld a finless rocket, depending on the center of gravity and the center of pressure to stabilize the rocket.
Do you have a copy of the Estes Design/Tech notes? One of them has a good explanation of fin design and stability.
* This is the static stability. In theory, you could biuld a finless rocket, depending on the center of gravity and the center of pressure to stabilize the rocket.
Do you have a copy of the Estes Design/Tech notes? One of them has a good explanation of fin design and stability.
dr wogz
Fly caster
The general rule of thumb I've used is:
fin dims:
2* diameter for root length
1* diameter for fin height
1* diameter for tip length
if you are close to this, you should be good.. The Patriot is about the best example I can give for this rule..
fin dims:
2* diameter for root length
1* diameter for fin height
1* diameter for tip length
if you are close to this, you should be good.. The Patriot is about the best example I can give for this rule..
I will be using a G-80 thunder
I am building this rocket scratch So No notes But I want it to be able to fly doesnt mean I will launch it but I want it to be stable and airworthy might give it to someone I more enjoy Building Them.
Sooner Boomer
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I would move as much stuff as far foward as I could. You show almost everything in the middle of the rocket.
Also, check this out, and see if it answers any questions...
https://estesrockets.com/wp-content/uploads/Educator/2845_Classic_Collection_TR-TN.pdf
CoyoteNumber2
Original San Diego High Power Rocketry
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Your name is Brian but your avatar is Peter?
dr wogz
Fly caster
same voice.. er, same person doing the voice..
grouch
Well-Known Member
That thing looks huge for a G80. Why not scale it down so it can actually fly?
Yeah, My son made my account for me.
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