Ring Fin / Rail Tail Cd in RocSim

The Rocketry Forum

Help Support The Rocketry Forum:

This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.

gdjsky01

Kim's Rocketeer
TRF Supporter
Joined
Jan 20, 2011
Messages
6,385
Reaction score
2,061
Rockets I add Ring Fins to seem to have the Cd go through the roof. Are external rings really that terrible? :confused::confused::confused: I have heard there is base drag concerns but only at supersonic speeds (which I am not planning on thanks)...

I've been overriding the Cd but then, that could be disastrous if RocSim is right.
Just adding a BT60 ring to a simple BT-50 model seams to put the Cd over 1

Is that your experience?

Thanks for your info/experiences
Jeff
 
Tube and ring fins are very high drag, as a general rule. I'm not sure if rocksim's model is accurate, but I do know that they have substantially more drag than a comparable standard rocket.
 
Yep, lots of drag from them.

I had a 7.5" rocket with a 16" ring fin, and RockSim was never close to accurate with it.

-Kevin
 
Back
Top