shanejohnson2002
BT60 Enthusiast
- Joined
- Feb 6, 2019
- Messages
- 193
- Reaction score
- 155
Hello all!
I decided to attempt my L1 cert soon, but I also decided to stray off the beaten path with a scratch build. In this case, I'm upscaling an Estes Crossfire ISX. I already made a BT60 x 24mm upscale which turned out much better than expected, so making the choice to take it a step further was pretty easy. Plus, I like tinkering, designing, engineering myself into corners and then applying creative solutions to get myself out. So here we are.
Allow me to present the 3" x 38mm Crossfire ISXL.
The biggest reason I chose this one, other than the fact that I really like this model from Estes, is the rather inefficient nose cone shape and big, draggy fins and fin tabs should keep it fairly "low and slow" for a good L1 cert attempt. I know 3" is on the smaller side for an L1 build, but this design is as heavy and draggy as some 4"+ models.
With all of the latest changes, it finally looks like a good balance between weight, impulse, CG/CP, etc. There were a few compromises that had to be made, but we'll see how they translate into real life.
Everything you see in the sim has been carefully weighed on my reloading scale (or postal scale if it was too heavy), so the weight is as close to accurate as I can make it.
I decided to attempt my L1 cert soon, but I also decided to stray off the beaten path with a scratch build. In this case, I'm upscaling an Estes Crossfire ISX. I already made a BT60 x 24mm upscale which turned out much better than expected, so making the choice to take it a step further was pretty easy. Plus, I like tinkering, designing, engineering myself into corners and then applying creative solutions to get myself out. So here we are.
Allow me to present the 3" x 38mm Crossfire ISXL.
The biggest reason I chose this one, other than the fact that I really like this model from Estes, is the rather inefficient nose cone shape and big, draggy fins and fin tabs should keep it fairly "low and slow" for a good L1 cert attempt. I know 3" is on the smaller side for an L1 build, but this design is as heavy and draggy as some 4"+ models.
With all of the latest changes, it finally looks like a good balance between weight, impulse, CG/CP, etc. There were a few compromises that had to be made, but we'll see how they translate into real life.
Everything you see in the sim has been carefully weighed on my reloading scale (or postal scale if it was too heavy), so the weight is as close to accurate as I can make it.
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