Wildman V2 Sport Build

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rfjustin

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A few weeks before Midwest Power 12, I stopped off to see Tim at Wildman Rocketry. I picked up a CTI K-1440 WT for MWP 12 and some other rocketry goodies as well. The last item on my wish list was the new V2 Sport, but had no idea if he had the item in stock. Tim was able to kit a V2 sport together for me while I waited. The only lightweight 54mm airframe tube he had in stock at the time was plain green fiber glass instead of black. The color of the main tube does not matter to me either way as I plan to paint the V2 once the weather breaks in the spring. I don’t think my wife would be a fan of me spray painting in the house over the winter.

The size of the V2 Sport borderlines “cute” but I had to have it. I wanted to document this very brief build.

Build day 1:
- prepped motor mount for bonding
- using pliers, bent motor clip to shape
- moto-tool off snap ring “ears” to equal length
- bonded motor retainer to motor tube (motor casing, rear closure, and snap ring in place)
- round file, notch top centering ring
- bevel fins, prep for bonding
- slightly enlarge fin slots in tail cone
- scuffed inside of main body tube
- scuff outside of tail cone

Build day 2:
- cut to length and bond motor mount shock cord (leaving clean area for top centering ring)
- cut to length and bond nose cone shock cord

Build day 3:
- drop motor mount in leaving top centering ring in place temporarily for alignment
- tacked 4 fins in place with 5 minute epoxy
- removed top centering ring and foamed tail cone (30ml total, PML foam)
- removed excess foam
- bond top centering ring in place and at same time, bond tail cone assembly to main airframe

Build day 4:
- drill and tap (2) 8-32 rail guide screw holes
- scuff and apply fin fillets, 30 minute epoxy used here (1 of 4)

Build day 5:
- fin fillets, 30 minute epoxy used here (2 of 4)

Next step is to add the other two fillet sets, and add recovery cord and a small parachute. I’ll add final weight of the rocket once fully finished and ready to fly… next year… :sad:



Justin

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Man, did you have to show us this? That is a must have. My wife is sure to leave me. :)
 
Justin, i want one too.

I am glad you remembered how to build one:)


Mark Koelsch
Sent from my iPhone using Rocketry Forum
 
Glad to see another build. Nice little kit. How ya gunna stuff the K1440 in thar?
 
One a side thought... if anyone buys this kit and decides they cant live without having the fins beveled, send them my way and I will bevel them for you... ;)



Justin
 
Following up with that side thought, anyone who has not had the opportunity to see Justin's bevel work, it is top notch. I wish I knew this offer was on the table before I glued mine up.
 
Justin, what are you using to bevel fins. The fins that you cleaned up for me for my Extreme were very well
done.


Mark Koelsch
Sent from my iPhone using Rocketry Forum
 
So the bit is vertical. What are you using to guide the fin across the bit?


Mark Koelsch
Sent from my iPhone using Rocketry Forum
 
I picked up one of these at MWP... I'll take you up on that bevel offer. PM me with details
 
Can you get a good bevel on 1/16" or is it too thin?


Mark Koelsch
Sent from my iPhone using Rocketry Forum
 
So the bit is vertical. What are you using to guide the fin across the bit?


Mark Koelsch
Sent from my iPhone using Rocketry Forum

Mark,

These pics better show the router set up and the 2" wide aluminum angle iron used to pass the fin across the bit...



Justin

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I see- I was likely complicating things a bit more in my head than the reality. What is the angle on the bit again? Do you do the bevel in one pass?


Mark Koelsch
Sent from my iPhone using Rocketry Forum
 
I see- I was likely complicating things a bit more in my head than the reality. What is the angle on the bit again? Do you do the bevel in one pass?


Mark Koelsch
Sent from my iPhone using Rocketry Forum

Mark,

The bit is 15 degree. For both thin and thick G10 fins, I take multiple passes taking off a little bit of material at a time. Each time I raise the router slightly in order to achieve that sweet spot where you leave a nice bevel as well as some meat between.
 
Build day 6:
- fin fillets, 30 minute epoxy used here (3 of 4)

Build day 7:
- fin fillets, 30 minute epoxy used here (4 of 4)
- added tubular Kevlar recovery cord and quick link

Final weight (not including parachute) .94 lbs




Justin

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Got my newly beveled fins tacked in place... Realized that I forgot to epoxy the shock cord harness in place first.
 
Bummer. You'll just have to leave it on the desk as a display model and build another... :wink: :wink:

Adrian

Lol... Yeah right! Luckily I caught it before I foamed the fin can... So with a little tricky stick work, I'll get it on before foaming.
 
Mark,

There's not a lot of "meat" to bevel with 1/16" thick fins, but you can still bevel enough to make it worthwhile.



Justin

View attachment 246789

Are you beveling both sides of the fin or just one? It has never occurred to me to just bevel one side, I want them symmetrical, but I know 1/16 is pretty thin to do both sides.
 
My attempt at an Open Rocket file... Not balanced for CG yet since I'm not done building, but there it is...
Definitely not getting good readings on flight sims. Altitude seems to be fine, but weird readings on recovery. Probably since the fins aren't "on" the body tube. If anyone has ideas, let me know!
View attachment V2 sport.ork

Justin, thanks for beveling the fins! I learned a ton and they look great.
 
My attempt at an Open Rocket file... Not balanced for CG yet since I'm not done building, but there it is...
Definitely not getting good readings on flight sims. Altitude seems to be fine, but weird readings on recovery. Probably since the fins aren't "on" the body tube. If anyone has ideas, let me know!
.

Open rocket & Rocksim don't do sims too well with V2 rockets. I think it's because of the low CG & the boat tail transition.

Question - What is weight of your rocket with no motor? Also what was your CG? I always use the over-ride feature in OR.
 
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