Calvin&Hobbes 2 Stage High power Rocket for URRF

I cut out a practice centering ring today and it fit perfectly without much sanding. the only thing I ran into was that the drill bit for the hole saw did not fit into my drill so I had to do old school and used my hands and near the end a socket wrench to turn the cutter. hopefully I can get a bunch of stuff done this weekend.

My eggfinder says it will be here today so I hope to get that put together and have it working this weekend I hope I can get to lowes for a band saw blade for cutting out the fins and will continue to cut out the centering rings.


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Got my Eggfinder today and put it together in no time!!
I have an antenna that will be here for it on Tuesday.

Also was able to get the centering rings cut out. I cut out 3 1/8" rings and one 1/4" ring for the aft of the booster. I drilled to quarter inch holes for the madcow retainer. Going to get a band saw blade tomorrow to cut out the fins and hope to get things glued in soon



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Got all the centering rings sanded down to size.



Then I tacked them in place about 1/4" way down the motor tube with some super glue.



For the fillets I mixed up 3 grams of epoxy and a lot of filler and applied a generous fillets on the top and bottom of the forward ring.


On to the shock cord. I picked up some high quality 1/8" kevlar cord( not the cheap stuff I posted in another thread). It came in 30ft so I cut 3 10ft segments.




More to come soon.


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While waiting for the fillets to dry I cut out a 1/4" bulkhead for the shock cord attachment I'm the nose cone.


Forge shock cord attachment on the booster and sustainer I drilled a 1/8" hole in each forward centering ring and tied a slip knot on the other side. I smothered it with super glue to hold it in place.



In order I ensure that the inter-stage coupler stays attached to the booster after the separation charge I drilled and tapped three shear pin holes.



Hoping to get a lot of stuff fine today in order to be ready for the launch. Lots more to come.


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For the shear pin holes, I recommend that you soak them with CA. Wipe the excess CA away, then redrill and tap the holes. This will make the holes a lot more robust.

I also do this with the openings of paper tubes to prevent delamination.

I actually did everything you said just didn't mention it it is really good advice. I do this with all my builds now.


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Epoxied in the motor mounts minus the aft rings so I can do internal fillets.




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Drilled holes for the rail buttons.



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Finally got my dad to take me to lowes to get the band saw blade!!! I cut out the fins and then used my belt sander to bevel theme they came out very well and they all fit








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Fins epoxied in using Jab Wood weld.




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Got the sustainers fins epoxied in and started on both of the internal fillets. Hoping to do some of the external fillets later today

Now that the internal fillets are done I was able to get the first set of external fillets done.



My tape stuck to much



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Here it is right now. Still have to order one more body tube and coupler that will go on top of the sustainer.




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Applied some Elmer's wood filler to the spirals.



Also filled in some gaps at the front of the sustainers fins from the airfoil with some fix it epoxy clay.



The large filled in spot is from where I accidentally dropped my drill on it....whoops!!!!


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Your build is coming along great, I can't wait to see the flight report. I always loved 2-stage rockets and I should build one soon, maybe a 54mm. Keep up the good work and keep us posted!

Thanks.

Well made another stupid mistake!!!!! Forgot to drill the hole in the aft sustainer centering ring so I can attach a length of 1/4" brass tube for the igniter to pass through. So I has my sister with small hands hand drill the 1/4" hole. Cost me 3$ and I had to make her lunch!!! Next time I will definitely remember to take my time


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Fillets on the booster are done.





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I started on the sustainer external fillets and will finish them next weekend


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Here is what mark came up with for the decals




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Got my 1/4" brass tubing to thread the igniter through for the ignition of sustainer motor.

Then glued it in leaving about 1/2" out the aft end.


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Now thinking about the separation charge should I be worried about the hot gasses causing the sustainer motor to light? Or if I put a lot of dog barf in.


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conman13 said:

Now thinking about the separation charge should I be worried about the hot gasses causing the sustainer motor to light? Or if I put a lot of dog barf in.


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Click to expand...

No.

Ok


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conman13 said:

Now thinking about the separation charge should I be worried about the hot gasses causing the sustainer motor to light? Or if I put a lot of dog barf in.


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Click to expand...

I think that's pretty unlikely. I do typically cover the motor opening though, mostly to protect the igniter wire leads.

Jim

JimJarvis50 said:

I think that's pretty unlikely. I do typically cover the motor opening though, mostly to protect the igniter wire leads.

Jim

Click to expand...

good to know will do.

Started cutting out the bulkheads for the AV-Bays this morning. Placed an order for the 8-32'' all-thread and nuts. traced out the sleds on 1/8'' plywood. Hopefully I will be able to finish the fillets on the sustainer, sand the spirals and start the AV-Bays this weekend. Vinyl is on it's way!!!

Cut out the electronics sleds out of 1/8" ply. Used 1/4 launch lugs to be attached to the all thread. The one with 4 lugs is the sustainer sled and the one with two lugs is the booster sled.



Finishes the second set of fillets on the sustainer today. Will finish the last set tomorrow.


Cut out bulkheads for the electronics bays. I will use the 1/4" on for the booster forward bulkhead which will be epoxied in place and then a 1/4" with a 1/8" to center it on the coupler. Hoping to get the rest cut out Monday.






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Filled in the pilot hole with some fix it epoxy clay then epoxied down the charge cap with some rocketpoxy. I used an 1/2" copper end cap for the separation charge well.




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