yes, another min diameter rocket...but not built yet

Onebadhawk
madcow rocketry
Advertise with us
The Rocketry Forum

Help Support The Rocketry Forum:

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

Julian

Well-Known Member
Joined
May 8, 2013
Messages
54
Reaction score
0
I love all kinds of rockets. Bu lately i have been thinking of high altitude and mach numbers.

Goal: go as fast and high as I can using a CTI 6 grain first stage and a CTI 6 grain XL as the upper stage and a sport RRC3. (restricted by my budget and also by the fact that I want to use some of what I have)


Question: If I buy the wildman blackhawk 38 and use only one of its two tubes for the upper stage, and the second as a lower stage, given the fact that it could reach mach 2.5:grin:, will just using the JB-weld that comes with it be sufficient to hold the fins on?
also, will its advertised 500 degree F withstand aerodynamic heating at that speed?

Would it be better to scratch build it from aluminum, even though performance would be lost due to added weight?

Thanks Julian
 
Julian said:
I love all kinds of rockets. Bu lately i have been thinking of high altitude and mach numbers.

Goal: go as fast and high as I can using a CTI 6 grain first stage and a CTI 6 grain XL as the upper stage and a sport RRC3. (restricted by my budget and also by the fact that I want to use some of what I have)


Question: If I buy the wildman blackhawk 38 and use only one of its two tubes for the upper stage, and the second as a lower stage, given the fact that it could reach mach 2.5:grin:, will just using the JB-weld that comes with it be sufficient to hold the fins on?
also, will its advertised 500 degree F withstand aerodynamic heating at that speed?

Would it be better to scratch build it from aluminum, even though performance would be lost due to added weight?

Thanks Julian
Click to expand...

One more thing is this rocket stable at Mach 2.5 this should be 1.25 cal through out the flight is it??????
 
Julian said:
I love all kinds of rockets. Bu lately i have been thinking of high altitude and mach numbers.

Goal: go as fast and high as I can using a CTI 6 grain first stage and a CTI 6 grain XL as the upper stage and a sport RRC3. (restricted by my budget and also by the fact that I want to use some of what I have)


Question: If I buy the wildman blackhawk 38 and use only one of its two tubes for the upper stage, and the second as a lower stage, given the fact that it could reach mach 2.5:grin:, will just using the JB-weld that comes with it be sufficient to hold the fins on?
also, will its advertised 500 degree F withstand aerodynamic heating at that speed?

Would it be better to scratch build it from aluminum, even though performance would be lost due to added weight?

Thanks Julian
Click to expand...

The stuff that comes with Blackhawks is Proline 4500 and not JB weld. The TG on the Proline is unknown (but believed to be in the 250-500 range) and the TG of JB weld is 500F. Personally, I'd say both are okay but I prefer JB weld because I know what the TG is.
If I were you, I'd completely redesign the Blackhawk so that it's as short as possible. Blackhawks already have a ton of "dead space" that can be cut out. You might also want to redesign the fins to be more efficient. As to wether you need further reinforcement, it's too tough to make a call this early. Fin shape is just as important as reinforcement. Good luck with the build.

Alex
 
littlemisterbig said:
I would recommend proline 4500 for the tacking the fins and the fillets.
Click to expand...

This works if you have time and a jig to hold them in place.

4500 used to "tack" on fins is not tacking them on in my opinion. It is slower curing epoxy.

It is very useful for fillets.
 

Similar threads

The_Quacken
complex L record attempt?
Replies
21
Views
2K
The_Quacken
The_Quacken
Zertyme
Gas Gas Gas, a single-use 5G EMK rocket
Replies
13
Views
1K
Zertyme
Zertyme
T34zac
Yet another 38mm min diameter rocket
2
Replies
39
Views
5K
SDramstad
SDramstad
robopup
(Yet Another) 100k Attempt
5 6 7
Replies
191
Views
22K
robopup
robopup
LandonC
98mm Min-Diameter Composite Mach 3 Build
2 3 4
Replies
101
Views
12K
pugachu
pugachu

Latest posts

Back
Top