View Single Post
  #7  
Old 04-12-2018, 04:41 PM
BARGeezer BARGeezer is offline
Avid Builder
 
Join Date: Nov 2017
Posts: 610
Default

Blackshire,
If you are looking to clone the Sandpiper (Jayhawk) then it might be easier using the Estes plans rather than the Vashon ones:

http://www.oldrocketplans.com/estes/est1389/est1389.htm

You can purchase the 3d equivalent of the PNC-50S nose cone here:

https://www.shapeways.com/product/F...tionId=42814278

Or you can save some money and go old school by gluing the canards on a balsa cone.
The BT-50 tube is 7.75" long and the BT-20 engine tube is 3.5" long (from John Brohm's reference list). You will need to draw up a custom shroud simulating the tail cone. There is a shroud generating program available here (paper cones transitions program):

http://www.rocketshoppe.com/tips.htm

"Sandpiper" was an Air Force project to develop a hybrid motor for the Jayhawk replacing the liquid hypergolic propellants with a solid fuel propellant and storable liquid oxidizer. Potentially much less problems compared to toxic, volatile hypergolics. Interesting stuff.

Anyway, I have this on my build pile as well.
Reply With Quote