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|03-20-2014, 08:40 PM||#1|
Join Date: Jul 2008
Location: Cheshire, UK
Thanked 48 Times in 47 Posts
Club: A lone flyer!
Another Depron Delta but with 6 jets!
Can you tell what it is yet?
A North American XB70.
A truly impressive beast that could cruised for 2000 miles at close to Mach 3 with its first flight 40 years ago!
The reason I this considering this was as a 'backup' to my four EDF Depron Concorde just in case using 40mm EDFs proved to be just too difficult.
Built to more or less the same size and in a similar way it looked like a 70mm fan could be used.
But what would be the effect of using 6 individual nozzles?
The only way to find out would be to build a stand alone 'test' duct. If it did not work out then not too much would be lost.
The duct is basically a tapered box built in 3mm Depron.
Each nozzle is made up of four pieces of Depron carefully formed to shape.
The duct is the correct scale shape.
The front of the duct has to change from a rectangle to a 70mm circle.
The completed duct with the basic 70mm AEO EDF glued on.
The thrust was tested by the simple method of taping the 3000mAh battery and several strips of steel to the duct until it was just 'neutral' in my hands. A rather alarming process but it weighed 27oz.
This figure was as much as my estimate for the all up weight of the Depron XB70.
To be continued!
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