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Old 03-20-2014, 08:40 PM   #1
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Default Another Depron Delta but with 6 jets!

6 exhausts yes but only one fan.
Can you tell what it is yet?
A North American XB70.
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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.
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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.
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Each nozzle is made up of four pieces of Depron carefully formed to shape.
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The duct is the correct scale shape.
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The front of the duct has to change from a rectangle to a 70mm circle.
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The completed duct with the basic 70mm AEO EDF glued on.
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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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