Force 10 (oz12264)

 

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User comments

Printed out plans (had to split the pdf) and when printed the plans are reduced. Fan diameter is almost 3.5 inches.. Printing at 142 thru 142.8% percent of original yields 4.9” to 5.0” fan size…
Matt - 13/07/2021
Matt, the plan is indeed too small. The wing span is just 38 7/8 inches. An enlargement of 142.8% will bring the wing span to its stated 55 1/2 inches, but the duct diameter will still be too small. I'd suggest starting with the actual size of the fan and motor unit you intend to use and then scaling from there. If you supply your target dimensions, I'd be able to submit a correctly scaled plan that you can print and build from.
Jan Novick - 14/07/2021
Jan would you be able to scale this to fit a 40mm edf for me please?
Jason Miller - 23/07/2021
Jason, without a dimensional drawing of the fan unit you intend to use, I can't scale the plan accurately. However, your intent to use a 40mm fan raises some more relevant concerns. The original design specification is for a wing span of 55.5 inches with a 5 inch diameter fan. A diameter of 40mm is only 1.57", or 31% of the 5 inches specified. More importantly, since the swept area decreases as a factor of pi and the square of the radius, the discrepancy in area becomes even greater. The area of the 5" fan is 19.6 sq.in. while the area of the 1.57" fan is only 1.95 sq.in., a resultant decrease to about 9% of the original swept area. If we decide to scale the plans proportionately solely on the basis of dimensional characteristics, some rough calculations result in a model with a 17.5" wingspan, a forward fuselage section of about 1" wide and about 2.5" diameter width at the intake duct. With these dimensions you may be hard pressed to find space space for your receiver, batteries and servos.
Jan Novick - 26/07/2021
Jan i already have micro receivers and servos for small planes of those dimensions. Here are the specs for my edf
Dr Mad Thrust 40mm edf
Specs:
Rotor size: 40mm, 8 Blades
Weight: 63g
MAX RPM: 96000
MAX Power (10sec.): 330 Watts
Continuous Power: 290 Watts
Motor size: B2225
Kv: 8000
Voltage: 11.1V
Current: 26A
Thrust Power Upto: 400g
Inner Dia: 41mm
Outer Dia: 43mm
Motor Connectors: 2mm Bullet

Jason Miller - 26/07/2021
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