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Posted by Gadgetman | Mar 15, 2008 @ 09:32 PM | 4,655 Views
HYPERION SUPER CHIPMUNK 70e ARF (Feb 2008)

This was my first attempt at a large electric model and I thought I’d pass on what I’ve learnt for the benefit of others. I found that by using ‘genuine Chinese’ components; it didn’t cost anywhere near what I expected. I hope this information will help you to ‘electrifly’ larger models. The Chippie has a wingspan of 1628mm (64”), the wing area is 691 square inches, the bare airframe weighs 1.5kg and the weight ready to fly is 2.9kg.

The Chippie has plenty of power and leaps in to the air in no time and goes vertical. Because of the low wing loading and wing design, it’s a very docile aircraft and I spend a lot of time just floating about with the power off. Stalls are mushy, with no tendency to tip stall. Landings with no wind take the length of the field as it’s floaty and a tail dragger. Any attempt to land before the speed bleeds off and it bounces back in to the air and tries to fly again.

The airframe is available from Hyperion dealers. I strengthened the fuselage opening with 3 X 1 carbon fibre. I made up a plywood box, which I dowelled to the firewall and mounted the motor to it with the supplied hardware. Baffles in each side of the cowl and holes in the side of the box send cooling air over the battery. I cut out a section of covering film on the underside of the fuselage to allow the air to exit. The motor is cooled by the centre hole at the front of the cowl and the air then passes over the speed control...Continue Reading