Little Bit (oz5763)
About this Plan
Little Bit. Tailless sport model for .10 power.
Quote: "Dereck Woodward offers 28 inches of tailless excitement for .10 size engines.
It was embarrassing! Being at the Old Warden ASP Designs Day with people asking me what I had for Small Models Day - when the 25 powered 'Bubble' tailless was about the smallest model I owned! So, an OS Max 10 of indeterminate age, but sound of bearing and piston was unearthed. The Loft of Remembrance yielded some mini servos and a Rx. Needed - one small nicad - no sweat, make one.
It has been truly said that the most useful tool in Small Modelling, next to a very sharp balsa knife, is the copier with programmable reducing functions. This 'tool' quickly gave a workable drawing for the primary structure of the wing. Helpings of imagination and simplicity combined to produce a 28in span sort of 'Tailless Ugly Stik'.
Test flying turned out routine - forget it looks as though it shouldn't be flying - and enjoy that it is. Well, 'little Bit' doesn't fly like every other model. Being 'nippy' responsive and vice free means she's more fun than many!
Board meeting: For once. I made a kit of parts! For the ribs I used the first as a pattern, cut the lot out and trimmed two 1/8 ones and two 1/16 to make the centre ribs. 1/4 x 1/8 hard balsa spars are fine and the trailing edge is 3/8 square with internal doublers to take the hinges, the leading edge is from 1/4 in sheet.
A workable assembly sequence is gluing the lower spar to the leading edge sheeting, then attaching the ribs onto that lot. Pin down onto the board with a 3/16 strip under the ribs as support. Now fit top spar, leading edge and trailing edge and top leading edge sheeting.
Noticed the gap between the centre-section ribs on the underside aft of the mainspar? This gives the aileron servo the room it needs to operate. Top and bottom LE sheet runs unbroken from tip to tip for strength.
For the ailerons, firstly decide on servo driver and placement. My low-tech solution is on the drawing, with the roll servo slides driven by the pitch servo aft of the wing. Mechanical mixing has an additive effect on control throws - long torque rods reduce throws, or be prepared to use rate switches. A mechanical linkage with two micros in a sliding tray with two more in the fuselage will just tit for a four channel version. This would give a fuller aerobatic performance up to spins and snap rolls.
If you've got the facilities, electronic mixing is the way to go and, allied to micro servos would give 'Little Bit' full four channel aerobatic capability. But don't let lack of it keep you out of the fun - that sophistication is the icing on the cake.
The elevons are light, stiff 1/4 in sheet with a carve and sand exercise..."
Quote: "Hi Steve, Attached are scanned plan and article for Dereck Woodward’s ‘Little Bit’ simple tailless model as presented with the now defunct ‘Radio Modeller’ back in ‘91. The plan’s a bit low-res (the original had gone surprisingly brown and brittle, so I pinned it to the wall and shot it with the digital camera rather than bending and scanning) but I’ve cleaned it up as much as I can and it should be good enough to build from. This model’s sooo simple it always fascinated me (I believe Dereck did it in several sizes and If I come a cross them I’ll send them in too) so I hope it’ll be an interesting addition to your collection! Regards,"
Direct submission to Outerzone.
Update 26/05/2019: Replaced this plan with a clearer copy, thanks to PetrFlidr, rchopper56.
Scan from PetrFlidr, cleanup by rchopper56.
Direct submission to Outerzone.
Supplementary file notes
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User commentsAll Dereck's models were simple to build and very much FUN models to fly. He was a good natured guy and entertaining to talk to. You really can't go wrong building this or any of the other sizes he did.
Terrytharme - 30/12/2014
Hi Mary/Steve! I've attached a picture of the Little Bit I built from plans I downloaded from you last year [more pics 003]. I flew it today for the first time. It was a glorious 30 seconds! I have some further adjustments to make on it I think. The OS 10 is pretty heavy for this plane. It required 4oz of lead in the tail just to balance. End result was a rather piggish plane in the air. Still. Looks good sitting there :)
AndrewG - 01/05/2017
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