Ro-dart (oz3092)

 

Ro-dart (oz3092) by Dennis Neale from Aeromodeller 1951 - plan thumbnail

About this Plan

Ro-dart. Power driven autogyro.

Quote: "Casual conversation in a model shop in 1948 influenced Dennis Neale into trying his hand at a powered autogiro. His first attempts were not exactly exciting, and so he reverted to the more conventional type of model, but the thrill of rotary wing flight came back to Dennis with the introduction of the .5 cc Allbon Dart. With the extra knowledge gained in the two year gap, he was able to approach again the autogiro idea with more understanding and after reasoning out general principles of design he met with immediate success in the first prototype.

Ro-Dart is developed from that prototype which demonstrated itself so successfully at the Eaton Bray 1951 Summer Camp. The secret of Ro-Dart's success lies in the arrangement of the rotor, relative to the thrust-line. The advancing blade is at 0 degrees incidence, and retires backwards, as it were, at 10 degrees. Correct tail proportions, weight distribution and rotor blade areas also contribute greatly to its success.

Full building instructions are issued with each full-size APS plan; but to aid other rotary wing fans and stimulate your interest, we give flying gen here.

Flying. Check to see that the CG is between the two given lines. If it is in front of the forward line, ballast the tailplane, if behind the rear line, leave it until test flying. Use an 8 x 4, 7 x 4, or 8 x 5 (plastic) prop for the initial flights. With the motor running fairly fast, launch into wind with the rotor revving enough to lift the model from your hand. If the model turns gently with very little bank, increase the motor speed. The model should now climb.

The model turns to the right or left equally well, but needs different trim for right and left. If the model gains no height, check to see that there is no downthrust and if there is, remove it. If there is no downthrust, pack up the rear of the tailplane until the model climbs. If the model flies very fast and does not gain height, and has no downthrust, either sweep back the rotor axle more, or pack up the rear of the tailplane..."

Quote: "Ro-dart. Now the name says a lot here, this is a free flight autogyro designed by Dennis Neale. Now what can one say about autogyros - they are a hoot, trust me. If you want a laugh on the field then the autogyro is the way to go. I have built and flown autogyros for FF, CL and RC and they have had people falling about with laughter. I have never built this particular model but maybe I should give it a go and give my flying colleagues some fun. As always with my plans please take care if you are going to use them."

This is a modern redrawn plan in PDFvector format.

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Ro-dart (oz3092) by Dennis Neale from Aeromodeller 1951 - model pic

Datafile:

Ro-dart (oz3092) by Dennis Neale from Aeromodeller 1951 - pic 001.jpg
001.jpg

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User comments

The red, white and blue model [more pics 001] is my Ro-dart appropriately powered by a DC Dart dating from some 30 years ago. A nice simple build but a far from simple trimming exercise. After several weeks of trying (and repairing!) I finally did manage to get some decent flights out of it before finally wrecking it when it "landed" through a barbed wire fence!
Sundancer - 28/03/2016
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