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Darryl Stevens' A+6
Darryl Stevens' A+6

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Darryl Stevens' A+6
Description: The A+6 is a fairly easy build for someone who has never tried building an indoor duration model. It was designed by Darryl Stevens way back in September of 1994, so as far as A-6 designs go, it is rather dated. Back then the A-6 was not an official AMA event, so Darryl’s A-6 design adhered to Clarence Mather’s original A-6 rules, which included tissue covering only. I recently updated the A+6 plan by adding the 2015 AMA rules for the A-6 event (AMA event 222). However, I forgot to mention that in the AMA event 222 rules, the propeller spar cross section does not need to comply with the 1/16” square minimum cross section rule. I am not sure whether this was intentional or an oversight by the AMA rules committee.

Darryl’s original A+6 model weighed in at 1.41 grams using Japanese tissue paper. His A+6 had a 5 minute 26 second flight in the Boeing Everett factory (80 foot ceiling) on a 14” loop of 0.030” wide Tan II rubber on September 25, 1994. Darryl’s original hand drawn plan for the A+6 did not show the angle of the flat propeller blades relative to the plane of rotation; instead, he indicated that the prop had a 20” pitch, which sounds impossible for a tiny 6” diameter propeller. When I first drew the CAD plan for Darryl’s A+6 in 2003, I decided to show the prop blades at 38 degrees relative to the plane of rotation, because at the time, many of the winning A-6 competitors were using this blade angle. Many competitive A-6 contestants today are using a 45 degree blade angle, which Clarence Mather used on his very first A-6 model.

The wing on the A+6 was designed to have 30 square inches of area before rotating the wingtips up to an incredible 1.5 inches for the tip dihedral. I built a Stevens’ A+6 in 2003 and I used only 0.5 inches of dihedral in each tip, yet it had plenty of roll stability and its projected wing area was 29.88 square inches, as compared to 27.88 square inches for the same wing with 1.5 inches of tip dihedral. My A+6 weighed a very heavy 1.9 grams, mainly because I used too much plus 6 pound per cubic foot balsa wood. Maybe that’s where the +6 came from in my A+6! The best time I ever obtained with my pudgy A+6 was 3 minutes and 40 seconds in the Boeing Everett factory. I used a 14” loop of 0.045” wide Tan II rubber, which is 50% wider and 50% heavier than Darryl’s A+6 motor!
Keywords: Indoor, Duration, Freeflight, A-6
Date: 05.25.2015 18:39
Hits: 3823
Downloads: 706
Rating: 0.00 (0 Vote(s))
File size: 382.9 KB
Added by: higgphanx1

Comment:
zeke
Member

Join Date: 05.16.2013
Comments: 18
A+6
I remember seeing this plane fly. I remember it so well because at the time (new to indoor flying) I was building and flying the A6 designed by D. Aronstien. When Darryl flew this it made me realize how far you could take design rules and push them into another efficient configuration. Thanks for the updated plan! This is great.
06.02.2015 23:00 Offline zeke
modelaircrafter
Member

Join Date: 03.14.2019
Comments: 1
covering
Wouldn't condenser paper be lighter?
03.15.2019 00:32 Offline modelaircrafter



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