SFM News Letter

March 2009

by: David P. Andersen

The next meeting of the Scale Flyers of Minnesota will be in October 2009 after the summer flying season. Our meeting location is the American Legion Post, 6501 Portland, Richfield. East entrance, downstairs. Guests are always welcome. Come early and dine in the non-smoking restaurant.  (Directions)

At the last meeting ...

(Click on any photo to enlarge)

Roy Maynard showed an A123 lithium nano-phosphate battery and its FROMECO charger. This state-of-the-art battery is light weight, small size, fire-proof and has a life of 1000 cycles.  Very little internal resistance precludes testing with an ESVM, so an onboard device integrates current over time and displays remaining charge on an LED display. Can be charged in 15 minutes. Roy is using this battery for the ignition unit in a DA 50 engine.

Scott Russell gave away twenty 3/16” long-handled ball drivers, surplus from his work.  Thanks, Santa Scotty.

Bruce Rumery showed his World Models P-51 Mustang.  3.6 lbs.  Powered by Rimfire 41000 electric motor and lithium batteries.  Servo-operated mechanical retracts.  Bruce placed a nearly invisible hole in the rear of the canopy for battery cooling.

Eric Malkerson displayed a set of retracts which he manufactures. Available retract angles are 75 degrees, 82, 85 and 90 degrees. His design has a closed trunnion and double-cinched strut clamp. They are design to accept a 1/2" strut from Robart or Century Jet.

Roy Carrigan displayed a quarter-scale P-47 Sierra strut custom-made for the Equinox P-47. The hub was made by Dan Thiede of the ACRC club.  It features air brakes that use auto clutch material for the disk plus ball-bearing wheels.  Tires are adapted from mountain board wheels.  Further info will be on our www.mnbigbirds.com website.

Dave Andersen gave a boring, math-laden lecture on cooling techniques for cowled engines that included a history of the 3:1 area rule. Excellent Presentation!

John Baligrodzki (651.779.0434 or baligrodzki1@yahoo.com) described the upcoming annual Minnesota Scale Classic contest sponsored by the Scale Flyers of Minnesota and CD’ed by John. This Scale Masters Qualifier will be held in Owatonna on August 1st, rain date August 2.  Events will be Fun Scale Novice and Expert, combined Sportsman/Expert and Team. Top 30% in Sportsman/Expert and Team will be invited to the national Scale Masters Championships www.scalemasters.org.   Prizes will include a 2.4 radio. The move to a much bigger field is expected to draw more large airplanes.

Interesting Notes


Cal Branton, President


(651) 459-5107

Mark Prokop, Treasurer


(651) 688-6340

D. Andersen, Secretary


(952) 890-9529

Jon Bomers, Webmaster


Have a Great 2009 Flying Season!

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