SFM News Letter

April 2009

by: David P. Andersen

Our 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)

Bernie Kobilka’s PT-19 uses a Saito 160 engine.  Carved wing filet, Koverall with 14 coats of nitrate dope.  Scratch-built windscreen.  “A crash ages an airplane quick.

Cal Branton announced that the Commemorative Air Force,  Minnesota Wing wants scale models for flight and display for their Memorial Day weekend airshow in Red Wing, Minnesota. More details to follow.

Cal Branton added scale detail and rivets after his B-25 was painted.  Built by Dave Schwantz from Ziroli plans.  The aircraft uses two G23s and “Flies great ... it's effortless.”  it also uses Graupner 3-blade props and weights 33 lbs

Wayne Siewert reported on the flight of his Kondor Mustang.  Flew well with Center of Gravity further forward than shown on plans.

Steve Meyer showed his Kondor 71” Sea Fury ARF purchased at Toledo.  It uses a RCGF 26 cc engine www.zrcgf.com and weights 16 lbs.  Wire & tube connections between flap sections. Modeled after the restored “September Fury, a 480 MPH airplane" before it got its red, yellow and white paint scheme. The exhaust ports were painted with decorative Rust-Oleum paint that separates into two colors after spraying, giving a “bumpy” rust & black look.  Steve cut his own vinyl markings.

Larry Sorenson and Kevin Kaveney described their Sailplane and Super Cub tow plane project.  Balsa USA 1/3rd scale Super Cub bush plane uses 150 cc twin—big engine for towing large gliders.  The landing gear was extended 2” for additional prop clearance.  10” tundra tires are Northern Tools utility tires with the tread ground off (smelly job done outdoors) and bearings removed for lightness.  Tow plane has removable wings, tail & wheels, snap-in wing struts for transport, but can be assembled at the field with an Allen wrench in less time than it takes to fuel.  Kevin added shear webs, cross bracing and some hardwood ribs to the Balsa USA wing design.  Larry added extra reinforcing to the fuselage for the large engine.  Rudder & elevator servos were mounted in the tail to counterbalance the heavier engine.  In order to launch many gliders quickly w/o refueling, Larry increased the fuel capacity to 3 tanks in line, the header tank being visible thru the cockpit as an indicator of fuel remaining.  Tail wheel fabricated from bush plane photos at www.supercub.org, bare bones weight 44 lbs.

Kevin’s sailplane was built by Hans Bueller in Germany & Austria.  46% scale Four-piece wing, 6.9 meter span.  Kevin rebuilt the retractable landing gear and cockpit.  JR 8611 (200+ oz-in) servos.  Weight is 45 lbs.  The most powerful servo is the cable-release servo. Release height about 1000 feet.  “Aerotowing is a great way to wreck two expensive airplanes at the same time.”

Mark Dubay scratch-built his C195 from Rich Uravich plans. He had to add material to the ribs in order to sheet the wings.  The nose was not scale due to miss fitting cowl, so Mark molded his own cowl. He turned a plug on a lathe, then added the chin scoop molded from Milput epoxy.  Suspending the plug in a glass mixing bowl, he poured in art-supply-store polyurethane elastomer to form a mold. Power is supplied by an OS 70 4-stroke and the bird has 33 oz/sq ft of wing loading. Mark also added flaps and cabin doors.

Mark drew his own scale foam core floats plans using AutoCAD.  Foam from Home Depot ... “I get my modeling supplies from art stores and Home Depot.”  Fish paper patterns for foam cutting.   1/16” balsa sheet was attached to foam by applying yellow Titebond to the balsa and to the foam, letting them dry, and ironing on the sheet balsa with a sealing iron set at “high heat.”  This technique works only for balsa sheet no more than 1/16” thick.  Covered with SIG Koverall and dope.  Removable wheels for land flying ... front wheels castor.

Chris O’Connor showed a Kondor Typhoon ARF.  Sierra retracts & tail wheel. It weights 17 lbs and Chris added cannons.   Model Masters paint. Rub N Buff for chipped paint effect.  Redundant flight batteries with MPI electronic switch with an onboard Radio South voltage display.  Only one of 3300 Typhoons remain in a museum in England, part of the series Hurricane-Typhoon-Tempest-Sea Fury. Chris fitted the muffler by grinding down an installed muffler to fit the cowl.  This left holes in the muffler that were then closed by welding.

With wild eyes, Dave Andersen demonstrated a mock-up of his latest crack-pot gadget ... an aileron linkage that fits entirely inside the wing.  Made from two telescoping brass tubes and a ball link. Low play and high leverage. Limitation are a smaller servo throw, about +- 9 degrees. This should be adequate for many scale aileron applications. This idea originated within Chris Spangenbergs' column in HighFlight Magazine. (Click Drawing)

Tim Johnson gave away a bunch of airplane magazines.  Thank you Tim!

His Mig-15 was purchased from Hobby Warehouse.  Tim will install a new turbine.  Interior is cramped despite apparent fuselage size.  Includes onboard airspeed sensor.

Tim also asked for volunteers to work at the Northern Alliance Military Fly-In—August 7th, 8th, and 9th in Owatonna, sponsored by:

 Contact Tim at johnsons@myclearwave.net

Interesting Notes


Cal Branton, President


(651) 459-5107

Mark Prokop, Treasurer


(651) 688-6340

D. Andersen, Secretary


(952) 890-9529

Jon Bomers, Webmaster




“I want to be a scale modeler when I grow up.”


“But Son, you can’t be both.”

Have a Great 2009 Summer Flying Season!

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