JAG Engines Ryobi 31cc powered Hangar 9 Ultra Stick

by Dan Egelhoff

Overall very appealing.

It fits the firewall perfectly.

Right side shows the simplicity.

Be sure to mount the Rudder and Elevator servos in the tail for more positive control and CG correction.

Right side showing the Rudder servo mounted toward the top of the fuselage.

Baron von Reichtofen der Fluggen Pooch says it all.

The only modifications for the Ultra Stick "31" are the following:

  1. Use a Sullivan 10 oz gas tank tank configured for Gasoline.   Gas/Ignition engines require only about 1/2 the fuel volume compared to Alcahol ("glow") engines. Your savings will continue to build even if the gas prices soar to over $20 per gallon.
  2. You can utilize the lower left (facing forward) standard mounting hole on the firewall but use SAE standard 10-32 blind nuts and bolts for all engine mounting holes if you use the JAG Engines investment cast motor mount.  The remaining three motor mount holes will have to be drilled per the motormount.  They will all find good solid wood in the die cut firewall.
  3. Mount your throttle servo on the left side in the supplied servo tray.   Route the throttle pushrod along the left side of the fuselage and to the bottom of the firewall. Run the pushrod inside the motor mount ring about 1/4 inch up and to the inside from the lower left motor mount bolt.  A good practice with ignition engines is to maintain 4 inches of insulation between metal parts coming from the engine and radio components.   Therefore I put at least 4 inches of plastic nyrod between the metal pushrod that attaches to the throttle servo and the metal rod that connects to the carburetor.   This, then, requires a piece of outer nyrod as a guide glued along the left inside of the fuselage to stiffen the pushrod .
  4. Since I have the "quad" flap arrangement running four servos in the wing, I am carrying a 1,100 MaH, 5 cell battery pack.  It is now located in the tail half way between the wing and stab, wrapped in foam so it won't move.  I don't like to add any dead weight so would rather move around what I have to carry than put lead in an airplane. The CG is perfect now and it will do square loops easily.  The only servo in the servo tray is the throttle servo so I have mounted the receiver on that tray with rubber bands and insulated with foam rubber.
  5. Finally, mount both the Rudder and Elevator servos in the rear - just ahead of the final bulkhead in front of the Stabilizer.   I staggered them - One up and one down to allow standard size servos to be used without the bottoms of the servos touching inside the fuselage.  Be sure to use 4-40 size rods and linkages here. I used 4-40 threaded rod bonded inside K&S T6 Aluminum tubing. This is both strong and attractive.

    With this modification, my Ultra Stick is getting alot of flying now. The engine is a "flip and fly" setup. I don't have to remember to bring the nistarter and can even leave the clean-up spray and paper towels at home. I use my standard electric starter and the engine starts every time.   Take-offs easily turn into immelmans or loops.   It won't quite hold a tork roll but it is fun trying to hold it steady before it falls off.  That's not bad for a 13 pound airplane.    A 16 x 6 Zinger prop is ideal. I didn't have one so I cut down a 18 x 6 to 16 inches.   This leaves a pretty wide blade at the tip but the JAG Ryobi 31 handles it very well. It winds up on the straight and level and doesn't seem to bog down on the verticals.

    I am very happy with this combination and can't wait to charge up and get back out flying.

    LATEST DEVELOPMENT

    May 27, 2001

  Ultra31-Electro1.gif (123312 bytes)

The "Ultra Stick 31" - ELECTRIFIED

With the C&H Ignition Module

 

Addendum

  We have now "Electrified" the Ultra Stick 31 with the C&H Ignition system.

We had to cut a hatch in the bottom of the nose about 3/4" behind the firewall and about 2" long (enough to fit the battery and Ignition Module through the hole).  This also required moving the fuel tank back to about 2 3/4" behind the firewall and we put the ignition battery and module ahead of the tank.  It is a good thing that these carburetors have no trouble pulling the fuel from the tank.  You will need to pad the ignition battery and module with foam and run the High Tension spark plug wire through a hole in the center of the firewall and out through the motor mount to the spark plug.  There is plenty of room.  Also mount the ignition switch on the side of the fuselage.

This is an easy conversion and should give the engine enough power to "Hang" all day.

 

 

  Click here to email JAG Engines

Snail mail:

  JAG Engines
  16073 Muscatel
  Hesperia, CA 92345
  (760) 244-7270

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         Dan Egelhoff

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