Do-335 "pfeil"

Current project is a 1/5 scale Do-335 from an Engel kit made in Germany.

click here for the kit distributor: Fighteraces

Kit specs:

1/5.5 scale

Power:  3w-80iTS front

              G45 rear with driveshaft

Gear:  Hawe

Wheels/brakes:  Glennis

Radio: Futaba

Finish: PPG

Weight 45 lbs

Kit contents.  Fuse is one piece molded gelcoated fiberglass. Wings and tail are foam core and balsa sheeted.

The kit is very complete, only lacking building materials, engines and radio.

Kit components. Gear, driveshaft, bearing blocks etc.

3w-80, wheel bay liners, various kit components

Tail feathers, ailerons and flaps

Some pics of the G45 rear powerplant and its driveshaft and flex coupler.

First job is to set the wing anti-rotation pins into the leading edge and set the incidence.

The included retracts are then fitted out with brakes and trial fitted into the wing.

Main wheels are 7" diameter

Wheel bay liners installed and flaps hinged. I added an extra air cylinder to the retracts to give more force to overcome air loads on the landing gear doors.

Ailerons are center hinged with a piece of music wire. Hinges are built up from balsa and ply and sandwiched into the wing.

Elevators hinged and shrouded with 1/64th ply. One set screw per side holds the elvator halves tight up against the fuselage. Both stabs are removable for transport.

The upper rudder was missing from my kit, so I built a new upper and lower from balsa and 1/64th ply. Rudder servos are positioned as far forward in the fuselage as possible. Actuation will be by pull pull cable.

Mounted the cowling using the supplied ply tabs. The tabs are aeropoxied into the front of the fuselage. Corresponding ply tabs are aeropoxied into the cowling. Bolts are accessible thru the open cowl flaps.

I installed a 1" prop extension on the 3w80 to move it back in the fuselage a bit to conceal it better. A new firewall was made from 1/2 ply and glassed into the fuselage. The cylinder head will stick out a bit but thats the price I gotta pay for a little extra power.

Rear drive shaft and bearing blocks installed. The shaft turns incredibly smooth with no runout.

OK, here's where it gets interesting. Since the rear shaft cant handle anything bigger than a G45 because of vibration, I am mixing it up a bit and installing a big Hacker outrunner. The 100/8 outrunner should provide equal power to the 3w80, not cause any vibration and not be so critical on cooling. I machined a small aluminum collar to mate the Hacker to the driveshaft flex coupler.