Junkers Ju-88 (oz6133)

About this Plan

Ju-88 Bomber. RC stand-off scale model. Half-A twin fighter-bomber with retracts. For two-channel systems. Designed around the Kraft 2 channel brick and two TD .049's. Model # pl-540, from RCM October 1973.

Quote: "This VSOS (very Stand-Off Scale) JU-813 Fighter bomber was designed around the Kraft 2 channel brick and two TD .049's. The starboard engine is modified for left hand rotation by installing Cox part No. 1715 LH crankshaft. With the gear up and both TD's leaned out, thrust about equals weight (32 ounces) and the ship simply flies out of your hand on launch. With the gear down, ROG's are over so fast nothing can go wrong. Just hold a little up elevator until the model breaks ground (a matter of two or three feet!) and then climb out as steep as you want.

With both fans turning, the model displays no vices except for a slight fishtailing at high speeds. Addition of the non-scale dorsal fin shown on the plans will cure this though. Under no circumstances should the outboard side thrust be deleted unless you have a positive (and quick) method of killing both engines. If an engine should quit below the single-engine Vmc (Velocity minimum control) the ship can snap roll so quickly it's frightening - should this happen at low altitude there just not be enough room to regain speed before the ground rises to smite thee! However, all is not bad. The outboard side-thrust coupled with counter-rotating props eliminates having a torque-critical engine and you will be able to fly out of most engine-out situations if you just remember to go easy on the up elevator until you are above Vmc. Incidentally, you will recognize Vmc right off - the rudder can no longer over power the ship's tendency to turn into the dead engine!

In practice, unless one quits from a bad setting or from dirt in the needle valve, there is no good reason to fly the ship on just one engine. Set up the fuel vents on both tanks so that inverting the ship will kill the engines. Now, after about 5 minutes of flying, simply do a half loop or roll to inverted, wait until the engines stop, tap in enough additional down eleva-tor to put the gear down, and then split-S out to glide in for a beautiful landing.

Construction. Landing gear: Begin assembly of the retractable landing gear unit by cutting to size the necessary hardwood blocks. I used maple motor mount stock. Making the torsion blocks in one long piece and cutting out the middle after the other blocks are epoxied to them will help ensure that both halves are aligned..."

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