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Easy Model Airplane Engine Testing — Keeping it Cheap and Safe!

When ever I test run and adjust a new engine, we cite to set it adult on a stout exam stand/table instead of on a indication airplane. Here is my Zenoah GT-80, 80cc twin-cylinder gasoline engine for my Fokker Triplane that we am exam running. Fuel tank (and fume oil tank) are commissioned and a stifle linkage and stifle linkage are also worked out. But to adjust a carburetor and name a scold propeller, this is how we do it.

I make a heavy-duty, open tip box from 3/4-inch hunger play that we screwed together with piece stone screws. we afterwards combined a birch plywood face drilled to accept a engine. we used 1/4-28 cap-head bolts (the same as on a model,) and the throttle linkage is also accurately a same geometry as in a model. This way I could glorious balance a servo transport and end-points with my  Spectrum DX18 transmitter. The servo and receiver and battery container are all scrupulously commissioned in the engine exam box as is a 32 oz. Sullivan fuel tank. we commissioned a 2-line fuel setup and use a T-fitting and a fuel dot for stuffing and removal a tank. For this engine we am using fume mufflers from Slimline Products and a engine is unequivocally still and a opening is excellent. No over-heating during all.

The engine box is trustworthy to a sturdy picnic list with 3-inch-long Deck screws and is unequivocally secure. (My mother was not gratified so we suggest an aged list we can use exclusively for RC stuff).

The box is also unequivocally easy to mislay after contrast and we keep it accessible in a workshop. The birch “firewall” pad can be altered out to compare opposite engines. For contrast we used a accumulation of 24 to 27 in. propellers and I finally comparison a hardwood Falcon 26×8 propeller with glorious results.  The fuel is a gas/oil mix of 50:1 regulating Husqvarna Chainsaw 2-stroke oil. It comes in available 2.6oz. bottles ideal for blending with 1 gallon of gasoline for a 50:1 ratio.

The engine has a starter open trustworthy to a abaft finish of a crankshaft  so the GT-80 is unequivocally easy to start but using a big  electric starter.

Starting procession is: 1, tighten a stifle and open a stifle fully. 2, Grab a column and lift it clockwise to bucket a spring. 3, At a 2 o’clock position simply recover a column tip and a engine open spins a prop. After about 5 or 6 tries, a engine will “bark” to prove it has adequate primary in a carburetor. 4, Open a choke, and set a stifle only above idle with trim full open. 5, The engine starts after about 3 some-more flips and it settles into a good idle. Lowest arguable environment gave an idle only underneath 1,950 rpm and a tip finish but adjusting a carburetor was a smidge under 7,000 rpm. we used a digital GloBee visual tachometer to check a numbers.

After running  two full tanks run by a engine and tweaking a carburetor it was ready for re-installation in my Balsa USA triplane. My exam moody of a 1/3-scale Triplane (back in August,) was unequivocally successful and a engine achieved ideally not requiring any additional adjustment. we unequivocally like regulating this engine exam box setup to adjust my engines, generally vast gasoline buring beasts. Give it a try. And remember, reserve initial when ever doing and running any RC engine.

Zenoah Engines

Falcon Propellers

Slimline Mufflers

Engine shown in a unprepared Triplane. Notice clearances cut for correct cooling.

Test moody day during a drifting field. The GT-80 dismissed right adult but a hitch!

I found that  Falcon 26×8 propeller and Zenoah GT-80 combo ideal for this hulk scale triplane.


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