There are lots of good reasons to use gasoline engines to power your model airplanes. When you fly giant-scale airplanes, reliable engine performance is of upmost importance. Generally speaking, gas engines are also very easy to start and run very consistently while producing their peak power at lower rpm settings than glow engines of similar displacement. These lower rpm tend to produce lower noise levels while also burning less fuel per minute as compared to nitro burning 2-strokes. And there’s the added benefit that gasoline is a lot cheaper than nitro glow fuel.
But as with all things RC, to operate properly, your gas-fed engine needs to be installed and set up correctly. Let’s take a closer look.
Installations start with properly centering and attaching your engine to the model. This can be done with soft or hard-mounting points. Hard point mounting can be as simple as drilling holes in the firewall and bolting your engine directly into place. For engines with rear mounted carburetors, this will often require using long metal standoffs. In both cases, the mounting hardware (nuts and bolts), need to be secure and tight. For lightly built airframes, soft mounts are often used. These include rubber isolators that separate the mounting bolts from the firewall. They also minimize the amount of engine vibration that finds its way to the rest of the fuselage structure. Be sure to follow the airplane’s instructions for side and down engine thrust angles.
It is preferred to have all your hardware, engine, muffler and fuel system before you begin building your model. This way you can make changes to items like firewall placement, to avoid excessive modifications after the model is assemble to fit your engine and fuel system. A little pre-planning will save a lot of effort afterwards.
After you’ve installed your engine properly, the next step is to work out and install your throttle and choke linkages. Start by installing your throttle servo. I prefer to use 4-40 music wire with a threaded on heavy-duty ball-link at the carburetor and a soldered-on metal clevis at the servo. You can determine the length of your throttle pushrod by using your transmitter to position the throttle arm all the way to the idle position with full down throttle trim setting. Here too you should visually confirm in which direction the servo needs to move to open and closed the throttle. Since one end of the linkage is threaded you can fine-tune the length mechanically after you solder the clevis into place. The overall throttle travel endpoints can be fine-tuned by programming the travel volume or endpoint adjustments. I personally like to remove the return spring from the carburetor throttle arm to minimize the throttle servo drain on the receiver battery pack. Once this is all done, be sure to remove your throttle linkage and use a solvent to remove all the solder flux to prevent corrosion later one. For the choke you have the option of using servo control or a simple mechanical linkage operated by hand. Using a servo also provides an emergency engine shutoff during flight.
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IT'S ALL IN THE DETAILS
2020 TOP GUN SCALE INVITATIONAL
TOP GUN SCALE INVITATIONAL
THE 32ND YEAR OF EXCELLENCE!
THE COMPETITION CONTINUES
Every spring, Frank Tiano’s Top Gun Scale Invitational has heralded the beginning of the flying season, offering builders an opportunity to show off their projects in Lakeland, Florida after a winter spent finishing them in their workshops.
BUILDING BENCH & WORKSHOP TIPS
I have built countless RC models, from kits, plans and even my own scratch designs.
TOP GUN FAVORITE MARK CHAPMAN'S 1/3-SCALE ALBATROS D.VA
When I told Model Airplane News executive editor Debra Cleghorn that I was attending the Top Gun Scale Invitational for the first time, she asked me if I would interview the pilot of one of my favorite planes at the event. As a WW I fan (and a Balsa USA builder), I chose Mark Chapman’s beautifully detailed 1/3-scale Balsa USA Albatros D.Va, flown by Marvin Alvarez in Team Scale.
HEAVY-DUTY SCALE FLAPS
FUNCTIONAL CONTROL SURFACES WITH ADDED DETAIL
SEAGULL MODELS/LEGEND HOBBY SAVAGE SHOCK CUB
A short takeoff and landing wonder!
GETTING STARTED IN FPV
BetaFPV makes getting a bird’s-eye-view easier than ever!
AILERON/RUDDER MIXING EXPLAINED
Build good habits now and fly better tomorrow
BRITTEN-NORMAN - DEFENDER 2000
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Jan Akkerman – “Hocus Pocus”
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MEGHAN'S SIS EXPOSES UGLY LIES!
DUCHESS Meghan’s furious sister, Samantha Markle, is blasting Harry’s wife for playing the victim and using “depression as an excuse to treat people like dishrags.”
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Bargain-hunting travelers have long fattened the profits of duty-free shops, but Covid-19 travel restrictions have hammered those perfume suffused emporiums.
PRINCE WILLIAM'S TIPPLING HAS KATE RED IN THE FACE!
Royal brew-haha over boozing
HOW A FRANCHISE WAS BUILT
In 1981, Baseball America was launched to fill a void in scouting and player development coverage
Briscoe Western Art Museum hosts a traveling exhibition dedicated to contemporary Chickasaw artwork through January 18.