Explore the universe
 

Welcome to our rocketry Archive. Have fun browsing!

 

(Browse for more articles)

 

How to Tune Your Model Airplane Engine

Tuning is simply adjusting your engine changing to higher pitch
for peak performance. The factory-fresh Leaner still: little smoke, max rpm
settings may be a good starting point. reached
However, you may need to compensate for Too lean: very little smoke, max rpm can
higher altitudes, or for temperature be heard falling off. Open the needle
changes with the seasons. Changes in fuel valve up 20 or 30 degrees from this
type or engine wear, may also require a point. If you have a tachometer, open the
tune-up. needle about 300 rpm less than max.
Relatively more fuel to air is known as a 5) Still at high throttle, perform the
"rich" mixture, while the opposite is pinch test. Briefly pinch then release
known as a "lean" mixture. A lean mixture the fuel tube going into the carb. If the
generates more power, but also generates engine momentarily speeds up, then slows
more heat. Too much heat could damage the back down, you're done. If the engine
engine. A rich mixture generates less does not speed up, or quits, then it is
power and less heat. Too rich and the too lean; richen the needle some more.
engine might quit while you're flying. 6) Now throttle back to idle; let the
The popular twin-needle carburetor has engine idle for a couple minutes.
two needle valves. The high speed needle 7) Now perform another pinch test. This
controls the total fuel flow into the time pinch and hold the line. The engine
engine, and affects the engine's behavior will want to speed up and die. If it
from half to full throttle. The low speed speeds up immediately, it's too lean,
needle tends to have more of an effect richen the low speed needle. It should
from half throttle down to idle. Both the take 4-6 seconds to speed up and begin to
low and high speed needles can be die. Any longer and it's too rich.
richened (counterclockwise turning), or 8) Also check the throttle transition.
leaned (clockwise turning). With the aircraft secured and engine
Tuning Procedure: idling for a couple minutes, advance the
1) Start with the factory recommended throttle quickly to fully open. If the
needle valve settings. engine hesitates, the low speed mixture
2) Start the engine. is too rich.
3) With the engine or aircraft secured, For more information about Model Airplane
open the throttle to full. Engines, visit the RC Airplane Advisor -
4) Lean the high speed needle slowly and Model Airplane Engines.
watch and listen: This article may be reprinted if proper
Too rich: lots of smoke, low pitched credit is given and all links left
sound intact.
Leaner: reduced smoke, sound starts




www.rocketrynews.com keyword stats [2007-10-27-2007-10-27]



Daily top traffic source : MSN
Historical MSN keyword trend


Most current MSN search phrases:

paper airplane models Large RC model planes
models comet model airplanes
giant scale remote control jets free realistic paper airplanes
rockets+modern development of


Other search engines trends:



Other search phrases:

anson funderburgh model rocket building
model boat plans huntsville space and rocket center
flying simulation find out how
rc plane review landing gear
electric large rc jet engines hot wheels collectors software
wood airplane models model airplane business
model rocket engine pocket rocket scion tc
the rocketry forum homemade how to
apollo rockets device
rc flying model kits ROCKETRY news
heroin





1- A- B- C- 2- 3- 4- 5- 6- 7- 8- 9- 10- 11- 12- 13- 14- 15- 16- 17- 18- 19- 20- 21- 22- 23- 24- 25- 26- 27- 28- 29- 30- 31- 32- 33- 34- 35- 36- 37- 38- 39- 40- 41- 42- 43- 44- 45- 46- 47- 48- 49- 50- 51- 52- 53- 54- 55-