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- Newsgroups: rec.models.rc
- Path: sparky!uunet!ftpbox!mothost!white!rtsg.mot.com!svoboda
- From: svoboda@rtsg.mot.com (David Svoboda)
- Subject: Re: First Trainer Questions
- Message-ID: <1992Dec29.161420.26352@rtsg.mot.com>
- Sender: news@rtsg.mot.com
- Nntp-Posting-Host: guppie44
- Organization: Motorola Inc., Cellular Infrastructure Group
- References: <1992Dec20.170241.973@bnr.ca>
- Date: Tue, 29 Dec 1992 16:14:20 GMT
- Lines: 58
-
- In article <1992Dec20.170241.973@bnr.ca> martyg@bnr.ca (Martin Gallant) writes:
- |Over the last two weeks, I have been studying various R/C aircraft
- |guides and magazine back issues to bet a feel for what the hobby is all
- |about, and have decided to jump in after the holidays.
-
- Welcome. It's a fantastic hobby.
-
- |I plan on flying
- |a .40 trainer in a club, with the help of an instructor.
-
- Good call.
-
- |I have narrowed down the engine selection to the OS.40FP (~$70) and the
- |OS.46SF (~$140), the latter strongly recommended by my local hobby shop.
-
- Why don't you ask your instuctor what he thinks? You should involve an
- instuctor in every step of starting out, even if you are simply "building"
- an ARF. There are always lots of places to go wrong.
-
- A hobby shop is an unreliable substitute for a caring instructor.
-
- |Do I need to be messing around with ball-bearing engines for my first
- |plane, or is a plain bushing motor adequate? I am prepared to spend
- |whatever time is required for break-in on a test bench.
-
- My opinion: go with the plain bearing. You have to take special care of
- a ball-bearing engine (after-run oil, ALWAYS), or get accustomed to
- replacing bearings occasionally. You can really bang around a sleeve-
- bearing motor without problems. And the 40FP is a Schnuerle-ported
- snorting monster compared to the sedate 40's that most trainers were
- designed for. In other words, plenty of power for your uses. The
- plain bearing motor would be inappropriate for tuned-pipe, high stress
- applications, however.
-
- |Coming from an automotive background, I am quite concerned about running
- |an engine without any type of air filtration. My club files on a dusty
- |grass field. I know there are commercially available filters on the
- |market, but these represent a compromise between reliability and
- |longevity. Should I bother with these, even just to satisfy my
- |paranoia?
-
- By all means, if you are really worried, give filters a try. The best
- air filters I have used are simply a little peice of ladies' nylon
- stocking held over the carb opening with an o-ring. The Varsane
- (formerly Perry) foam filters tend to clog with raw fuel, and have to
- be squeezed out every other flight.
-
- But actually, few people use air filters on airplanes. That said, most
- people have a shorter engine lifespan than they might. I personally
- don't use one, normally, but I take great care not to run the engine
- in a lot of dirt. I see too many people run the motor at full throttle
- while holding the plane on the ground, generating a huge cloud of dust.
- The engine is eating a lot of that dust. I figure that when actually
- taking off, since the airplane is accelerating forward, the engine is
- mostly out of the dust the prop and wheels are kicking up. And there
- isn't much dust up in the air.
-
- Dave Svoboda, Palatine, IL
-