Which is better?? OS 40 FP or OS 40 LA
Roger Sturtevant
R/C Report in the recent issues had very good things to say about the LA.
Also it has the remote needle valve which is nice and it is supposed to be
pretty quiet. Not noted to be a great hand starter, but I'll bet the FP
isn't either.
Brian Calkin wrote:
> I am now sending back my Tower Hobbies engine and am going for either an
> OS 40 FP or LA. What is the diffrence between the two? Which is more
> reliable as far as running and tuning?
>
> This news group has been a great help to me these last few months in
> getting the right set up for my new RC experience. Thank You All for
> your help.
>
> Brian Calkin
Tony De Bondt
But ...
The LA enginge has a plastic backplate with the needle holder on it.
Even in case of a mild crash the thing tend to break.
The LA alsa has some trouble with bubbles in the tubing from the needle
to the carbu.
Tony De Bondt
Dender Eagles - Belgium.
Brian Calkin
Ian Maclaughlin
Tony De Bondt <ek...@skynet.be> wrote:
>But ...
>
>The LA enginge has a plastic backplate with the needle holder on it.
>Even in case of a mild crash the thing tend to break.
>The LA alsa has some trouble with bubbles in the tubing from the needle
>to the carbu.
>
I'm in agreement with Tony's observations, but there are some plusses
to consider for the features mentioned:
a. When an electric starter is applied to a bushing engine, the only
thing to prevent the crankpin from pushing into the backplate is the
prop drive washer contacting the front of the crankcase. If clearance
is sloppy, which it will be eventually if not while new, the crankpin
rubs metal particles off the backplate, and these will find their way
to the glow plug, coating the element and rendering it incapable of
catalyzing the ignition of the fuel charge. OS may have considered
this in the decision to use a plastic backplate - though it would seem
a simpler solution would be a teflon bearing insert into the crankpin,
as often used on the piston pin ends.
b. The reason for the remote needle valve location is of course to
save your meathooks. More potential for air leaks is the price paid
for this, but easy enough to remedy. Keep the fuel connections tight
as always. You just have two more to look out for.
Ian
San Diego
DIXON GARAGE
The OS 40FP has 6 head screws and 1/4-28 threads on the crank. The
OS 40LA has only 4 head screws and 6mm threads on the crank.
I'd stick with the OS 40FP!!! -DIXON GARAGE-
Alvin
Roger Sturtevant wrote:
>
> R/C Report in the recent issues had very good things to say about the LA.
They ain't wrong one bit...the 40LA is really good value!
> Also it has the remote needle valve which is nice and it is supposed to be
> pretty quiet. Not noted to be a great hand starter, but I'll bet the FP
> isn't either.
On the contrary, I do hand starts all the time and with just a flick or
two, my 40LA is roaring!
Just thought I'd add a bit more stuff...I have found the 40LA is run
excellently on a 10x6 at 11700rpm. Try it!
Alvin
Tony De Bondt wrote:
>
> But ...
>
> The LA enginge has a plastic backplate with the needle holder on it.
> Even in case of a mild crash the thing tend to break.
Mine did break off due to stress after 6 months of running it. But
actually, if you think about it, the metal backplates do break off due
to stress too after some time.
However, the 40LA is a great engine for the low price as well as it
being a bush engine. Good enough power for most 40 size planes and damn
reliable after a few runs...idles very well too...no dead sticks when
tuned right.
> The LA alsa has some trouble with bubbles in the tubing from the needle
> to the carbu.
Once it is up and running, this isn't a problem.
John Rumbaugh
I got a 40 and a 60 FP.
Many hundreds of flights on the 40 with
no trouble. Easy hand start, one or two flips and your off.
Link to my recreation, marine aquariums and r.c aircraft web sites.
Thanks. John.
http://www.angelfire.com/mi/JohnnyrumsRecPages/index.html
ama-dist-8_list
go look and see http://www.AMA-Dist-8.org http://www.AMA-Dist-8.org
http://www.AMA-Dist-8.org http://www.AMA-Dist-8.org also look n see AMA-Dist-8
LIST AMA-Dist-8 LIST AMA-Dist-8 LIST AMA-Dist-8 LIST located on
http://www.AMA-Dist-8.org sfr...@tenet.edu
Gerald43
OS 40FP
+'s: Proven track record for good running and OS reliability.
-'s: damn air-bleed carburetor!
OS 40LA
+'s: damn cheap, remote needle valve, looks nice in blue.
-"s: plastic backplate, odd size prop shaft, air-bleed carb, not yet a
proven runner.
Gera...@aol.com
"Batman"
Joe Walker
Just my thoughts, but don't was your money on either! Spend the extra
bucks for one of the FX series motors (40 or 46FX). In the long run,
you'll be glad you did. They aren't that much more expensive, will give you
better reliability, last longer, and will be better for your next airplane!
Happy flying.
Brian Calkin wrote in article <3427CCF6...@zelacom.com>...
James D. Jones
Brian Calkin <cal...@zelacom.com> wrote in article
<3427CCF6...@zelacom.com>...
> I am now sending back my Tower Hobbies engine and am going for either an
> OS 40 FP or LA. What is the diffrence between the two? Which is more
> reliable as far as running and tuning?
>
From what I have been able to determine, the Tower 40 and the OS40FP
are very much alike. If you didn't like the Tower 40, chances are you
won't
like the OS40 FP either. You didn't say why you are returning your engine,
but if it's for lack of power you might consider the Thunder Tiger instead.
My OS 40 FP has been a no trouble engine. It's also light, making it an
obvious choice for small planes. But, if you need more power ....
--
Jim Jones, Wachusett Barnstormers
North-Central Massachusetts AMA 501383