Conference vmszoo::rc

    Re: .-1,
    
    I know what you're talking about but can't for the life of me remember
    the manufacturer's name.  Jomar sounds right but there may be more than
    one company producing such a device.  There's an outfit that makes on-
    board glo-ignition systems that [I believe] also makes twin (and multi)
    engine synchronizer systems but, as I said, I can't bring the name to
    mind.  Can anyone else supply the mfgr's name and other info requested?
    
    If the name is, indeed, Jomar, here's the address and phone number:
    
    	Jomar
    	2028 Knightsbridge Dr.,
    	Cincinnati,
    	Ohio	45244
    tel: (513) 474-0985
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				|      |        / |\	   	       
      	         \|/		|______|__(o/--/  | \	   	       
      | |        00	       <|  ~~~  ____ 04 ---- | --------------------
    |_|_|        (O>o		|\)____/___|\_____|_/	   Adios amigos, Al
      |     \__(O_\_	        |	  |___/	 o	   (The Desert Rat)

    Hmm, until I read Al's reply, I figured .0 was talking about
    and electronic speed control...  Now I am not sure...
    
    So, .0, are the engines electric or liquid fuel??
    
    I have glanced through the latest Tower's catalog and did not see
    anything that fit the bill, but they do not carry Jomar products.
    
    If they are liquid fuel, you might want to ask why matching of RPM's 
    is so important...  Somewhere in here, Al wrote a good note about 
    tuning multi engine planes...  I will try to find a pointer..  But
    what it boils down to is that you do not really have to match RPMs...
    
    cheers,
    jeff
    

    I've seen JOMAR advertise a synchroniser for wet power, though I've no
    idea how it might work.  

    Just to clarify, the synchronizer system is a fairly complex/hi-tech
    add on for twin (or multi reciprocating, not electric) engine aircraft.
    
    Basically, a Hall-effect magnetic sensor is mounted to each engine so
    RPM's can be monitored.  One engine is designated "master" and the
    other(s) "slave(s)."  The master's RPM is read and the slave matched to
    it through (I think) a servo-operated, in-flight adjustable needle
    valve.  As I recall, Only the slave's mixture/RPM can be adjusted and I
    seem to recall some sort of fail-safe feature accomodates for the
    complete loss of an engine but can't remember just what it does. All-in-
    all, a lot of extra gadgetry to carry (and for something to go wrong
    with).  The extra space required and the additional weight of the
    system seems to suggest that this system may only be practical for a 
    fairly large model.  As I recall, the system is somewhat expensive and
    requires a fairly lengthy and precise installation procedure. 
    
    As Jeff mentioned, I personally, wouldn't recommend the system but
    concede it might have some value for someone not that familiar with
    running model engines or who couldn't discipline themselves to use the
    tuning methods I've espoused on several occasions.  Hopefully, Jeff can
    find a pointer to the discussion on operating/tuning engines for twin/
    multi application. 
						 __
				|      |        / |\	   	       
      	         \|/		|______|__(o/--/  | \	   	       
      | |        00	       <|  ~~~  ____ 04 ---- | --------------------
    |_|_|        (O>o		|\)____/___|\_____|_/	   Adios amigos, Al
      |     \__(O_\_	        |	  |___/	 o	   (The Desert Rat)

    Thanks to a carefully placed keyword and the keyword directory listing, 
    I found Al's message under the P-38 discussion, specifically 1193.8 and
    a couple of replies..
    
    happy reading!
    
    jeff
    

Great! Thanks for all the info so far. I'll read the note mentioned in 1193.8
and see what I can translate for my uncle. I don't even know the size of the
model. Since he lives in the country of northern France, it is possible that
this is a large plane and they might by willing to pay the price and
installation hassles of the regulator. I will find out what kind of engine they
are using etc just to clarify things if necessary.

ttfn...lc

Just a quick update and a word of thanks. I called JOMAR and he is indeed the
person who makes the regulator. It costs $75.00 and he even shipped it directly
to my uncle in France for $7.00 more. Cheap! The guy is on cloud nine. He
believes that he could have eventually built his own, but then he wouldn't have
been able to build the plane in time for the competition on July 14th, 1991 in
France.

He is building a 2 engine Piper, shoot I forgot the model, and the detail he
has to have is incredible. All the door handles, body parts, landing gear, etc
are handcrafted to prefection. At least he hopes so :^)

He handmade his own landing gear, including turning the aluminium struts and
built a valve so that they can be lowered and raised by air pressure controled
from the radio on the ground. He did it right too. If there is an air leak they
lock down not up! At least that way he can still land.

Why am I going on about this in a notesfile where everyone does this kind of
stuff all the time? It's the first time I've ever been this close to it and I
am amazed! My hat is off to all of you.

Thank you all for the help and the address. I'll try to remember to let you
know if he wins next summer!

ttfn...lc

    I'm impressed.  I've been doing RC since they invented proportional
    radios and I don't have the time, patience or the skill needed to do
    that level of detail and I am in awe of those who can.  I don;t think
    you will find very many (percentage wise) in the hobby who can do that.
    Thanks for the information.