O.S. pattern motors

[JonLowe at aol.com]

John,
I am a newbie to pattern, and have no one nearby to lean on for advice.  After viewing various options, I went with the OS 1.60, using the info from Bob Pastorello's site, www.rcaerobats.net.  I am using the 1.60, with the replacement stainless sealed bearing from Boca, Mueller header, Perry pump, and a Greve pipe, swinging a 17x13 APC.  This is about as dependable engine setup as I've ever seen for any airplane.  It likes to be started upright the first time of the day, but after that, it starts easily by bumping it backwards against compression.  I took some weight out by using a lightened backplate TruTurn spinner, and got a Grade 5 prop nut at Lowe's, and used the Dave Brown short spinner propwasher and adapter as a jamb nut, rather than the heavy OS/TruTurn components. The crankcase pressure nipple comes from the FI .160, and I just drilled thru the upper left rear backplate hole.  I'm running 15% MACH 7 syn/castor fuel(Morgan fuels).  I'm currently using an A5 OS plug, although I've also used the OS #8.

I will probably go with the Aeroslave CF pipe in the future as it is lighter and shorter than the Greve's pipe; it wasn't available when I started.

The ONLY issue I've found is that it sometimes likes to blow the seals out of the plugs, even after I added an additional head gasket.  I beleive this was caused by using my gorilla starter when the engine was warm, and a minor hydro lock, as the plugs aren't blown out when I land.  I haven't had a problem since I went to flipping it backwards after the first start of the day.

Hope this helps.

Jon Lowe

In a message dated 9/8/2004 11:14:23 PM Eastern Daylight Time, "John Pavlick" <jpavlick at idseng.com> writes:

>Guys,
> I'm looking for some insight into which motor I should use in a new ship
>(Focus). I like the O.S. 1.40RX because it's got a rear exhaust, but the
>1.60FX looks nice too. If anyone has any experience with either of these
>motors (props, fuel, pumps, things that wear out, etc.) I'd appreciate their
>input. Either one is a bit of an investment so I want to make sure I'm
>making the right choice. Also if anyone has used any of the new Hyde mounts
>(with the nose ring attached to the mount) I'd be interested in hearing
>about that too.
>
>John Pavlick
>http://www.idseng.com
>
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