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Old 10-21-2019, 11:45 AM
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Thanks Lonnie,

Actually the stuff is all pretty easy and basic. Surely anybody in our core group here would've right at home after a few parts on the lathe. The more you make, the more you want to make.

A little beating the bushes, local newspapers, Craigslist, eBay, garage/estate sales etc can turn up a nice machine at often very good prices.
Old 10-21-2019, 12:45 PM
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I have the equipment and tooling, but never really put the thought into buying materials. LOL I would have to come up with plans to actually make something so I would have a BOM, then can actually start using them. Of course I still need a DC power supply for the CNC.
Old 10-21-2019, 02:04 PM
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A lot of good lookin stuff.

The 82 crankshaft came today and then I hit another snag, the rod I thought belonged to the 82 was too long, I had another shorter rod and it was too long too. Horizon is fixing me up.
Old 10-21-2019, 03:26 PM
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Default Test runs on Rebuilds

FA45

APC 11x6
Morgan's 15%
F plug
2150 / 9650
What a sweetheart to run. Very docile, hand starts with a flip or two. Easy on fuel and needles well.


Crunchy's FA50

APC 12X6
Morgan's 15%
F plug
1950/ 9850
What an animal, very near to FA56 power. Snorty but well behaved. Easy to needle.
Once the new tappets break in I'll be doing further testing with this one.

Last edited by Glowgeek; 10-21-2019 at 03:55 PM.
Old 10-21-2019, 03:51 PM
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Gary, care package received, lots of goodies in there. Thanks a bunch!
Old 10-21-2019, 03:51 PM
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Yup Gary I have been looking into a new lathe. The one that I have a good friend of mine gave me that was his dads worked ok but war out would be an understatement the bed needs to be straightened 4 inches from the head the belt blew off so when I replace the belt I did something wrong tighten the bolt too tight somewhere and cracked the housing that holds the shaft for the jaws now I have a parts machine if you know anybody looking part’s for a craftsman lathe.
but like you stated it is really cool to make your on parts.
I have not graduated to threading things but have mad bushings and adapters. Also cut the inside of a .15 rc car engine out to except a 15 magnum piston and sleeve.
Only problem the car rods are a bit stronger then a airplane rod. About the fourth or fifth run the kid zinged the motor and threw the rod again. But I was able to fix something for someone all with the ability to use a metal lathe and having access to one. Now I am saving my money to buy a new one because I don’t need a 60” table with 12” swing.

Last edited by Captcrunch44; 10-21-2019 at 03:54 PM.
Old 10-21-2019, 04:20 PM
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[QUOTE=Glowgeek;12558166]FA45

APC 11x6
Morgan's 15%
F plug
2150 / 9650
What a sweetheart to run. Very docile, hand starts with a flip or two. Easy on fuel and needles well.







That is exactly what I like about mild cams and medium compression

Glad the package is in good hands, enjoy. Plenty of options in there

:11a:


Crunchmeister:

Keep your eyes open for a 10 inch Logan or Montgomery Wards lathe (same thing).

Plenty of stuff available for them.

Last edited by Jesse Open; 10-21-2019 at 04:24 PM.
Old 10-21-2019, 05:13 PM
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Originally Posted by Hobbsy
Jim, I have a Tartan 1.34 single with a Davis Diesel head on it.

yes, I remember. they are great engines

Jim
Old 10-21-2019, 06:28 PM
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Originally Posted by the Wasp
yes, I remember. they are great engines

Jim

I ran one in a Laser for about 4 years. Discovered that by hinging the reed valve on the opposite side you pick up about 400 rpm! I had to make a new reed block. Never got around to using the OS carb and expect that too would have picked up a bit of scrote. Also converted mine to a breaker point spark ignition to prevent unexpected reverse running. The engine was stolen from me in 1986 and turned up on eBay two years ago.
Old 10-22-2019, 01:12 AM
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Originally Posted by Glowgeek
Dave, Gary, Crunchy, thank for setting me straight on the aluminum seats. Unplated it is!
Never take a backward step here lonnie i'm still swearing any one of my fa115's will blow the beer froth off a pint of beer on the test bench better than any fa125
Old 10-22-2019, 02:45 AM
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Hey Pete, after how man beers does that happen?

I kinda blew yesterday and played all day, all engines are off planes for annuals. I may put different engines on some just to put time on the others. For example, the FG 11 will go where the 62 was on the black and white LT 40.
Old 10-22-2019, 04:11 AM
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Originally Posted by Rudolph Hart
Never take a backward step here lonnie i'm still swearing any one of my fa115's will blow the beer froth off a pint of beer on the test bench better than any fa125
Patient man Time will tell
Old 10-22-2019, 04:57 AM
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Originally Posted by Hobbsy
Hey Pete, after how man beers does that happen?

I kinda blew yesterday and played all day, all engines are off planes for annuals. I may put different engines on some just to put time on the others. For example, the FG 11 will go where the 62 was on the black and white LT 40.

I usually run freshly repaired engines on planes instead of the stand. Gives a real world assessment .
Not unusual to have five different engines on one plane in one month of flying.
Old 10-22-2019, 06:15 AM
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I know what you mean, the firewall on my H9 Ultra Stick Lite looks like over done Swiss cheese. I know, I have lot of useless numbers in my Dave's Engine RPM chart. Not useless to me when comparing props, etc.
Old 10-22-2019, 07:27 AM
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Let me know what prop you put on the FG-11 when you slap it in the LT-40. I want to try different props to see what it can do. I think I have an 11x7 on it now, but not anywhere near it to check.
Old 10-22-2019, 09:38 AM
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Turning a Graupner G-Sonic 12x7


Max rpm after one full hour and 10 teaspoons of gasoline.
The 12x7 Graupner was a little light considering that Horizon says the Bench Mark is 8,800 with a 13x7. I ran it on 90 octane ethanol free and 20 to 1 Mercury two stroke oil.
Old 10-22-2019, 10:36 AM
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Originally Posted by Jesse Open



I usually run freshly repaired engines on planes instead of the stand. Gives a real world assessment .
Not unusual to have five different engines on one plane in one month of flying.

Care package received here also Thankyou much. Big muffler will go tomorrow, no pipe for it though, sorry about that.
Old 10-22-2019, 11:26 AM
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Thanks Dave, pipes are easy to make
Old 10-22-2019, 11:46 AM
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I hit the speed limit today.
Old 10-22-2019, 01:39 PM
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Originally Posted by Hobbsy
I know what you mean, the firewall on my H9 Ultra Stick Lite looks like over done Swiss cheese. I know, I have lot of useless numbers in my Dave's Engine RPM chart. Not useless to me when comparing props, etc.

Far from "useless" they give good comparisons, engine to engine under very similar conditions.
Old 10-22-2019, 02:43 PM
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In regards to engine mounting I fellow flyer in are club made a universal mount for all his engine’s he could mount anything from 40 to a 120 in the same spot.
Old 10-22-2019, 03:25 PM
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Well Dave, those 12x7 numbers on the FG11 piqued my curiosity and benchmarked at 8800 with a 13x7? Here I thought the FG11 was just a gasser 62b, not so. A little research showed it's actually a .67 cubic inch engine; a 45s/50/56/62 19mm stroke and a 72/80 27mm bore. Apparently that's just enough increase in displacement, along with cdi, to offset the weaker energy density of gasoline vs. methanol.

Are there any concerns with valve seats burning using gas in an engine head originally designed for alcohol ie fa200r3? Gas combustion does produce quite a bit higher exhaust gas temps than alcohol based fuels. Saito claims the FG21 has newly designed valve seats, no mention of that with the smaller gassers. Anyone ever have a look inside a saito gasser?

Saito knows what they're doing, no doubt, I'm just curious what the newly designed valve seats are all about and why they redesigned.

Last edited by Glowgeek; 10-22-2019 at 03:50 PM.
Old 10-22-2019, 03:55 PM
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Interestingly, the factory has the timing at 40 degrees btdc. When I first put my degree wheel on there I thought it had slipped. I'll look in the exhaust port tomorrow and see if the bronze goes all the way down to the seat.

The FG 21 is larger than the 125 also with a bore of 1.26" where as the 125 is 1.24".

Last edited by Hobbsy; 10-22-2019 at 03:58 PM.
Old 10-22-2019, 05:47 PM
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Originally Posted by Rudolph Hart
Never take a backward step here lonnie i'm still swearing any one of my fa115's will blow the beer froth off a pint of beer on the test bench better than any fa125

not only that, the 115 is prettier, yee-up

Jim

Last edited by the Wasp; 10-22-2019 at 05:55 PM.
Old 10-22-2019, 05:57 PM
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Lonnie,

Yes, exhaust valve temp can be an issue with gassers. One possible "modification" would be wider seats. When we had the auto machine shop it was common practice to cut broader seat face bands on heavy duty, truck, industrial, marine engines. The lighter duty car engines got narrower, better flowing seats. The wider seats were better at transferring heat away from the valve face.


The 115 is downright LOVELY!

Last edited by Jesse Open; 10-22-2019 at 06:19 PM.

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