the Wasp

My Feedback: (1)

roller bearings

Jim

captinjohn

I would do the 10% oil in the mix. I have used more than that but it was just a test. If I remember right that is more by a fair amount than AV8TORs mix is for oil...but it should be ok. Just use a oil like Klotz that mixes good in various fuels and does not leave hardlly any carbon in the engine. I never had a plug go bad with that oil also. Capt,n PS I will look up some data I may have on Tartan engines.

captinjohn

I would do the 10% oil in the mix. I have used more than that but it was just a test. If I remember right that is more by a fair amount than AV8TORs mix is for oil...but it should be ok. Just use a oil like Klotz that mixes good in various fuels and does not leave hardlly any carbon in the engine. I never had a plug go bad with that oil also. Capt,n PS I will look up some data I may have on Tartan engines.

nitro joe

My Feedback: (2)

Here's the innards,and"Tips"paperwork of a single SuperTartan glow I have in the shop.
Never run.Notice the stout build.

I would not worry too much,about adding alot of extra oil to these guy’s standard gas/glow mix due to it's construction.But that's just me...Your milage may vary.

As for the high compression,you might cut out a couple new head gaskets ~2x the std.thickness.
Mine is just a flat aluminum ring.

captinjohn

Looks like directions says mix 8 oz oil into 128 of mentanol. Would that be 16-1 ratio? Capt,n

the Wasp

My Feedback: (1)

my manual for my Twin Glow says 10% oil,

and my manual for my Single Glow says 10% oil also,

but I have specs for the Gasser Single and it says 5% oil,

Jim

the Wasp

My Feedback: (1)

EDITED

quote ""never prop engine to turn less than 8400,, 18x10 good size prop to start with "

OK,, so I have to go down from an 18x10 to get to 8400


Jim

nitro joe

My Feedback: (2)

Edit: I'm now wondering if that "Tip" sheet included with the engine is the correct one for the Tartan single?

18x10 at 8400 seems a bit optimistic to me.
Anybody know?

From post #104
"Here's the innards,and"Tips"paperwork of a single SuperTartan glow I have in the shop."

Please take note,that the included "Tips" sheet,listing the prop size is for the "single" not the twin.

the Wasp

My Feedback: (1)

""listing the prop size is for the "single" not the twin""

yes, I understood that, I have both the single and twin..


what does everyone use for a prop on their OS 120 4st,,

Jim Cline has flown the Tartans more than anyone inside the US, he told me (on the phone) that the Super Tartan single is a little more powerful than a "good" OS 120, it would be more like a 130..

I don't know why they want it turned that high, it doesn't have that much for an Exhaust Timing, I don't think the single will even turn a 17x10 that high, the Saito 125 turns an APC 16/6 at 8000..

Jim

nitro joe

My Feedback: (2)

The “tips� sheet pictured in post 104,and shipped with my 22cc single years ago, must be for the 44cc twin .
18x10 is Zenoah G-38 territory. From that mfg. specs: �Benchmark prop 18x10 APC 7,300�

Wasp,I understand that you have both engines w/ manuals,and know this stuff. Someone else may also have the single w/o manual,trying to spin too much prop like I would have after reading the paperwork received.

captinjohn

How much more does the Tartan single weigh over a good OS1.20? That is the question! Capt,n

the Wasp

My Feedback: (1)

OK,,

I know the Twin (s) are screaming little monsters, guys report 8400 with a 20x8 and around 8000 with a 20x10,.. my MVVS 35 turns a 3W 20x8 at 7200 tuned for flight and top speed is pretty good in my plane, and my Twin is lighter than my MVVS is with Mount/Muff/Batt/Igni,, my plane would really zing with the Twin, ,my plane weighs 15 &1/2 with my MVVS,,

av8tor1977 .. I didn't see what fuel line you said you were using,, that's a question in sort LOL

Jim

the Wasp

My Feedback: (1)

""How much more does the Tartan single weigh over a good OS1.20? That is the question! Capt,n""

now you would have to go ask that one LOL

I don't know LOL

Jim

nitro joe

My Feedback: (2)

Quote:
“How much more does the Tartan single weigh over a good OS1.20?�

The Super Tartan single as shipped w/ muffler,and prop adapter,
comes out to 44oz.(2.75lb.) on a cheapy kitchen spring scale.

You'll have to check on the OS weight.

captinjohn

More data on the Tartan engines http://www.rcuniverse.com/forum/m_4600212/tm.htm Capt,n

the Wasp

My Feedback: (1)

the heaviest OS 120 weighs 32.5 oz..

http://www.osengines.com./engines/surpass.html

Jim

JohnF

Despite all the great information here for doing the conversion I think one thing has been overlooked and that is what stopper should be used on the fuel tank. I have used Sullivan, Du-Bro and Kavan tanks with the gas/glow mix but the only stopper that didn't desolve was white in color. The black and or brown (gas) stoppers did not last. So, I am hoping some of you guy's can add to this and also what fuel fillers are you using? Dubro makes nice "Kwik-Fill" ones for Glow or Gas but can either be used for the gas/glow mix?

av8tor1977

My Feedback: (6)

I have had no problems with the "For gasoline" stoppers, but I don't leave fuel in the tank after flying.

I lost my only regular gasoline/ignition powered model, a beautiful Christen Eagle biplane to the fact that a supposedly "For Gasoline" stopper dissolved and the bits made the engine quit at a most inappropriate time... []

I had tested the stopper by soaking in gas overnight and it was fine. But I forgot to de-fuel the plane after flying one time, and when I flew it a week later is when the problem occurred and it died an early death. Post mortem revealed a disintegrating fuel stopper that caused carb blockage and the engine to quit right as I was adding power to make it over a concrete wall on final approach. What a horrible "smack!" that made. I just wanted to sit down and cry...

AV8TOR

aero nut

Well sullivan products came out with a stopper that works on both Glow and gasoline fuel so it should work very well for our application
Saludos Converts

the Wasp

My Feedback: (1)

aero nut ,, I have heard of that Stoper,,

now,, what fuel line ?????????!!

Jim

JohnF

The Tygon fuel line seems to work fine with gas/glow.

av8tor1977

My Feedback: (6)

Yep. That is what I use on the airplanes. On my flight box, I just have some cheap plastic (vinyl?) tubing from the hardware store. It has gotten a little bit stiff, but has held up without problems for about 2 1/2 years using Gas/Glow fuel.

Here is a good source for tubing at a great price: http://www.rotaxparts.net/scripts/pr...?idCategory=55

Either the "Tygothane" or the blue urethane primer line works very well. The primer line is not pliable enough to use inside the fuel tank for a clunk tube however.

AV8TOR

the Wasp

My Feedback: (1)

OK thanks

Jim

captinjohn

Last time my wife was at Hospital for a test...they gave us a bunch of clear tubing in 2 sizes. I think I will try some and see what happens. Capt,n

the Wasp

My Feedback: (1)

man,,,,,,,,,,, all this talk makes me want to get to the field and fly,, but it's cold out therrr and we got a good foot of snow eeerrrr, after all these years I have learned to hate the cold and snow !!

Jim