Have any of you tried this mix in a large Supertigre glow engine? Since the large Tigres run 10% oil, mixing 2 parts gasoline to one part
methanol sure gets the fuel cost down. Reading all the various experiments, it would seem all one has to do is take your proven mix and add five more ounces of oil per gallon.

No, I haven't tried that. What I would like to find out, is how to convert a large Super Tiger to use this mix. Putting the pumper carb on is a no brainer, but how do I convert the rod to roller bearings and harden the crank pin to survive with them????

AV8TOR

how much adjust is there on the carb? What type of bearings /bushing does the enging have. Wouldn't want to burn them out from lack of lube.

I'm guessing the stock carb would work, though I would change it over to a pumper carb like we have on our conversions. The rod has bushings, that's why he suggested using more oil than we do in our Gas/Glow mix. The large Super Tiger engines spec 10% oil instead of the more common 18% for most glow engines. I would rather convert it to roller bearings and use our standard mix.

AV8TOR

Red Baron Mike

i May be misunderstanding but seems like your would be short on oil. (3 gals of standard (gas/glow) mix and 15 oz additional of oil is about 6.9% for oil)

To 132 oz of 80-10-10 (MON) adding 236 oz of gasoline and 26 oz of oil yeilds final mix: Gas 59.9% , Meth 26.8%, Oil 9.9%, Nitro 3.4%.. Which approximates the methonal and nitro of standard g/g mix

I don't think you need to change the rod. The big Tigres run on zero nitro and 10% oil. If I am missing something, isn't your special fuel mix containing about 5% oil? If it is or isn't, raising it to 10% won't be difficult.

Mike

A couple of years ago I sold a ST 3000 for a friend here on RCU. It was a Ralph Cunningham custom with a roller bearing rod, ignition, the whole works (Ralph can provide more info on this if he is following this forum). Apparently he bored the crank end of the rod and installed a roller bearing, then turned down the crankpin and pressed-fit a hardened steel sleeve over it. I don't remember if anything was done on the small end of the rod. As I recall, it was set up to run a 32:1 gas/oil mix.

The mix that seems to work the best:
Gasoline 66.7%
Methonal 26.7%
Oil 3.3%
Nitro 3.3%

I have a ST 3000 running on gas/EI. A carb adaptor is abailable from CH. I normally run 8% oil and it does not creat much mess. Just a few black spots which clean off easily. There is no reason why one of the big STs wouldn't work OK on the gas/glow mix with 8%-10% oil.

In the past there has been several threads about converting the ST rods to needle bearings. I believe that A & A still offers this conversion. However, Ralph Cunningham no longer does this conversion because the crank metal is too soft and leads to fairly quick crank failure.

Hello again;
I finally got some time to resume my testing. I see there has been some excellent advancements since I was tinkering around with you guys.

I still have not got to the point were I dont need the glow plug powered up all the time.

So today I went to the LHS but they did not have any of the prefered 10/10 blend so I picked up some SIG 10% nitro and 18% oil.

I mixed that 1 part sig fuel to 2 parts gasoline. I realize I am a little heavy on the oil but it should be pretty close. I still cannot run the motor without the glow plug powered up. It runs excellent with power on the glow plug but once the power is removed it dies pretty quickly.

Any comments on to what I am doing wrong here? 45cc homey.

On a side note I soldered a wire to the glow plug so I could use an onboard glow battery but the glow plug gets to hot and melts the solder off so I cannot fly until I get that worked out.

Dan

what i did was: XP extreme heli (15%nitro 14% oil) and "watered it down" (added about 32.5% methanol to the glow fuel)with methanol, and when mixed 2:1 with gasoline, i got a final result of: 3.1% oil, 3.3% nitro, 26.8% methanol, 66.8% gasoline. it seems to work fine, b/c my engine runs really well and is still running. A few hundred posts back someone stated that the reccommended mix using (10-10) was a bit heavy on the oil, so i opted to use this one. my ryobi was designed to run on 40:1 wich is about 2.5% oil content, so it should be ok in the long run.
as far as the glow plug problem, use a wheel collar to hold the wire on, but make sure it doesnt short out on the plug body.
and did you try a hotter plug? i use a hangar 9 4cycle plug with no problems

Wheel collar great idea!!!

Let see here my mix would be 2.5% nitro 4.5% oil 50% gasoline 43% methanol barring any additives in the sig fuel.

Andrew if you mix 2 to 1 gas to your other blend would'nt that make 50% gasoline?

I am not sure what glow plug I have in it. I am going to pick up a 4 stoke plug this week.

Just a thought here. I am not that good a tuning the motor. Maybe I have the low and high too far open causeing it to flood out with no power on the glow?? It runs so good now that I dont want to mess to much with the needles. If I lean the top end down any further it starts to choke out if I open the top end any more it starts to blubber.

Messing with the bottom end it doest seem to have that much effect it is open alot right now.

Dan

2 parts of gas and 1 part of glow fuel= about 2/3 two thirds gas. I Think Capt,n

What kind and size of prop, and what rpms are you getting with that Homelite 45cc?

Thanks,
AV8TOR

7000 APC 20X8 I really dont like the APC prop it spools up slower than the Zinger I had and I was 7200 with a Zinger.

These numbers are from memory. I cant seem to locate my RPM meter. I put everything away a while ago while I was working on other projects (bought a new tractor) and as we all know when you put things away you may never find it again .

as far as the motor "flooding out" thats probably b/c the plug doesnt get hot enough on its own making it seem like its flooding. I found with the proper plug, fuel and carb settings, there shouldnt be a whole lot of difference in rpm with or without the glow heat on. (maybe a few RPMs)

Have any of you guys got pics or videos of the gas glow engine on a airplane? Also I would love to know what would size of a engine would go with the Hanger 9 Show time?

Here's a few.... 1/4 scale Fokker Triplane with Kioritz 23.6cc, Katana 1.40 with Kioritz 23.6cc, 80" wingspan Tiger Moth with Ryobi 31, and a Giant Big Stik with a Poulan 42cc. All on "Gas/Glow", and all work great!

AV8TOR

Now that is cool[8D]. How does the kantana Fly? I was thinking about putting a Echo 25cc on the Show Time. I believe I can mount it with no problems. I am still working on the giles 202. I just get to busy with other projects.

The Katana flies super and I love it. That Echo/Kioritz 23.6cc engine is all hopped up and turns an APC 16 x 8 prop at over 9000 rpms. I don't do 3D, but the vertical with it is basically unlimited. The Echo engines are a real good choice for the smaller planes, because they are light and powerful. I don't even use a backplate with them. I just put studs in the holes in the back of the engine, and the studs go through the firewall with washers and nuts on back. It's a little tough to get at the nuts on some planes, but usually possible. I did use aluminum angles to mount the Echo on the Katana however, to get it far enough forward without having a long prop adapter. I thought the aluminum angle mounts looked heavy once I had them done, but when I weighed them they were a few ounces lighter than the regular motor mounts that came with the plane!

AV8TOR

Here's a fun pic of that Katana....

AV8TOR

SUCCESS!!!!!!

Switched to a Hangar 9 4s glow plug and it worked WOOHOOO.

I had to fiddle around with the settings some but got it running ok. I am having a small problem getting it to transition smoothly but I hope it can be worked out with the needle settings. It stalls out from an idle to WOT. I always thought that was a to lean issue on the low needle but the leaner I get the better it gets.

Will fart around with it some more tommorow.

Now I need to find a plane light enough I can 3d with 50 ounce motor.

Right now it is on a 15lb plane. I think with the right prop I should be able to do hover the plane. I like to fly slow and low so I want a lot of extra power.

Av8ator;

I got some good data today on RPMS for the 45cc homey.
The only prop I had on hand is an APC WIDE 20X8

RPM results
with battery power on glow plug 7200 using straight glow fuel
With battery power on using 10% nitro 18% oil mixed to 2 parts gas 7000 even.
With no battery on glow plug using 10/18/gas 6500.

I have not got 10% nitro 18% oil mixed to 2 parts gas to work well it has very poor transition without glow power. The oil content must be too high.

I need to find some 10/10 glow fuel. Can any 10 10 glow fuel be used?? I can get some but it is Methy achol or something like that. Did not see methanol listed.

Double post sorry.

as far as methanol goes, read this:
Methyl Hydrate
Is there a difference between Methyl Hydrate, Methanol, and Wood Alcohol?
Answer: There is no difference between these products; it is just a different name for the same thing.

Is there a difference between Denatured Alcohol and Methanol, or are they the same?
Answer: They are not the same, but in most workshop applications either one can be used. Otherwise, Denatured Alcohol is an ethanol-based product and is considered less toxic than Methanol. Check to see if the manufacturer specifies one in particular and follow the recommendation.

Where can I use Methyl Hydrate?
Answer: Methyl Hydrate, also known as Methanol and Wood Alcohol, is used as a fondue fuel, shellac thinner, gas line antifreeze, and, when mixed with water, as a powerful window cleaner.