OK. Thanks. But what has to be done to set up the ignition system, and does this require the use of another battery? Sorry to sound stupid, but this is new territory for me.

The ignition system requires a battery, 4,8 volt other than that mount the ignition box and plug in the battery and switch, no other set up should be required. read the instructions carfully.

You must a different tank stopper and tubing, sutible for gas. The best differance is the gas carb has a pump in it, so the tank can be mounted on the CG. And a vent line from the tank goes directly to the outside of the fues...no tank pressure line from the muffler.

To fill the tank use a simple T inline to the carb, and a fuel dot.

Thanks for the help, Mark.

Just bought ONE!!! SO I need ONE MORE!!! ANYONE NOT HAPPY WITH THIERS and want to sell it let me know!!!!!!!!!!!
I am looking to put them in my VQ WARBIRDS DEMO AIRCRAFT.....

What size 3-BLADE prop would be good on this engine... I am only guessing a 13x6 prop....I want speed and climb ability....kind of a balance between the two... any suggestions?

How many flights are you guys getting out of the included ignition battery pack on each charge?


Thanks
Tomas Sandoval IV

Smartfly ignition kill, set fail safe to kill engine, I also set carb to close at the same time. Even this small motor could take a head off. IMO

joe

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If it was a straight across conversion, that is, original timing, ports, etc., and all that was changed was the carb and the ignition added, then I would positively say that there was no way that the gas version produces power equal to that of the glow version. It simply could not be done. However, that is not the case in this case. A lot of reengineering has been done by BME. Was there enough wiggle room in the old setup left to compensate for the change in fuels, but recovered by BME's reengineering? I don't know. I haven't ran both of my G90's (one BME, one Chinense glow) as yet. Been too sick this last while to do much. I tend to trust what Keith says, to be honest with you. But figuring out exactly what he said will take a New York Lawyer. <G>

I flew a kit built Sr. Telemaster that was powered by an HB .61 engine. That had way more than enough power to manhandle that model. The gas fired G90 will do at least as well, I'd bet.

Thanks. Let me know when you compare your two 90's as far as power. I assume the glow version's power is derived from its much greater rpm's. I already have a glow ST 90 so I don't know if it's worth the cost to invest in the gasser version for the Tele, which is just a big,fat,slow trainer.

Hope you are feelin's better soon.

Dick Byrnes
Sellersville, PA

Artisan,

In nutshell what does Keith say about the comparative power of the glow ST 90 vs. the BME gas version?

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You are asking me to interpret what Keith said. This is a lose/lose situation for me. <G>

My impression was that they were going to convert a G61 to burn gas/oil mix for fuel, but then thought, "Hey, for nearly the same weight, or less, we can choose the G90 and convert that, realizing a performance increase without the extra weight". In my mind, he was referencing the G61 as the original engine. I would think that his later power estimations and comparisons were based upon comparing the glow G61's power with that of the BME G90. I could very well be wrong.

I can't afford a good New York Lawyer, so someone will just have to run some tests and report the results.

Personally, I would be satisfied as a customer if my BME G90 equalled the performance of the G61 on glow. Anything extra would make me ecstatic. <G>

This kind of reminds me of the reaction of the modeling public to the introduction of .90 sized four-strokes. Some folks just couldn't get that huge (then) displacement out of their minds and were terribly disappointed when they flew their engines for the first time. Everyone had advertised that four-strokes were not equal to two-strokes, but the vision of the .90 displacement persisted and shoved logic and reason out of the way. Lots of four-strokes sold cheaply in the used market for a while because of it. It is all about expectations.

Well, I think you helped me decide. No need to rush. I'm just going to use the ST 90 glow I have; save 380 some bucks for now. I'll wait and see what the consensus is on the BME ST90 after some time goes by. I can always get the gas version later.
Have a good summer, and a lot of flying!

you could try to call BME and ask him

Naahhh, we wouldn't want to do that!!! We have OPINIONS from people, why confuse that with facts??????

<GRIN>

Jim

OK here's a FACT..
G26 gas fuel, Walbro WT499 carb from a glow G23..18-6 prop, 9000 rpm
Same G26, same prop, 9600 rpm glow fuel
I would expect the same result from the 90...
Try some glow fuel in the gas 90, it should run faster....The ignition will work just fine with the glow fuel...Who knows, the gas 90 running glow fuel might run even better than an unconverted 90 glow engine running on glow fuel...
Somebody with a gas 90 want to try it ?
The glow fuel will not hurt the carb, we run engines in our race planes all season on glow fuel in bored out gas carbs...

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I think that basing one's judgement to buy this engine based upon fuel savings (you did not mention this that I recall) is outright foolish. Yeah, I like the idea of a no clean-up model, but realistically, there has to be a novelty element to it in order to justify the expense of the engine. That novelty element was enough for me to buy. In years past, when money had to be targeted to accomplish a specific hobby task, this would not have happened/been true.

The mere fact that it is what it is, provides me with enough satisfaction. I have owned other BME products (44 & 50cc c.i.d. engines), so I know that Keith will keep me flying, should I need expert support.

On the other hand, there's nothing like being one of the first to own a new piece of technology. [8D]

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And you could change your name to something civilized.[:'(]

I do agree that calling BME would hold the most potential for answering his questions.

OK fellas... Just got my BME SuperTigre 90 Gas conversion Engine in the mail today... Pretty cool motor!!
No instructions though... I got it 2nd hand from a fella who wanted to buy a more 3-D capable motor... I am going to use it in Warbirds so I am cool... anyone have a spare set of instructions who can email me a scanned copy? Perhaps... or even mail it to me?

I am still also interested in obtaining a 2nd BME ST 90 Gas conversion Used.... Let me know by Private message if you have one that you want to sell... I need the 2nd one so I can mount them in my P-38!!
Thanks
Tomas

Which P-38 are you going to put them in?

Birddog-RCU ,
I am actually going to put them into the VQ WARBIRDS P-38 Lightning... (it will be my demo P-38 for my VQ Warbird line)
http://www.vqwarbirds.com/products/aircraft/p38.html
I am thinking it will really turn heads...People will think it has glow engines on it... and then .... Pow! Gas!![>:]

ANYONE else have a ST 90 CONVERSION on a sport plane or 3D plane and are unhappy with the performance and perhaps they wanna unload to a WarBird guy...? let me know...I am shopping

Very cool... that will be a lot of power for that bird. I saw a bunch of those fly this year and last year at the West Coast Rally of the Giants IMAA meet and they are fast with smaller 4 strokes. I think you better consult with NASA on your planned configuration.

Alan,, It would have been good to talk to you at the rally of the giants, but I guess we never crossed paths. I saw a few others there from RCU and had a good BS with RCIGN1.

Sorry I missed you as well. We'll be back for more California fun.

OK ....since I am the newbie at Gas Conversion engines I am throwing out a question a friend asked...

Here is the statement or query:
ANY COMMENTS or statements on that query or statement made by a friend of mine? Appreciate the USEFUL comments and opinions are also welcomed!
Thanks in advance, Tomas

If you start at the front and read the whole thread you will see that the rod has been converted with a roller bearing, there will be no problem running with normal gasser fuel....
Even if the rod was stock there would be no problem if the proper amount of oil (same as the glow fuel) was mixed in the fuel...

Keith:

There are people in the hobby that can not get a engine right regardless of how hard they try!!!!!!!!!!! Anyone who uses a masterairscrew for anything other than a trainer or paint stick must be suspect. Regardless, anyone who builds a bueatiful twin 60 and then sells them all out before I could buy one should be shot at sunrise!! Do I hold a grudge long time or what? Rever bro 119

Hi.

.Somebody can tell me about the New BME G90 Engine gas convertion.The BME say that the G90ci deliver 2.7 HP.......anyway.....give me a help with the information