glow engine mounting question.
11-04-2010 | 01:48 PM
#26
RE: glow engine mounting question.
Man, I like your reasoning regarding glow motors. I have a powerful leccy as well but I still prefer glow.
Just watch out when you want to start the engine with an electric starter. If fuel leaked into the inverted motor you are going to get hydraulic lock. Should you use the starter you might bend something, normally the conrod. Always first flip the prop over by hand (of course without connecting the glow plug), if it turns over then only connect the glow plug and use the starter.
Should the prop lock, it means you have fuel in the inverted cylinder. Remove the glow plug and let the fuel drain out. Replace the glow plug, tighten it and try again.
Just watch out when you want to start the engine with an electric starter. If fuel leaked into the inverted motor you are going to get hydraulic lock. Should you use the starter you might bend something, normally the conrod. Always first flip the prop over by hand (of course without connecting the glow plug), if it turns over then only connect the glow plug and use the starter.
Should the prop lock, it means you have fuel in the inverted cylinder. Remove the glow plug and let the fuel drain out. Replace the glow plug, tighten it and try again.
11-04-2010 | 05:22 PM
#27
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From: Poolesville, MD
RE: glow engine mounting question.
ORIGINAL: safeTwire
I stand firm on my comments due to experience.
Manufacturer's suggest an installation for many reasons. Mainly for best results and secondly, for unnecessary returns.
I stand firm on my comments due to experience.
Manufacturer's suggest an installation for many reasons. Mainly for best results and secondly, for unnecessary returns.
Manufactures suggest tank height adjustments to prevent siphoning and flooding, which is mainly an issue that occurs PRIOR to starting the engine.
Once the engine is running tank height is not as highly problematic as is being implied.
As I said, our engines would merely die out during a decent or climb if it were!
Our planes see as much as a 9" tank height difference when they go nose up, yet your engine still runs fine once adjusted.
In spite of this people are agnonizing over a less than 1" difference when the plane sits level.
Pumps are great, but more often than not unneeded ( yes there are various exceptions ) if the engine is properly tuned and configured.
11-04-2010 | 05:27 PM
#28
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From: Poolesville, MD
RE: glow engine mounting question.
ORIGINAL: JohnBuckner
In your first post you said this whole discussion was over getting the the engine entirely within the cowling, well this is not going to happen even with a 25 size engine much less the hot .40FX.
Doing what you suggested involves going full inverted and raising the thrust line vertically withing the cowl and even that is debatable. This is going add additional aerodynamic changes in the airplane and that is a terrible idea. You have not even considered the cutouts for the muffler. Finding a pitts or box muffler that will fit and be completely within without drastically changing the thrust line is not going to happen either.
If you use a stock muffler a simple tunnel can be added as in the pictures of one of mine agine not the same airplane but one with almost identical dimension and cowl shape.
John
In your first post you said this whole discussion was over getting the the engine entirely within the cowling, well this is not going to happen even with a 25 size engine much less the hot .40FX.
Doing what you suggested involves going full inverted and raising the thrust line vertically withing the cowl and even that is debatable. This is going add additional aerodynamic changes in the airplane and that is a terrible idea. You have not even considered the cutouts for the muffler. Finding a pitts or box muffler that will fit and be completely within without drastically changing the thrust line is not going to happen either.
If you use a stock muffler a simple tunnel can be added as in the pictures of one of mine agine not the same airplane but one with almost identical dimension and cowl shape.
John
The plane flies fine with a .40FX side or angle mounted, as long as the batteries are placed further back.
11-04-2010 | 06:17 PM
#29
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From: Bend,
OR
RE: glow engine mounting question.
ORIGINAL: DustBen
Why convert from electrics to glow? There're 22 gabillion of us wishing we didn't have wadss of cash tied up in glow so we could easily afford switching to electrics!
ORIGINAL: JDSanders
Thanks. I have had a few electrics that I have put together but this is my first glow engine. I figured it would be fine but just wanted to make sure before I did anything.
Thanks. I have had a few electrics that I have put together but this is my first glow engine. I figured it would be fine but just wanted to make sure before I did anything.
11-05-2010 | 05:26 PM
#30
My Feedback: (1)
RE: glow engine mounting question.
JDSanders, no, no, NO! In my opinion, you do not need your first glow engine to be mounted inverted. But first, let me thank Jan Karlsson, and a few others, for inserting some sanity into this thread.
If you are new to glow and/or new to flying, please do not shoot yourself in the foot by making an unwise choice.
Tuning a glow engine correctly and precisely takes experience and time to develop a feel for how to run it and an "ear" for the sound. If your idle is not correct with an inverted engine, it will make your takeoffs and landings probably. When you add power for take off, your engine may sputter and quit. When you land, your engine may quit at idle so you only get one touchdown instead of a dozen.
When you are learning, you want to minimize every possible problem so you can fly and learn. Why come down final approach and have to worry if the engine is going to quit? Set yourself up for success. Get a trainer and fly the heck out of it. Then graduate to a Stick or a low wing sport plane like a 4-Star or something similar. I prefer the Stick, myself, but either is fine.
Finally, you can pull out your plane with the inverted engine and go for it.
If you are new to glow and/or new to flying, please do not shoot yourself in the foot by making an unwise choice.
Tuning a glow engine correctly and precisely takes experience and time to develop a feel for how to run it and an "ear" for the sound. If your idle is not correct with an inverted engine, it will make your takeoffs and landings probably. When you add power for take off, your engine may sputter and quit. When you land, your engine may quit at idle so you only get one touchdown instead of a dozen.
When you are learning, you want to minimize every possible problem so you can fly and learn. Why come down final approach and have to worry if the engine is going to quit? Set yourself up for success. Get a trainer and fly the heck out of it. Then graduate to a Stick or a low wing sport plane like a 4-Star or something similar. I prefer the Stick, myself, but either is fine.
Finally, you can pull out your plane with the inverted engine and go for it.
11-05-2010 | 06:04 PM
#31
RE: glow engine mounting question.
I'd suggest you to mount the engine on a test stand , start her & tune it,
prior to installing her on your firewall,
ofcourse UPSIDE-DOWN...
You won't get any trouble at all...
I have also x2 4strokes ,
SAITO FA-120S
& FA-150S
both installed upside-down....they run awesome!
-
-
[youtube]http://www.youtube.com/watch?v=ejTNK5kiaGQ&feature=mfu_in_order&list=UL[/youtube]
-
[youtube]http://www.youtube.com/watch?v=6xjQlowDuIc[/youtube]
prior to installing her on your firewall,
ofcourse UPSIDE-DOWN...
You won't get any trouble at all...
I have also x2 4strokes ,
SAITO FA-120S
& FA-150S
both installed upside-down....they run awesome!
-
-
[youtube]http://www.youtube.com/watch?v=ejTNK5kiaGQ&feature=mfu_in_order&list=UL[/youtube]
-
[youtube]http://www.youtube.com/watch?v=6xjQlowDuIc[/youtube]
