RC Guys Super Decathlon coming
10-28-2008, 08:24 AM
#751
RE: RC Guys Super Decathlon coming
Bob and Charley,
The G38 in my friend Bob's Super Decathlon IS a Magneto engine from B&B Specialties. As far as I know there were no real issues bolting it on. The only thing I didn't like was the fact that he had to add about 12 oz. to the tail to make it balance. But...even so...the plane is incredibly light for it's size and has power to spare. I'm so impressed with how his turned out that I'm doing the exact setup on my new RC Guys SD but I'm adding smoke system. An EI on a G38 will prevent, possibly, adding the weight in the back, but my point is that the plane was built so light it doesn't even matter. Slap an 18 x 8 prop on there and go do some pretty looking loops and rolls just like the real plane. Have fun!
FYI...if you would like some photos of my friends plane...let me know. The really cool thing is...everything is enclosed except the ram injector for the carb. Really looks scale!
The G38 in my friend Bob's Super Decathlon IS a Magneto engine from B&B Specialties. As far as I know there were no real issues bolting it on. The only thing I didn't like was the fact that he had to add about 12 oz. to the tail to make it balance. But...even so...the plane is incredibly light for it's size and has power to spare. I'm so impressed with how his turned out that I'm doing the exact setup on my new RC Guys SD but I'm adding smoke system. An EI on a G38 will prevent, possibly, adding the weight in the back, but my point is that the plane was built so light it doesn't even matter. Slap an 18 x 8 prop on there and go do some pretty looking loops and rolls just like the real plane. Have fun!
FYI...if you would like some photos of my friends plane...let me know. The really cool thing is...everything is enclosed except the ram injector for the carb. Really looks scale!
10-28-2008, 08:37 AM
#752
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RE: RC Guys Super Decathlon coming
Hope you didn't interpret my reply as a negative comment about the G-38...just an advisory about overall weight and balance.
And yes - I'm sure this will be "scale", with a little oomph the real one didn't have... can't wait.
And yes - I'm sure this will be "scale", with a little oomph the real one didn't have... can't wait.
10-28-2008, 08:52 AM
#753
RE: RC Guys Super Decathlon coming
No...point well taken. As you say, it will still have oomph the real one didn't have, and that itself is a plus. In my humble opinion...after watching it fly many times...I think it's the perfect 'scale' engine for this plane. 
10-28-2008, 09:01 AM
#754
RE: RC Guys Super Decathlon coming
ORIGINAL: outacontrol41
Bob and Charley,
The G38 in my friend Bob's Super Decathlon IS a Magneto engine from B&B Specialties. As far as I know there were no real issues bolting it on. The only thing I didn't like was the fact that he had to add about 12 oz. to the tail to make it balance. But...even so...the plane is incredibly light for it's size and has power to spare. I'm so impressed with how his turned out that I'm doing the exact setup on my new RC Guys SD but I'm adding smoke system. An EI on a G38 will prevent, possibly, adding the weight in the back, but my point is that the plane was built so light it doesn't even matter. Slap an 18 x 8 prop on there and go do some pretty looking loops and rolls just like the real plane. Have fun!
FYI...if you would like some photos of my friends plane...let me know. The really cool thing is...everything is enclosed except the ram injector for the carb. Really looks scale!
Bob and Charley,
The G38 in my friend Bob's Super Decathlon IS a Magneto engine from B&B Specialties. As far as I know there were no real issues bolting it on. The only thing I didn't like was the fact that he had to add about 12 oz. to the tail to make it balance. But...even so...the plane is incredibly light for it's size and has power to spare. I'm so impressed with how his turned out that I'm doing the exact setup on my new RC Guys SD but I'm adding smoke system. An EI on a G38 will prevent, possibly, adding the weight in the back, but my point is that the plane was built so light it doesn't even matter. Slap an 18 x 8 prop on there and go do some pretty looking loops and rolls just like the real plane. Have fun!
FYI...if you would like some photos of my friends plane...let me know. The really cool thing is...everything is enclosed except the ram injector for the carb. Really looks scale!
10-28-2008, 02:18 PM
#756
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RE: RC Guys Super Decathlon coming
ORIGINAL: outacontrol41
Bob and Charley,
The G38 in my friend Bob's Super Decathlon IS a Magneto engine from B&B Specialties.
Bob and Charley,
The G38 in my friend Bob's Super Decathlon IS a Magneto engine from B&B Specialties.
Bob, what's your 50's AUW w/ battery?
CR
10-28-2008, 02:47 PM
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RE: RC Guys Super Decathlon coming
ORIGINAL: Bob Pastorello
Wish I knew the answer. I wanted to get this going, so got in a rush and skipped the scale. Sorry.
Wish I knew the answer. I wanted to get this going, so got in a rush and skipped the scale. Sorry.
Does the 50 fit inside the SD cowl? It looks pretty wide. No dimensions on the web site.
CR
10-28-2008, 03:22 PM
#759
RE: RC Guys Super Decathlon coming
[/quote]
Of course we want to see the pics. The latest issue of MA shows how to change the woodruff key on a G38. He says the flywheel is not that hard to pull off, incase you did want to convert to electronic. [/quote]
Been there done that. It's not hard to do, but you need a flywheel puller. I redneckishly pulled mine off with a couple of large screw drivers at opposite sides. But,
I got the job done. Engine ran like new again. I'm told G38 are easy to shear the woodruff key,,,so be careful of prop strikes![:-]I'll have some pics later.
10-28-2008, 05:48 PM
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RE: RC Guys Super Decathlon coming
ORIGINAL: Bob Pastorello
Do you mean that a "flywheel puller" is *** NOT *** two screwdrivers?????
Holy crap.... all these years.....
Do you mean that a "flywheel puller" is *** NOT *** two screwdrivers?????
Holy crap.... all these years.....
CR
10-28-2008, 06:27 PM
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RE: RC Guys Super Decathlon coming
nothing great, but here's a couple. taken w/ cell phone cam at engine run in. don't know what weird artifact is.
Charley - yes, the engine fits completely within the cowl. except for the tip of the exhaust tube, and couple slight "relief" openings (corner of muffler, plug cap end). Removed the plastic induction venturi boost thingy.... don't believe in them, anyway.
Charley - yes, the engine fits completely within the cowl. except for the tip of the exhaust tube, and couple slight "relief" openings (corner of muffler, plug cap end). Removed the plastic induction venturi boost thingy.... don't believe in them, anyway.
10-28-2008, 08:33 PM
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RE: RC Guys Super Decathlon coming
ORIGINAL: Bob Pastorello
Charley - yes, the engine fits completely within the cowl. except for the tip of the exhaust tube, and couple slight "relief" openings (corner of muffler, plug cap end). Removed the plastic induction venturi boost thingy.... don't believe in them, anyway.
Charley - yes, the engine fits completely within the cowl. except for the tip of the exhaust tube, and couple slight "relief" openings (corner of muffler, plug cap end). Removed the plastic induction venturi boost thingy.... don't believe in them, anyway.
] Good luck on the maiden.CR
10-29-2008, 12:23 AM
#764
RE: RC Guys Super Decathlon coming
ORIGINAL: Bob Pastorello
nothing great, but here's a couple. taken w/ cell phone cam at engine run in. don't know what weird artifact is.
Charley - yes, the engine fits completely within the cowl. except for the tip of the exhaust tube, and couple slight "relief" openings (corner of muffler, plug cap end). Removed the plastic induction venturi boost thingy.... don't believe in them, anyway.
nothing great, but here's a couple. taken w/ cell phone cam at engine run in. don't know what weird artifact is.
Charley - yes, the engine fits completely within the cowl. except for the tip of the exhaust tube, and couple slight "relief" openings (corner of muffler, plug cap end). Removed the plastic induction venturi boost thingy.... don't believe in them, anyway.
10-29-2008, 12:35 AM
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RE: RC Guys Super Decathlon coming
Hello All.. I am in need of a right wing and a door... Any one have one from a wrecked one? My wing departed my truck on the way home from the field and was run over - and my door left the airframe while in flight on the same day mind you. It has not been seen since[&o]
. It has not been seen since[&o]
10-29-2008, 08:29 AM
#766
RE: RC Guys Super Decathlon coming
The only way to solve this issue is to Call RC Guys and ask for help. You'll be forever waiting for one of us to wreck a plane and sell you the parts. Give RC Guys a customer support test. Good luck and I hope they can help.
10-30-2008, 08:13 AM
#768
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RE: RC Guys Super Decathlon coming
ORIGINAL: outacontrol41
Bob...the plastic induction venturi boost thingy helps the carb breathe but ony if drawing air from outside the cowl and with an angle to catch to propwash air. It improves performance on gas engines. The plastic ones are crap. The best ones are metal with angled end. All my engines have them. Easy way to add RPM's.
Bob...the plastic induction venturi boost thingy helps the carb breathe but ony if drawing air from outside the cowl and with an angle to catch to propwash air. It improves performance on gas engines. The plastic ones are crap. The best ones are metal with angled end. All my engines have them. Easy way to add RPM's.
So how do you handle this in a cowled installation?
CR
10-31-2008, 08:43 AM
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RE: RC Guys Super Decathlon coming
IMHO, this engine might have problems with overheating.
Big air inlets with very small outlet means that air is going to pool inside and greatly reduce the hot air expelled.
Big air inlets with very small outlet means that air is going to pool inside and greatly reduce the hot air expelled.
10-31-2008, 09:23 AM
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RE: RC Guys Super Decathlon coming
Hey Bob
Yah.. as I look at the pics I can see your point here.
I'm still working on getting enough air to my Saito 180 inverted.
Ground back a little more of the lower cowl the other day, added some fiberglass duct to the "nostrils" to deflect flow down (w/o restricting too much) to the cylinder.
Think I may be about done. I hated to remove material past that nice double bend "scoop" near the rear, but I bit the bullet and put a nice "smiley face" on it. Pretty much took out the center of the lower cowl about 2" forward and 6" wide. When she passes it looks like she's smiling.
Also dremeled out a ~1.25" hole right under the prop hole where that little divot is... on the 180-invert that's right in line with the front of the cylinder.
Scott
Yah.. as I look at the pics I can see your point here.
I'm still working on getting enough air to my Saito 180 inverted.
Ground back a little more of the lower cowl the other day, added some fiberglass duct to the "nostrils" to deflect flow down (w/o restricting too much) to the cylinder.
Think I may be about done. I hated to remove material past that nice double bend "scoop" near the rear, but I bit the bullet and put a nice "smiley face" on it. Pretty much took out the center of the lower cowl about 2" forward and 6" wide. When she passes it looks like she's smiling.
Also dremeled out a ~1.25" hole right under the prop hole where that little divot is... on the 180-invert that's right in line with the front of the cylinder.
Scott
10-31-2008, 09:56 AM
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RE: RC Guys Super Decathlon coming
ORIGINAL: mschneider2005
I mounted my Saito 1.80 sideways and haven't had one second of problems with it. Just the tips of the valve covers sitck out a little. I used the stock muffler with a sillicone extension tube.
I mounted my Saito 1.80 sideways and haven't had one second of problems with it. Just the tips of the valve covers sitck out a little. I used the stock muffler with a sillicone extension tube.
1:2 or 1:3 ensures good airflow through the cowl. Adding baffling to direct air over the cylinder fins and then straight out (to further reduce pooling) is even better.
If yours isn't overheating it is because you've got good airflow. I can't see the outlet in the photo, but the inlets on your cowl look a lot more restricted than those of the G38, which is good.
The reason I said the G38 MIGHT overheat is because it's hard to say what is actually going on inside the cowl during flight. It might be that some of the airflow sets up some kind of "blocking" pressure areas that permit a good airflow over the cylinder head, in defiance of conventional wisdom. But if the engine DOES overheat, the first suspect would have to be the inlet/outlet ratio.