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HomeRC & Power✈️Aircraft🚁HelicopterEngines Plugs Mufflers Fuel › Same engine/muffler, different output power
08-02-2007 08:27 PM  13 years ago
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n808

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Same engine/muffler, different output power
A friend's Hyper 50 seems to output much more power than mine, and I am investigating the differences.

Does anyone happen to know how large a percentage of the engine's output power the fan takes up? Of course, it would only be a rough estimate, but is it in the 1% or 10% range?

How about belt drive vs torque tube? Would that be a noticeable difference?

They were bought at almost the same time, broken in about the same manner, roughly same # of gallons (~3), MP5, Trex 600N Sport vs Pro.

Differences:
Lower power / Higher power
3Dx fan / Stock plastic fan
Belt drive / Torque tube
RCP blades / V blades
I have been running other blades too, but not too much difference, I think. My belt is on the loose side.

Maybe I need to try and lean my engine just a little more, but I have not wanted to go above 200F on the side / 120F bottom plate after a flight.
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08-02-2007 10:34 PM  13 years ago
3Dx

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Haw many turns do you have on the needle??

Pilots have report hi power do to the possibility of leaning the engine.}

3Dx Fan here in this video...

http://www.youtube.com/watch?v=fm3QOLITPPE
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08-02-2007 10:47 PM  13 years ago
Jason Bell

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California

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What governors are you using? and is the headspeed the same?

Also it can be the pilot to, some just make things look more powerful.

I can tell you with the 3Dx fan, I was able to lean my motor MORE, and it has more power. So the fan is not of an issue.

Also take into count wieght of the helis.
AMain.com
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08-02-2007 11:12 PM  13 years ago
n808

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Thanks for the advice.

Same governor (MultiGov), same headspeed, similar electronics/weight, similar needle settings (1 turn + 2-3 clicks), about the same flight time on a full tank. Mine bogs down a lot more in a simple full power climbout, and climbs slower, with about the same max pitch. I will verify max pitch next time.

I doubt it's the fan too, just trying to figure out the source of the difference. My governor sensor is working during idle, but I will check that it's working in flight as well.

I took my engine out and see no apparent wear or damage to the cylinder or ring.
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08-02-2007 11:19 PM  13 years ago
Jason Bell

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If yours is bogging, it sounds like its not fully up on the pipe, or your pitch range is off.

Lets see what you find out, it will be interesting to hear for sure!

Maybe its just the blades?
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08-02-2007 11:48 PM  13 years ago
3Dx

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(1 turn + 2-3 clicks),
Try this: 1 turn "-" 2-3 clicks
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08-02-2007 11:58 PM  13 years ago
Jason Bell

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Sounds like up to 220 on the head sounds safe

Temps Here
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08-03-2007 12:12 AM  13 years ago
n808

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Thanks, it was pretty warm the other night. Maybe I was too worried about measuring the temperature instead of flying and listening to the engine I will lean out a little more next time.
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08-06-2007 10:05 PM  13 years ago
n808

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By leaning a few clicks to about 2 clicks below 1 turn :S, and still running at 210F when landing right after a series of high load moves, performance is quite a bit better. I have 2070 headspeed in idle up 2, sky tach said 2000 (odd that MultiGov is off by that much, or perhaps the sky tach was off).

I will borrow some expert ears to verify the tuning at the next fun fly. Also on the todo list is to experiment with the limiter mode (as opposed to full governor mode) and some advanced parameters on the MultiGov.

One reason my friend's heli seemed to have more power, and sounded thus, was that the plastic fan had flexed and fried the sensor. As a result. he was running a non-governed 100-60-100 throttle curve with hovering head speed at 2400.
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08-06-2007 10:07 PM  13 years ago
Jason Bell

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LOL!!!

Yea theres your problem!!

With the limiter mode set I am running base gain at 65, and overspeed agress at 25. Set to 2100 rpm, and I tached it, it was right on.
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08-07-2007 03:39 AM  13 years ago
n808

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torkboy: what does your throttle curve look like in limiter mode?
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08-07-2007 03:42 AM  13 years ago
Jason Bell

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100-80-100. As per instructions.AMain.com
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Xnova Motors
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08-07-2007 03:50 AM  13 years ago
n808

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That's pretty aggressive settings, with the BaseGain and OvSpdAgres. But as long as you don't get any oscillations/hunting or too much overspeeding. I will try it it. Thanks.
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08-07-2007 03:59 AM  13 years ago
Jason Bell

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That is now what all the multigovs are shipping with.

Me and a local pilot(Brandon Updike) tried out the settings before Bob changed the defaults.
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08-07-2007 04:03 AM  13 years ago
n808

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OK. Mine were set more conservatively. Good to know.
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08-07-2007 04:06 AM  13 years ago
Jason Bell

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Actually with the base gain at 50, and overspeed agress at 20(old defaults) it was a little more overspeedy than it was now. Current settings are much better!AMain.com
Mikado "V Team"
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08-07-2007 04:08 AM  13 years ago
n808

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Thanks again for very helpful information! Those were the settings mine came with, but I will modify with your suggested changes.
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08-07-2007 04:09 AM  13 years ago
3Dx

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Monterrey NL

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Well Guy´s, i am happy the 3DX Fan was not the problem.....
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08-07-2007 04:13 AM  13 years ago
n808

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3Dx, yes in this case, the plastic fan had not thrown my buddy's magnets, but warped enough to touch the sensor and fry it.

When I took out my engine, there were a couple of tiny stripes on my 3Dx fan as well, from touching the sensor, but no damage. I knew I had mounted the engine too high, since the clutch bell was making noises while idling. Now when I re-installed it, I let it sit lower while tightening the screws. No noise, and no fan getting close to sensor problem. Great fan!
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08-07-2007 04:18 AM  13 years ago
Jason Bell

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California

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Great fan!
I cant agree more, and glad we got your problem fixed!
AMain.com
Mikado "V Team"
Xnova Motors
Optipower USA
RCProPlus
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