3W 106 no plenty of power

[freeflyer]

Hello all,

I have a stock 3w106 runing on supersonic mufflers.
When i had broken in (one year ago) it was full of power but i don't known it max rpm(i think more than 6000) , the 28*10 prop scream when the model goes up.

But one day i avoid my landing, the landing gear decided to leave the plane and my mufflers where broken, i'v reweld it.
But since this hard landing my engine runs slowly, i'v mesured it at 5300 trm with a 28*10 wood PAKR prop, i think it's weak for this engine
I never touch the hight and low screws since i've broken the engine but after the 5300 rpm mesuring i tried to lean or to rich it and my original breakin setting was the best.

This not very dramatic because my engine runs very well, easy to start, i have total trust in this engine when i hover.
I only want to have this extra power because a lot of power isn't enought , i need too much

Sorry for my english i live in europ.

Thank's

[RustyTumbles]

Did you prop hit the ground during the bad landing? If so you may have caused some internal damage to the engine.

[Jamieman]

You said the mufflers were damaged & you welded them.
If the damage has caused restriction within the muffler, this will cause loss of power. May also cause increased eng temp too.

[freeflyer]

Yes the prop hit the ground but i don't understand how this can reduce power : the engine runs or it break down or make anormal noise?
Yes this induce a restriction in the mufflers, this possible but the mtw or krumsheid cans have small outlets, but it's not the same exhaust system...
Their is a big gold screw on the carb with red glue arround, i want to know if it's a good idea to try a setting with this or not...

[3ddd]

maybe when the prop hit it broke the keyway stock that locks the hub from turning.sound like maybe the hub has turned and the timing is off just a little.this will cause a loose in rpm and power without showing any sins of damage.at the top dead center marks the magnet should be about 50 % under the hall senser be eye sighting it

[DKjens]

I second 3ddd, I think the keyway has broken and the hub has turned slightly. The keyway in my 3W140TOC broke just from running with a loose prop. After that the engine ran like only one cylinder fired, but it was actually running on both. I checked the timing and sure enough, it was way off. If it's only off by a few degrees, you would experience exactly what you are, a slight to significant loss in power.

[freeflyer]

Thank's for your posts,
I'm sorry but i don't understand the technical words (keyway or hub or top dead center)
But i think to understand : when the prop hit the ground the magnets made a few degree revolution so they aren't at the good place???
So where is this keyway, what does it look like and how can i remove or change it?

Thank's

[DesertHucker]

	Quote: Originally Posted by freeflyer
	Thank's for your posts, I'm sorry but i don't understand the technical words (keyway or hub or top dead center) But i think to understand : when the prop hit the ground the magnets made a few degree revolution so they aren't at the good place??? So where is this keyway, what does it look like and how can i remove or change it? Thank's

In the hub and the crank is a groove (slot, key-way,cut out) that matches one in the hub.
Then there is a metal, steel half circle (half moon) that fits in the slot, cut out, key-way. This metal thing holds the crank and hub in the corect location.

The other thing to consider, if your prop hit the ground and broke the key-way it would have twisted the crank webbing as well.

The only way to find this is to remove the crank from the engine.

Would be a good idea to send it to your 3W service centre get it checked.

Muffler restriction could be a problem. take them of and start it, see if it revs ok will not harm your engine for a short time.

[freeflyer]

yes i understand but a was seraching for some schemes on the web, i don't find anything..
is that the boken part (key) http://www.3w-modellmotoren.com/engl...ellmotoren.htm

or this (Crank pin) http://www.3w-modellmotoren.com/engl...ellmotoren.htm

[bodywerks]

Freeflyer, your English translation is simply awesome! You have a way with "our" words, lol!
Seriously, have you considered just sending the engine in? I'd bet they would find what's wrong...

[DesertHucker]

	Quote: Originally Posted by freeflyer
	yes i understand but a was seraching for some schemes on the web, i don't find anything.. is that the boken part (key) http://www.3w-modellmotoren.com/engl...ellmotoren.htm or this (Crank pin) http://www.3w-modellmotoren.com/engl...ellmotoren.htm

Your links go to the home page
http://www.3w-modellmotoren.com/prei...tnehmer_en.php
the key is what could have broken.
But seriously it should go in for repair and check the crank webbing as well.
Takes a lot to brake these keys.
I twisted a crank without braking the key.

Loza

[hawk21]

Sending the engine for a check, is the best way to know what is wrong