DA 50 BREAK IN

[Stainless Skills]

I am breaking in my DA 50 with Lawn Boy at 32:1 and a Vess 22A (22X8).

The engine runs great and I have not touched the factory settings accept for a slight leaning of the low end. The engine used to loose rpm when it was idling and would eventually get to a very low rpm and then shut down but after I leaned it the problem was fixed.

Every time I fly by myself in a idle up mode and do a hard wall the power sags allot and the engine seems like it is about to shut down. I am thinking this could be caused by the inertial force pulling fuel back down into the tank but I did not experience this problem with another DA 50 on the same type of plane.

The problem that has me worried the most is the very inconsistent throttle position at around 1/4 to 1/2 throttle. While I am flying the throttle seems to jump around all over the place. Sometimes it will sag and I think the engine will shut off and sometimes the throttle will spike up real high like I am revving the engine when I am not. This happens when I am in a hover while I am close to the ground and it is unnerving.

These differences in the power of the engine are not huge but they are noticeable. Sometimes I fail to even hear the firing of the mixture for a second or more, it is like the engine is just 8 stroking or something. I know that four stroking is normal in an engine that is not tuned perfectly but it seems as if the ignition is cutting out at certain times.

Could the problem be that the ignition is cutting out?

What would it be like if the ignition is not getting enough juice for short periods of time?

I am using a Fromeco regulator with a 2400 li-ion and a standard receiver jack output with wire that is rated for 3 amps max at around 5.8 volts. Not like the voltage matters.......

I am just thinking of redoing the connector with a deans and seeing if the problem goes away.

Could the ignition timing be off?

The throttle spikes and sags in power so much that I am beginning to think it is not a mixture problem but I could be wrong......

Thanks.

[Vic3D]

Give DA a call before you do anything. They will be sure to help you out.

[flyingklown]

When I first got my DA 50 I had an ignition problem. I bought a new one and it ran great!

[3ddd]

try putting a plate over the atmosphereic plate on the carb and i bet it will help if not fix the problem.when the pressure changes in the cowl it richens up the engine for a moment and that is the sagging you have.i cut a piece of a soda can the same shape but a little bigger and drill the four corner holes in it and bolt in on,it will self form to the plate and shield the atm hole from pressure changes

[Flatlandman]

also before sending it in replace the throttle servo and extensions for the throttle servo.

I had some issues with my throttle and it turned out to be the servo was not working properly when the engine was running. The vibration worked its magic and cause all kinds of problems that disappeared as soon as i replaced the throttle.

[Stainless Skills]

My throttle servo is some 6985 $80 Hitec karbonite gear digital servo that I stole from my brothers car. It is not even hard mounted to the throttle arm so I know my problem is not with the servo.

Has anyone ever experienced a sag in power when they do a wall caused by the inertia of the fuel being pulled back down into the tank? I feel that this is happening to me along with the inconsistent throttle.

I took all 3 outputs on my Fromeco regulator and soldered them onto a Deans connector so now I know I will be getting enough juice going to the ignition.

I will try this out tomorrow and maybe that will fix it.

If not I will get that carbon fiber plane that TBM sells to put over the carb air pressure sensor and then I will try tuning the engine more.

This problem is still really weird though.

[Flatlandman]

kool how do you soft mount a throttle servo, the vibes i spoke of are the ones transmitted to the servo through the body not the arm.

i read in a thread where some one had a graph of their power consumption and the blender and the wall spiked the amps high.

The connector that you changed is it the connector that DA sends with their ignition module. if your still running the boxy connectors that da sends with their ign replace it with any thing else.

[jasonw415]

You shouldn't really need a carb plate because the carb is at the back of the motor. If you're flying a yak this still could be an issue because of the big open cowl. The twins really benefit from the plate because they run carbs that are really exposed to oncoming air flow.

[cyoung450]

I had the same type of thing happening to me, Carb Plate fixed it. I would also not be too quick to judge a motor that is not broke in yet.

CY

[brandonduley]

i had a problem with the idle on my DA-50, rpms would flux. b/w 1900 and 2400 at idle. Sent the engine back to DA, they fixed the problemin two minutes. The Black block b/w the carb and the engine was 180 deg the wrong way. They sent it back idels perfect now.

[yak549618]

I had this on wall and on warter fall but looked and looked finlly switched out the the ignition sent it in they said that it was in the advance. I don't think it's your carb your in back I never used the cover and fly a yak. you may just need to readjust rembmer the low end cotrols the high end in the long run.

[Stainless Skills]

Yah I just got the engine back from DA because they were replacing the cylinder and rings.......

I did chuck the box connectors though and just installed some deans to the regulator off of the ignition.

I am going to go fly in an hour and see if I have to dead stick or not....