flyrotary@lancaironline.net Mailing List Archive

Bill,

Being an electric prop, you have to give it time to readjust pitch once you change the rpm setting. Once engine speed has stabilized from the higher setting, you then lock the prop by going to the "manual" setting. Your engine rpm should go way up when you go from cruise setting to the higher "takeoff" setting. I set my prop to 2100 rpm for takeoff, so I don't understand how that could be too coarse a pitch setting. If you set your prop to a higher setting for takeoff, you may need to pick a higher number. (I think Bobby Hughes sets his to 2400 for takeoff.) I hit around 7200 rpm (engine) on takeoff with my prop set to 2100 rpm, so I don't set it any higher than that. If you're floating down the runway, you're obviously set too coarse. I suggest trying a higher rpm (finer pitch) at 100 rpm increments until you find the rpm that works for your airplane. It should be close to your takeoff setting.

Mark

On Thu, Nov 14, 2013 at 3:45 PM, Bill Bradburry <bbradburry@bellsouth.net> wrote:

Mark,

I tried setting the prop for a more coarse setting prior to landing like you describe. I probably come in too fast, but with the prop set like that, I floated in ground effect almost the length of the runway, then when I added power to go around, I didn’t have much climb power. I tried it a few times and it was similar each time. I could probably learn to land that way, but I gave it up and went back to the brake effect you get with a flat prop when you cut the power.

I will try the learning method you describe to see if that fixes the surge problem.

You haven’t reported on how your plane is doing with the new panel???

B2

From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Mark Steitle
Sent: Thursday, November 14, 2013 2:35 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Rotary Digest Activity

Bill,

I also have an M/T electric prop. I discovered a long time ago that my landings are more predictable if I switch the prop over to manual mode prior to entering the pattern. I typically level off about 3-5 miles out, change the prop rpm to 2100, wait for it to re-adjust itself, then switch to manual mode. This makes the prop behave like a fixed-pitch, and from this point to touchdown I fly it like a fixed-pitch prop.

Regarding your surging issue, Tracy suggested to me to simulate a landing, but at a safe altitude. Set up as if you were in the pattern preparing to land, and then put the EM-2 into auto-tune mode. Let the EM-2 tune the settings which are impossible to tune on the ground. Worked for me.

Thanks,
Mark
On Thu, Nov 14, 2013 at 12:06 PM, Bill Bradburry <bbradburry@bellsouth.net> wrote:
Jack,

I think everybody is waiting for an opportunity to help someone with a problem. So I am always ready with one that I can use a little assist on.

I am having an engine surge and wildly fluctuating mixture when I get into the pattern and reduce the manifold pressure to around 15 inches and below. I have an MT electric constant speed prop, so my engine rpm at this time is pretty high, usually around 6K. This is an area that can not be tuned on the ground and I suspect that is the problem, however, the MAP table is at the factory setting of zero in areas that I have not tuned. It can get pretty exciting when it starts so I would like to get it ironed out.

Others having similar problems or how to go about the fix?

Bill B

From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of marv@lancair.net
Sent: Thursday, November 14, 2013 12:08 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Rotary Digest Activity

HI Jack,

I checked and found your subscription to be intact. It appears that there has been no Flyrotary traffic since 11/3. Very strange, indeed... but it happens I guess. Could be everybody's buttoning down for the winter... we'll see.

<marv>

"Jack Hilditch" <wmjack@t3cs.net>:

> Good morning,
>
>
>
> I watch for the digest every morning but the last one that arrived is
>flyrotary
> Digest #3834 dated 11/04/2013. Have I been unsubscribed for some unknown
>reason
> or has the list simply gone quiet?
>
>
>
> Thanks very much,
>
>
>
> Jack
>
>
>
> Jack Hilditch, MCP
>
> T3CS Systems Support
>
> 205 Storrs Road
>
> Mansfield Center, CT 06250
>
> Cell 860-729-6948
>
> <mailto:wmjack@t3cs.net> wmjack@t3cs.net
>
>
>
>
>
>
>
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