flyrotary@lancaironline.net Mailing List Archive

Bill,

All inlet ports were blocked with a heat resistant epoxy. The bloke that P ported the rotor housings did it so I cannot tell you what it was other than it was dear. P ported the inlets only as the renesis does calm the exhaust noise a little. Neil.

From: Bill Bradburry

Sent: Thursday, August 23, 2012 1:46 PM

To: Rotary motors in aircraft

Subject: [FlyRotary] Re: Prop revs

Neil,

I am curious about how you blocked the side ports on the Renesis in order to P-port it. Did you P-port both the intake and exhaust? It seems it would be easier to P-port the intake on an older 13B and put Renesis 10:1 ratio rotors in it.

How did you do it??

Bill B

From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Neil Unger
Sent: Wednesday, August 22, 2012 11:21 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Prop revs

ED and all.

Ran up to 6300 revs (approx) and the fuel flow was showing 14.1 GPH at 14 A/F ratio. Not sure that the fuel flow is correct as has not been set yet. This is Tracy’s standard setting so far. Engine is lumpy under 1800 rpm and has its moments until over 3000 rpm when everything acts normally. Suspect that part of the blame may be the slide throttle. Have 6.5 hours on the ground so far and will check for another few hours yet. Full noise gives an EGT of 1770, so will have to up the alarm limit to 1800. Finally fixed all the oil and water leaks. Any advice re what to check next before take off ? Neil.

From: Stephen Izett

Sent: Thursday, August 23, 2012 9:21 AM

To: Rotary motors in aircraft

Subject: [FlyRotary] Re: Prop revs

Hi Ed

Thanks for the offer but I'm not flying yet.

Hopefully early next year.

Steve Izett

Glasair SIIRG Renesis 4 port RD1C EC2 EM3

On 22/08/2012, at 8:51 PM, Ed Anderson wrote:

Steve, if you give me the fuel flow you are seeing at 6300 rpm and manifold pressure, I can give you a pretty good estimate from my spreadsheet of what power you are producing. Also should you happen to have the Air/Fuel ratio that would be a plus but not essential.

From: Stephen Izett

Sent: Tuesday, August 21, 2012 7:23 PM

To: Rotary motors in aircraft

Subject: [FlyRotary] Re: Prop revs

Thanks Ed

I've wondered what my Renesis 4 port with a good intake manifold and in flight adjustable prop will produce.

So on a cold day she will hopefully still breath to 7250RPM and maybe approach 200HP?

Cheers

Steve Izett

On 21/08/2012, at 11:40 PM, Ed Anderson wrote:

Steve,

On a cold morning when I can see 19-20 gph on take off at 6200 rpm, I calculate based on fuel burn rate and an air/fuel ratio of 12.65:1 that I am probably producing around 180-185 HP. On hot days based on fuel burn of 16.5-17.0 GPH, I calculate around 165-170 HP.

The fastest I've ever had the Rv-6A was 200 mph TAS burning round 13.25-14.5 GPH.

But, none of this was done on a dyno - its based on fuel burn and rpm and we all know a rotary can pass through more fuel than is producing power. Anyhow, it’s the best estimate I have.

From: Stephen Izett

Sent: Tuesday, August 21, 2012 10:31 AM

To: Rotary motors in aircraft

Subject: [FlyRotary] Re: Prop revs

Out of interest, what do you think you are getting in HP from your 13B and at what RPM?

Steve Izett

On 21/08/2012, at 9:15 PM, Ed Anderson wrote:

I would say you have winner. Does of course depend on what prop load you were pulling during static run.

I have a fixed pitch 74x88 and a well-tuned older 13B and the best I have ever got static - was 6200 rpm on a cold day. Normally, I get 6000-6100 rpm.

So depending on your prop, it looks like you are doing great for static rpm.

From: Neil Unger

Sent: Monday, August 20, 2012 9:48 PM

To: Rotary motors in aircraft

Subject: [FlyRotary] Prop revs

All,

Looks like I am finally connected after many attempts.. I have a P ported renesis in a glastar that is ready to fly. Tuning the motor yesterday to find that I cannot get the motor revs over 6300. I suspected the prop (prince fixed) is too big, but am assured that that is normal as a static load. Lonnie suggests that once moving the extra revs will appear. How do I tune the motor for the top end revs? Any advice? Neil.

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