From: "Neil Unger" <flyrotary@lancaironline.net>
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To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
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Subject: Re: [FlyRotary] Re: which oil for the fuel
Date: Tue, 30 Dec 2014 18:39:27 +1100
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Steve, Can't really claim any credit as got RWS to make the rads, dear but 
certainly work.  The inlet is only now 120 sq inches max with Paul Lamars 
plenum.  Will have to measure it to get exact figures.  Started with 
something like 160 square inches, and could not get it warm.  Ended cutting 
down the inlet and still cool so finished putting in a thermostat. That 
fixed all troubles with too cool.   RWS Rads are 555 x 259 x 55mm which is 
about 500 Cub Inches.  Oil is 50% of water,  470 x 155 x 55mm.  That is for 
a P port renesis or 13B.  Outlet on mine is huge, same size as the rads. 
Will try and experiment on the test bed, but is supposed to be 3 times the 
inlet. I really have no idea.  Neil.

-----Original Message----- 
From: Stephen Izett
Sent: Tuesday, December 30, 2014 9:11 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: which oil for the fuel

Sorry Neil, Forgot yours was the Glastar.
Great news on the mixture control.
So what have you learnt / come to re the cooling formula. Intake area, Rad 
area, exit area?

Steve


> On 30 Dec 2014, at 5:03 am, Neil Unger <flyrotary@lancaironline.net> 
> wrote:
>
> Steve,   how cutting can you get, an RV????    (Had to get that in for the 
> thousands with an RV) I have a glastar sportsman. As usual much torment 
> with the changes. Spent 4 months trying to find a miss at full power. 
> Long story short, was too rich at full noise.  5 seconds to fix and 
> perfect ever since. Finally got Microtech to put a manual mixture knob in 
> the ECU which now allows quick and minute changes at any time, same as 
> Tracy's.  Interesting that Microtech used to offer the manual mixture 
> trim, but never sold one so deleted it.  Must be simple to attach for it 
> cost nothing for the addition. Others are now to follow suit to remove the 
> wear on the underwear. Currently building another engine pack up with my 
> own PSRU at 3.17 reduction.  Aim to ground test the PSRU on the ground for 
> 50 hours before I put it in my plane.   Amazing what you do differently 
> the second time around now that I know what Rad opening is required and 
> size radiator is a big help.  Current set up works well but is very 
> draggy, which is what I will change as much as possible second time 
> around.  Am also narrowing in the area behind the prop to a more "shark 
> point".  Looking at making an inconel exhaust manifold  to stand the heat 
> better. Still getting up to 1850 degrees on takeoff.  Possibly is just the 
> fact that I have EGT fitted which just makes me worry.  If I did not know 
> the temp then I would not have to worry. My expert tells me I just have to 
> keep advancing the spark until I get the coolest temp. How far before 
> detonation??   I am currently on 32 degrees, but they go as far as 45 
> degrees in drag cars!  That is to fiddle with on the ground, hence my test 
> bed setup.  IS very embarrassing when the noise stops in the air.  Will 
> also fiddle with mufflers as well for in 50 hours I might as well be doing 
> something other than burning fuel.  Best for new year.  Neil.
>
> -----Original Message----- From: Stephen Izett
> Sent: Monday, December 29, 2014 9:56 PM
> To: Rotary motors in aircraft
> Subject: [FlyRotary] Re: which oil for the fuel
>
> Thanks Neil, that makes sense.
>
> We're about to paint.
> So hopefully we’ll get a hangar soon at Serpentine and begin engine ground 
> testing.
> How’s the RV settling in after all he changes.
>
> Steve
>
>
>
>> On 29 Dec 2014, at 5:52 pm, Neil Unger <flyrotary@lancaironline.net> 
>> wrote:
>>
>> Steve,    Yep just use the old 2 stroke oil.  I suspect that with the 
>> leak and only "oil", the fuel is evaporating leaving the oil to take the 
>> blame. Have never seen the oil separate out yet after 12 months.  Flying 
>> yet?? Neil.
>>
>> -----Original Message----- From: steve Izett
>> Sent: Monday, December 29, 2014 7:03 PM
>> To: Rotary motors in aircraft
>> Subject: [FlyRotary] which oil for the fuel
>>
>> Hi guys
>> I couldn’t gain access to the archives so thought I would ask.
>> What oil are you mixing with the fuel?
>> I have been using some 2 stroke oil I had for our trimmer.
>>
>> I found a small leak in the pickup of the aux fuel tank that appears to 
>> be mostly oil, not fuel!
>> Wondering if this oil is not mixing well with the fuel, or coming out of 
>> suspention when allowed to sit for a few weeks.
>>
>> Your experiences very much appreciated.
>>
>> Steve Izett
>>
>>
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