|
|
Hi there Todd
Sorry, no.
Just tidying up some small issues in readiness for licensing.
Trim, Wideband O2, decals etc.
Our daily temps are heading down so I’m hopeful that when ready we might get an early morning in the low 50’s F.
This hopefully will give us a little more margin with the cooling.
Hope to provide more data shortly.
Steve Izett
> On 29 Apr 2018, at 2:44 pm, Todd Bartrim bartrim@gmail.com <flyrotary@lancaironline.net> wrote:
>
> Hi Stephen;
> Any news for us? I've been expecting a first flight report any day now.
>
> Todd
>
> On Fri, Mar 23, 2018, 17:16 Stephen Izett stephen.izett@gmail.com, <flyrotary@lancaironline.net> wrote:
>
> > On 23 Mar 2018, at 10:24 pm, Tracy Crook rwstracy@gmail.com <flyrotary@lancaironline.net> wrote:
> >
> > Haven’t had occasion to test the RV-8 this way but on an 85 F day my RV-4 will eventually get up to about 224F (oil and gas) while taxiing and stabilize there. This does not harm the engine at all. But if I were to start a takeoff roll at that temp the coolant will boil during a normal climb out. If I nurse it carefully (minimum climb rate & best cooling airspeed of 125 mph) it will start cooling down before boiling. Never gotten into a situation where this was an operational problem.
> >
> > Tracy
> >
> >
> >
> > Sent from Mail for Windows 10
> >
> > From: Stephen Izett stephen.izett@gmail.com
> > Sent: Friday, March 23, 2018 10:05 AM
> > To: Rotary motors in aircraft
> > Subject: [FlyRotary] Re: Glasair Testing Continued
> >
> > Hi Charlie
> > I do use Maximite, actually these days Geoff’s lattest Micromite, just better in every way.
> > The data is straight out of the Dynon Skyview log.
> > I will be using a micromite to display and log pressures around the coolers and cowl etc but haven’t finished the hardware or the software at this point.
> >
> > We will tie it to a tree in the next few weeks so I can check to mixtures.
> > I very much doubt it will keep cool at static, she’ll overheat within I recon 4 minutes at WOT.
> > Our prop doesn’t;t have much blade close to the spinner where the water inlet is. The oil inlet is lower and does get better air from the prop.
> >
> > Steve
> >
> > > On 23 Mar 2018, at 9:20 pm, Charlie England ceengland7@gmail.com <flyrotary@lancaironline.net> wrote:
> > >
> > >
> > >
> > > On Fri, Mar 23, 2018 at 7:35 AM, Stephen Izett stephen.izett@gmail.com <flyrotary@lancaironline.net> wrote:
> > > Hi people
> > >
> > > I know how much I have appreciated data over the years so for those interested here is some more.
> > > Having looked at last weeks test data and the temps looking like they were close to stabilised after reaching around 212F I thought I would risk it and see what the temps did get to.
> > > The temp senders are calibrated accurately up to boiling point (within <1F at 212F) but I’m not sure how accurate they are up at 225F.
> > > The graph below is 43minutes of repeatedly (12 times) taxing and then running down our ~1000yard strip at between ~20-37knots
> > > The OAT was 74-77F during this test.
> > > Renesis 4 port RD1C EC3 EM3 Elect Adj Prop
> > > Water cooler is 540in3 (custom dual pass) with inlet of 20in2
> > > Oil Cooler is 193in3 (mazda rx7 turbo) with inlet of 7.5in2
> > >
> > > I’m wondering what a 30row oil cooler like Tracy uses might do to both the oil and water temps.
> > > We will press on and hopefully flight test it as soon as we have it licensed.
> > >
> > > Cheers
> > >
> > > Steve Izett
> > >
> > > Hi Steve,
> > >
> > > Steve Boese has posted some of his pressure differential data on a Mazda cooler. He was seeing a really large oil pressure drop across the cooler, indicating highly restricted flow through it. Less flow=less cooling. Have you measured oil pressures on the inlet and outlet?
> > >
> > > As Tracy has mentioned in the past, short bursts of power won't really tell you much relative to sustained high power. Too many variables: inconsistent heat input, and inconsistent air flow for cooling (varying speeds). Since you have a controllable prop, have you tried tying the plane down & doing a sustained run at, say, 75% power? Surely the plane would get off the ground using 75% power, so if you can cool with static (only the prop) airflow into your heat exchangers, flying speeds will only help with cooling mass flow through the coolers.
> > >
> > > Are you the one using a Maximite to gather your data? If so, would you be willing to share your code? I can handle most things electronic, but I'm not any kind of coder at all. :-)
> > >
> > > Charlie
> > >
> > > Virus-free. www.avast.com
> >
> >
> > --
> > Homepage: http://www.flyrotary.com/
> > Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html
>
>
> --
> Homepage: http://www.flyrotary.com/
> Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html
|
|