flyrotary@lancaironline.net Mailing List Archive

Ok, resized photo attached, see if this works.

have to wait until I get back to town for under cowl photo's

Charlie

Airframe is Australian Lightwing SP4000 (only one in existance I think) all others are lighter weight versions,

empty 650Kg MTOW 1100kg, tube frame, non structural glass skin, aluminium wings, glass control surfaces, even has some wood for floor, so bits of everything.

210 litres fuel in 4 wing tanks.

2004 Renesis, RD1-c, EC2,EM2. GT electric CS prop.

MGL iefis avionics & Comms.

Bill

Not sure how well this photo will show but air enters under spinner into divergent duct which turns up into wedge duct at firewall then flows forward through heat exchangers, oil cooler is out of the 20b Cosmo, air flows over/around engine to front of cowl and exits in low pressure area with help of cowl flaps, might work, might not.

Exhaust was a bit of a dogs breakfast, couldn't exit underneath due to ducting taking up all the space, cabin fresh air inlet then dictated exhaust exit would be high on cowl, will suck and see how it goes and keep trimming length of exhaust until soot builds up on airframe.

I'm skeptical about the 20b Cosmo oil cooler, fin spacing is closer than on radiator so I think it must add restriction so air might take least course of resistance through radiator. option may be to get new oil cooler with same core as radiator. oil cooler is 1/3rd size of radiator & they sit side by side across firewall, sharing air from ducting.

Rich

I don't think downstream blockage is the issue. oil cooler air has clear run along right side of engine,only things in the way is the ignition coils & 2 stoke oil tank ( to be removed as going for premixing of oil) would be more of issue for coolant air as that has the block, intake & exhaust manifolds to negotiate.

putting thermocouples on is on the list to do.

Martin

Good to hear of another project in the making. Be good if Tracy decided to sell drawings for his drive if he cant get anyone to take on manufacture, plenty of places here capable of making them. just 1 off's will always be more expensive. or is Neil thinking of going into production of his? I got a 20b for next project which will need a drive also, once I find a suitable airframe.

Andrew

On Sun, Jun 28, 2015 at 11:36 PM, Charlie England <flyrotary@lancaironline.net> wrote

Hi Andrew,

Good to hear that another rotary is 'close' (to flying). I noticed the 1st line 'without photo'. Did earlier attempts bounce? I think the message size, including attachments, is around 200KB. Try resizing the image to 150K or smaller. If you need help resizing, let us know. There's a plugin for Win XP that makes it very easy; Win7/8 is a bit more convoluted but not that hard. I for one would love to see as many pics as you have time to send.

Please help those of us who are memory challenged & let us know which airframe. Runner length shouldn't be an issue (I hope it isn't; that's about the length of mine), since Tracy's Renesis uses intakes about that long.

Charlie

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