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Greetings,

Here's the log = from=20 today's flight. Things are still going in the right direction=20 performance-wise, but I've got a ways to go.

Rusty (must port=20 wastegate...)

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Climbed out at 5 psi, and it still seems like = the best=20 climb rate is 100 mph. I = saw about=20 2100 fpm on the anywhere map, which is the same as my buddy’s 160 = HP RV-3. This confirms my belief that = it takes=20 about 5 psi to break even. = I got a=20 few whiffs of fuel, but the tanks were full, and I know that my RV-8 = used to do=20 that too. =

Climbed to 10,000 feet, and shoved the throttle = to the=20 max. Boost stopped = building at=20 about 9.5psi, but the power kept coming on as the throttle was opened=20 further. I’m = absolutely convinced=20 that 5 psi will be much stronger when I can get the wastegate opened up = more,=20 and that’s next week’s project. =20

Here are the speeds with 16=20 degrees of pitch on the prop:

Boost (over ambient) / MAP / RPM / MPH

Climb

5 psi / 38” / 5400 / 100 =20 (2100 fpm)

5 psi / 38” / 5600 / 120 (1600 fpm)

Cruise at 10,000 ft

5 psi / 30” / 6100 / 140

7 psi / 34” / =20 / 145

I’m going to leave the prop here for a while. I’m sure I’ll want = to increase the pitch=20 a bit more when I get the wastegate working, and get rid of the cowl=20 drag.

Did some stalls at about 10,000 = ft, and=20 there were no surprises, other than the high numbers. I’ve gotta get this ASI = checked, either=20 with the GPS, or with my formation buddy. The stall=20 comes with decent warning- much more than an RV-6, and less than an=20 RV-8.

No flaps, stall at 70 mph indicated

First notch of flaps (about 18 degrees), stall at 65 mph=20 indicated

Full flaps (28 degrees), stall at 63 mph = indicated.

After the flight, I found that the belly, and = tailwheel=20 were pretty oily. I had = recently=20 re-oriented the oil vent line, and it looks like all the oil came from=20 there. I must have = managed to get=20 it in the suction area behind the bottom edge of the cowl. I added a large diameter clear = hose,=20 with a drain valve at the bottom. =20 This is extended up into the cowl about 18”, then has the = smaller=20 diameter vent line stuck inside. = This is not an airtight fit, so the vent still works, but there = can be no=20 suction. I can also = monitor how=20 much oil gets out, and drain it as needed. =20

Finally,=20 I covered about a third of the radiator, to simulate the smaller rad = that I=20 intend to order. This = leaves me=20 with a core that’s 17 1/8” wide, and 17 =BE” = tall. It’s 2.25” thick, = for a total volume of=20 684 cu in. I’ll see = how this works=20 tomorrow.