Re: First Flights this season

[MarkW]

Congrats!!

How many are going to make a 1st flight this season??

 

[soneraii]

Count me in. I cannot foresee any show stoppers in flying my S-1 this fall.

All I have to do is paint a few pieces and continue final assembly. Now, I hate paint and it is never quick, but I am on it. I have run the engine this past couple of weeks. I anticipate no problems getting the DAR out here when ready with a few days notice. I do have some baffle work to do as well.

Kevin

 

[mhflyit]

Ditto Kevin - minus the paint hold up.

 

[964SS]

Good deal! First flights are exciting. Will be making first flight in my sailplane soon. Thene the Soneeai next spring hopefully!

 

[BoeingPilot]

did my 1st flight today in the sonerai, was a success, flew good

 

[eschrom]

Congratulations!

Ed

 

[Pttim]

Alright! Way to go!

 

[BoeingPilot]

Did some changes with the baffling and on the 2 & 3 flights today , cht was about 50 degrees cooler

 

[BoeingPilot]

CHT still about 475 in cruise at 3200rpm all other temps and pressures are good . Checked the cht probe and its within a few degrees of 212. F with it in boiling water.still open for any suggestions, going to try to glass in a bulk head behind the spinner plate inside the cowlings . Have heard that can create a low pressure area where air can escape .

 

[eschrom]

Do you have any photos?

Ed

 

[BoeingPilot]

I have pics in my gallery

 

[eschrom]

I see an engine but no baffles. Is that the way you're running it?

?
Ed

 

[soneraii]

Ditto, looked at your gallery, don't see any pictures of baffling?

Kevin

 

[BoeingPilot]

I'll post some when i get home

 

[dickf]

I don't think an aluminum head can stand 475 degrees for very long. My first flight gave me 425 degrees and I re-baffled to get 375 which I think is still too high of the conditions I was flying in. Since then I have modified the baffling again but am not quite ready to fly and check it out.

Dick

 

[BoeingPilot]

I used the plans from Great Plains and modified them to fit my cowlings. The red limit on the revmaster is 500 degrees, i would like to get it down below 400 degrees

 

[dickf]

I saw 500 degrees on climb-out about a year ago due to bad baffling coupled with a lean mixture. Getting the mixture right and reducing power got it down to 425. I talked to the Revmaster owner, Joe Horvath, and he said 500 degrees was approaching meltdown and he thought I should get the head temps at least below 400 degrees. I was concerned enough that I took the engine to the Revmaster facility where we removed the heads for inspection. They looked OK and there was no burned oil, etc., that is usually the hallmark of overheating. So I elected to use my heads rather than replace them.

Re-baffling got my temps down to 375 in cruise and Joe said that his engines usually run about 350 in cruise in typical installation. Revmaster engines in Sonerais are fairly rare and are quite a challenge to baffle in the front. My current goal is 350 in cruise.

Below you will find the latest specs for the current Revmaster engine. Max CHT is 450 in climb and 350-375 cruise.

R-2300 SPECIFICATIONS HP Rating:
85 @ 3200 Continuous HP: 80 @ 3000
Fuel minimum octane: Aviation grade 91/98 – 100LL
Conforming to ASTM D910 Oil: multi-grade 20/50
Bore: 94mm Stroke: 84mm 4 main bearings
Displacement: 2331 cc Firing order: 1 – 4 – 3 – 2
Compression ratio: 8:1
Spark plugs: 12 X 3/4 reach DCPR7E
Carburetion: RevFlow 36mm
Ignition: Quad CDI 8 coils
Timing: BTDC 25 degrees
Dual alternator: 20 amp each
Battery: 12V min. 20 amp
Crank flange: SAE #1 4-3/8″ bolt circle
Dry weight: 170 lbs.
OPERATING LIMITS Max rpm: 4200 Cruise rpm: 3000 +/- 200
Idle rpm: 900 +/- 50
Oil temp min: 130 degrees F
Oil temp max: 220 degrees F (measured at sump)
Oil pressure min: 10 lbs/1000 rpm
Oil pressure max: 80 psi
CHT cruise: 350 – 375 degrees F
CHT climb: 450 degrees F
EGT full rich: 1250 degrees F
EGT max; 1400 degrees F

Hope this helps,

Dick Frederick

 

[BoeingPilot]

Thanks Dick, only issue is the CHT being to high, but i'm glassing in a piece tomorrow and doing some caulking, hope to fly again on wednesday of my airline doesn't call me out

 

[BoeingPilot]

Ok posted some pictures of my baffles

 

[eschrom]

Not sure whether I'm doing something wrong but the pictures are small. From what I can see I would ask whether the top seal seals against the cowling, i.e., does it match the contour?

Ed