iron eagel

Aeromat is supposed to be good for adding strength and not a lot of weight.

speedracerntrixie

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I have heard good things about Aeromat. I loaned my bagging system out but when I get it back I'm going to bag up some samples with Aeromat, Rohacell, 1/16 EPS and 1/16 AAA balsa and see what I like best.

speedracerntrixie

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Just thought I would post a pic of my 4 stroke speed plane.

iron eagel

Looks nice good luck with it.

speedracerntrixie

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Thanks Iron, will let you know Monday

combatpigg

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It looks super..!
The engine sits nice and neat in there.
The engineering on these engines has sure come a long way and they have continued to be able to sell them at a price that is affordable. The genius of manufacturing that we sometimes take for granted.

speedracerntrixie

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Thanks CP. I could not agree more. At first making the decision to go to the YS I was in sticker shock. 425.00 is more then I have ever spent on an engine without 2 cylinders and an ignition lol. But once it showed up I too can't see how they make any money on these. They actually have a groove machined in the front of the counterweight that holds a ring much like a piston ring that seals the back half of the crank case. I can't wait to fire her up, just finished balancing a couple 14X12 props to use for break in. Eventually I want to up the nitro to 40% and try a 13X14.5

combatpigg

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The first OS 1.20 [with pump] sold for about $400 over 20 years ago....!
Back when gas was $1.30 / gallon or so..?
I'd be curious to know what their world wide sales figures are and if they adjust the price if the engine is being sold in a poorer country.
I remember the built in pump needing to have a load of fuel pulled through it to "wake it" out of hibernation if you didn't run it every day.
I never tried it in a speed application. It could pull 9-10 pounds straight up with a 16 x 6. The pump made it run like it had fuel injection.

airraptor

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shawn you are going to run more than 50% in that arent you? If not i wonder if you will be down on power compared to a regular 115???

I plan to run it with 50% and no lower on mine.

speedracerntrixie

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Jeff, I'm thinking about a pattern airplane using this engine as well so yes I am going to be taking it easy on it. Not sure if the WS will be down on power over the standard 115 on the lower nitro or not but I know it will be far less of a shaker.

airraptor

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Are you running the standard Hyde mount or the mount from Richard?

speedracerntrixie

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I'm running my own flat plate composite mount that is bonded to the fuse sides from the nose ring to the wing LE. The fuse sides the length of the bonding area is a composite of 3 oz crowfoot glass cloth, 3K unidirectional carbon and 8oz S cloth.

MJD

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Well, that part ought to hold together.

geosam

looks nice r u running gold

speedracerntrixie

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Thanks Geo, that is the plan. Just hoping for some good weather on Sunday for the maiden.

speedracerntrixie

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I just remembered that I should do an update. The maiden went very well except I was a tad tail heavy. I tried to correct the handling with a reduction in throw and an increase in expo. It helped but the airplane just would not lock in on a line. I swapped out my lightened spinner backplate and moved the RX battery to the CG. That helped enough for me to get a gallon of 20% fuel through her using a 14X12N. In the end I used some stick on weight and added another ounce to the outside of the cowl. She was locking in now. Time to up to 30% and a 14X13N prop. A bit better speed. Race day came too soon, I didn't really feel comfortable with the airplane and I was still working out the 4 stroke as it had be over 10 years since I had run one. The first heat was slow but a clean race, the other guys made mistakes so I took the first place points. The next flight I got the needle right and won that heat the right way, same with the third. Wow I'm in the A main as the top qualifier, way cool. So here comes the main, 4 airplane heat. I got a poor start and began at the end of the pack, worked my way up to battling it out with the leader. In the end he managed to stay in front by .3 seconds. Ok great second place....WRONG. Did I tell you we have break out times? For our gold class anything faster then 1:25 for 10 laps on a 700' course ( 700 ft between pylons, each lap is more like 1,600 ft ) is a zero. We both lost the heat flying 1:23. The 3rd place guy gets the points. In the end I took home 3rd place.

combatpigg

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What is your speed and how well does the rpm match the actual speed..?
Four 4stroke planes up..this size would sound like a motorcycle gang...!

speedracerntrixie

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I was told by one of the long time 4 stroke guys in this series that the 1:25 time requires 160 mph average. If you want to do the calc, 13 inch pitch spinning 10.5 K in the air. Yes the sound of 4 YS 115 engines running high into ( 70% in some cases ) is quite a sound. Richard Verano was in attendance and ran a couple 1:14 heats with I beleive 55% and a 14x14.

combatpigg

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There are a lot of retired drag racers who would get a kick out of watching this.
Of course the most high profile Diamond Dust flyer was Eddie Hill.

speedracerntrixie

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That's funny. He just posted asking about a li-ion TX pack for a 10X. I told him it would be easier to run a 5 second 1/4 mile. Suggested he look at some LiFe batteries. LOL.

I am am thinking breaking 200 with a 115 is within reach. Obviously my airplane being a warbird has considerably more drag then a true speed airframe.

combatpigg

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What do you figure [or the mfg says] the absolute max rpm is of the 1.15..?
I do not remember what Chuck Roundy used for an engine and prop but he posted the fastest 4 stroke model plane I've seen so far.
I seem to remember that he had movable prop blades on a special hub. They could be adjusted on the ground.

airraptor

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chuck was/is running a 175 if I remember correctly.
Richard was running 60% on a 13.5x13.5 regular blade prop. His plane is very close if not at 180.

speedracerntrixie

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Jeff, that speed for Verano sounds about right. 20 mph would equate to a 1 second per lap differential. CP the max RPM that everyone seems to hold to is 11K. Out of everyone I trust on this series the highest RPM settings on the ground is 10,500. That's the beauty of the YS, you tell a number of these guys what nitro and prop you are running and they will give you an RPM accurate to 200 rpm.

combatpigg

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Time to make your own roller cam and some high test valve springs...!
See if Mr Conley is still going at it. http://youtu.be/1PK2BzUE8aw

speedracerntrixie

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I think the reason for the 10K number has more to do with the prop exploding then it does with engine failure.