Hi

I have a YS 63 in the small glens models cap, running a 13x6 (10% Nitro) Its quite a handfull when trying prop hanging so I purchased a APC 14x4 to see if this would help, well the thrust has decreased and the engine rpm`s have gone up, the vertical performance was poor and the model was generally more sluggish in aerobatics. I thought the 14x4 was the prop that was recomenced by all the top 3D fliers??? So what is the best prop for the YS 63, my money is on the 13x6 APC

Mike

Oh, man; don't tell me that. I too have been looking for the "ideal YS 63 prop, and just ordered an APC 14x4W. Since they don't list any other 14x4 (that I can see, anyway), I'm assuming that's what you have.

The best prop I have tried so far (on a SIG Somethin' Extra) is the Top Flite 14x5 wood. The 13x6 APC Sport (skinny blades) pulled the model too fast for my tastes, but did work well. I broke the 14x5 on a sloppy landing, and am now using a 13x6 DynaThrust nylon propellor. The day I tried it was extremely windy, so I don't know yet just how it does in normal conditions.

If the 14x4W doesn't work out, I'll probably go with the 14x5 Top Flite. That one did real well; the wide blade chord slows the model down to a crawl, yet has plenty of thrust for vertical stuff.

I have been unable to locate any other 14x5 props of any kind.

Steve

I've been hearing that a 13x4 is a great one for the YS 63. I haven't broken my 63 in yet, so I don't have any first hand experience, but from the "research" I've been doing, 13x4 and 14x4 with nitro of 20% or more (30% optimally) have been what most people like. Dave Shadel on the YS Support forum says he likes his props to turn in the 10-11k range. He says the throttle response is best at that RPM.

Reid

rplumbo is correct. The APC 14x4W is a good one on a well broken in 63 running 20% or more nitro. I used one last year, and I was turning it at about 9600-9800 if I recall. I'm using Wildcat YS 20/20. I certainly would not even try to run my YS on 10%. I tried 15% Omega once, but the performance gain on the 20/20 is noticable. The main thought that keeps surfacing is that you will see a good gain by going from 15 to 20%, and a bit more if you go to 30%. I'm just too cheap to pay for the 30%.

Dave believes that the 63 is happiest at 10-11K, as already stated, so with that in mind I purchased an APC 13x4W to try. It should spool up faster and let the 63 let loose a bit.

Central Hobbies carries both of these props.

Oh, forget the APC 13x4 "regular" prop. It turns about the same on my 46FX as a 13.25x3.75. You want the 13x4W

Chuck

I broke in my first .63 with an APC 13x6 on my Ultra Stick. Worked great.

I now have this engine in my WM Zen 50. The 13x6 didn't work as well here as this plane likes speed more than thrust - I swapped it out for a 12x8 and have now settled for a 12x7.

BTW you *wil* see a difference with 20% + nitro fuel. WHen I first started running YS engines I did so with my usual 15% fuel. The engine ran OK, but was fussy to set and the power wasn't what I expected. Tried a gallon of 20% and whoa! More power, more consistent needle settings, etc. I'm now running 30% fuel - this gives a power boost over the 20% but the fuel economy takes a hit as I have to open the main needle a bit more.

I use an APC 13x6 or Graupner 12.5x6W on mine. 13x6 is better for pattern, but the wide is better for 3d... i'd take the 13x6 out of though.

I'm gonna geta 14x4... this is from what i hear the optimum 3D prop.. not sure why yours has come out the way it did... ill keep you posted.

Im running a new YS 63 that I broke in with Wildcat 20/20 YS Blend using a 13x6 Zinger. After a few flights I swapped to the APC14x4W and I like it alot. I did loose maybe 500 RPMs and the rate at which it spools up is just a little slower. But overall the performance seems to be much better. I can hover my 5lb 8oz Flip at just under half throttle and the vertical pull out is very good.

I have only run about 7/10's of the first gallon through this motor as well.

I really like the way the 14x4W slows the plane down. I had a really hard time putting her on the ground with the 13x6 but I had it idled a little high during initial break-in.

I've had the best results with an APC 13x6. I'm running the engine on a Dave Patrick Ultimate 40 with Coolpower 30% heli fuel. This gives great performance in a hover and still has enough oomph to tear around the skies. It will turn almost exactly 10,500 rpm static at around sea level on an average temp day.

The static rpm`s of my YS with a APC 13x6 is 11000 on 10% coolpower so what is the point of putting 30% Nitro in????

Mike

Mike,

Exactly so. Yes, the higher nitro will give some more top end, and a better idle. Define "better"; mine ticks over between 2000-2100 with the nylon 13x6, and was down to 1900 with the 14x5 wood. Mine is still new, and I still have it quite rich, so there's no point in looking at the static top end rpm yet. But it has plenty of power to make the model do what I want it to. So what more do you need?

All of this is on 15% Cool Power. Mike, many US modelers are in love with 30% nitro fuel because it nearly eliminates the need to fine-tune an engine. I ran it for years in my helicopters, and the few times I tried it in my airplanes the performance increase was quite noticeable. Fine; if you want absolute speed, and don't want to take the time and trouble to dial your engine in on lower nitro, go for it. Personally, I got tired of paying over twenty dollars a gallon for the stuff, so I went back to 15% across the board and have been quite happy.

I'm with you; who needs the higher nitro? I do think the smaller YS four strokes are happier with high nitro, but they can be made to run satisfactorily without it.

Steve

I run a 12x8 for pattern and 13x5 for 3D on my seduction. happy with those props.

I would love to put more Nitro in my YS but 20/20 fuel here is £25 a gallon and I can burn a gallon of fuel on even the poorest weekend. When I fitted the 14x4 the rpm`s did go up and you got that awful screem in the downlines, so you had to be really carefull with the throtte, I dont know how you can run a 13x5 wont the rpm`s be to high. The fun fly props do appear to be much wider and a different shape all together so maybe they cannot be compared to normal props. I think for now I will stick with the 13x6 and possibly go up to 15%. For all those wanting to try a fun fly prop I know steve webbs has the 13x4W and 14x4W APC in stock now!

The YS in my cap has the power to do everything, However I was trying to make prop hanging easier as it is a little unstable. so any advice would be gratefull.

Mike

Who said anything about a 13x5???<G>

Try a 14x5 if you go up to 15% nitro.

Steve

The Candy Man just delivered an APC 14x4W.

If they weather cooperates, we'll try her out this week-end.

Stay tuned...

Steve

Here we go- yesterday was quite enlightening.

Ok, I knew that the YS 63 was happier on higher nitro, but I got very graphic evidence of that yesterday.

My 63 is on a SIG Somethin' Extra. I'm using 15% Cool Power fuel. I know about the advantages of higher nitro- I use to run 30% heli fuel. I don't WANT to pay the premium for higher nitro, OR go through the hassle of lugging two kinds of fuel to the field. BTDT. If it doesn't work with CP 15%, I don't need it.

This engine just came back from having the piston replaced, so I'm still running rich in case the ring was replaced too. It was quite unhappy with the 14x4W at this rich condition with 15% fuel; spool-up was slow, and the engine was surging at half throttle. The airplane was basically a pig.

So we put it on my pal's 63. This engine is well broken-in, and is fed a home-brew 20% nitro blend. It was turning 10,300 on the ground.

Flight results were nothing short of spectacular. The model is a Dave Patrick Ultimate ARF, and this prop is perfect for it if your engine will turn it.

I went back to the DynaThrust 13x6 on my SE, and am satisfied for now. The wider chord of this prop slows the model down enough to where I want it to be. Perhaps when I lean my 63 out a bit it will like the 14x4W wide better. But there is no substitute for nitro to get the max performance from these engines.

That little Ultimate has a lot of drag, yet now will accelerate while vertical. On the down lines, chopping the throttle is like throwing out a drag chute.

Of course, this means you had better stay on your toes when landing. This model, like most bipes , gives very little warning as you approach Vmc, and when you get there it just quits flying.

But the 14X4W prop did indeed expand it's flight envelope considerably. Moral of the story; if you want the benefits of these "3D" props on a YS 63, you need high nitro (the 91FZ turns the APC 16x4W just fine on 15%).

The added expense is not worth it to me, so I'll continue to muddle about with my 15%.

This has been interesting. Looks like some sort of 13x6 is the best general-purpose prop for the YS 63; but we already knew that, didn't we...<G>

Steve

i've ben playign with props too.. tried an graupner 12.5x6 W and APC 13x6.

The graupner has way more thrust and is much better for 3d, and also pattern too.

a friend tried a 14x4 on his irvine 53 instead of the normal 13x6 and i'm sorry to say it came straight back off.. it was basically totally useless for 3D.

There we go.. get your graupner 12.5x6s out!! My test was on CP 10%.

I am very happy with the APC 14x4W on my YS 63 powered Flip 3D. I use 30% nitro fuel though.
I think if you use lower nitro fuel the engine is not going to have the extra power it needs to turn the 14x4W good and that's why some of you are not liking it.
I used to fly on 15% nitro, but have switched to 30% now and just love it. What a difference!
I was constantly adjusting the engine on 15% nitro, but now on 30% nitro I never have to touch the engine settings and the engine runs so much nicer. It is worth the extra $6-$7 a gallon to me.

Jim

i've been todl to use 30% heli fuel... just researching the expenses!

Yes,
I am using a 30% nitro fuel with a low viscosity oil that is like heli fuel.
I'm using the Magnum "DZ" blend fuel that is made with low viscosity oil for the YS 140 DZ. I use it in all my YS engines now and they just love it.

Jim

COOLPOWER 30% HELI FEUL........

..is expensive where i come from

Mine did okay with 20% nitro and the 14x4W, but I bought a 13x4W to get better spooling and pick up some RPM. Haven't run it yet.

Chuck

mine, YS63, liked the 14x4 wood zinger best. but they are rather hard to find out here in the hinterlands, so i settle for the 14x4w APC.
30% heli CP is the fuel of it's choice as well.

While it is doing okay with this 13x6 DynaThrust, mine really liked the Top Flite 14x5 wood on 15%.

Next time I order from The Empire I'm gonna get a half-dozen of those puppies.

Say, mongo, think we can convince Ron to carry props???<G>

Steve

How does it perform using APC 14x4W with Wildcat 20/20 fuel? Is that enough nitro to use for it? Will the APC 13X4W or 13x6 be able to pull a 6lb plane out of a hover - GP extra 40 size? I plan on using this engine for that kit. Thanks for your help.

-Brian