the only thing i know about wildcrap fuel, is i will not use it. the bird i fly with the 63 is 5.1 pounds all up with 8 oz of fuel, and the 14x4 pulls it out of hover well.
dunno steve, we can try, sure would be better on my feelings of anger, shall we say, to be ordering stuff from someone i like, and not the evil empires out there.

What do you have against Wildcat fuel? I love Wildcat, and their owner is a top notch, customer oriented person. I'm curious though, because I've never heard anything bad about Wildcat.


Thanks.
Reid

ifn ya really wana know, look at the fuel thread on outlawheli, otherwise, fuel wars get threads closed, so nuff said here.

I've used this prop , a narrow blade , since 94 . It's all that was available then . This is just in responce to someone asking about availibality of 14-5 props . I am using an APC 14-4 on my YS 63 , haven'y tried anything else , still haven't richened it since break-in , turns 11,990 on Red Max 30% .

APC 13x4W is the best 3D prop for the YS .63 in any plane under 6.5 Lbs. The proof is in the video [Eurokit NoLimit 3D flying by Zak West] located at www.3dbatix.com.

That's a bit of a broad statement, don't you think? There are too many variables to flatly say that any one prop is THE thing for "any airplane under 6.5 pounds".

I found a couple of 14x4 wood Top Flites at the LHS yesterday; I'll give them a shot this week-end.

This "test program" is making my propellor collection grow exponentially...<G>

Steve

I had a chance to fly the 13x4W on my 5 pound Laser 3D. I was having throttle servo problems, so I didn't do all the tach testing that I had intended.

Wildcat 20/20
OS F
APC 13x4W
Muffler: OS 70/90 Surpass with elbow header and OS 90 degree "In Cowl" header. (Sounds cool!)

11,300 peak. Backed out to 11,000 for flight.

Very good performance! Quick spooling. The new exhaust system has less back pressure, and my midrange needs some tweaking. The throttle servo went wacko as I landed so I had to cancel testing early.

I also have some Zinger 14x4 props, but they are a bit noisier. I will run comparison tests with these, and the APC 14x4W the next time I get out.

Chuck

Actually a broad statement would be, "ANY plane under 6.5 Lbs." I clearly stated the "13x4W is the best 3D prop for the YS .63." 3D being the operative word. That leaves a whole lot of other planes and prop combinations that would work fine with the YS .63. Again, the proof is in seeing (the video) not just talking about it.

<<...the proof is in seeing (the video)...>>

Perhaps.

I stand by my remark, regardless of what flight regime you were referring to.

Hi guys

I watched the video and your correct it is impressive, but where does it say what specifications his model is, I know you dont get a good idea of scale of the videos but that model is nowhere near 6.5lb.unless 20% nitro makes an enormous difference I cant see a ys 63 doing all that on a model that ways anymore than 5lb. however, when you are flying a 13x4W do you need to take care with the throttle to ensure that is does not over rev, because I had problems with the 14x4W over revving and the noise was just too much. not to mention the wear on the motor.

Mike

Mike, Im just curious, but when did your motor over rev with a 14x4w on it? Mine turns a 14x4w around 11k which for a YS is no where near over revving. As a matter of fact Im considering trying a 13x4w just to compare.

And my YS pulls the 5lb 9oz Flip very nicely. Its holding me vertical at half throttle and pulls out of a hover very nice. But I definately think 6.5lbs would be too much for unlimited vertical..........or decent vertical.

I like the 14x4W APC on my Laser 3D. 5 pounds 4 oz. It does have a little spool lag but it doesn't bother me... this plane is so predictable. I don't think it's over revving. I like it better than the13x6 APC. I wish I had a bandoleer of other props to try but just can't justify the expense.

Wow

Lots of diff opinion, and I suspect lots of different levels of experience using the YS engine.

Small YS fourstrokes need to be revved. The 53 more so that the 63 but even then you should not drop below 11k.

APC 13x4 W was a good prop for me for Fun Fly, and some 3D - depending on wind conditions. If the wind is up and you are flying 3D Aero as opposed to Fun Fly you need more pitch and less of a paddle blade - move to anything betwwen 12x8 - 14x5 N for this, but keep it to narrow blades and no less that 7 pitch for 12", 5 for 13", 4 for 14".

Propellow selection is important in performance planes..... but I would steer well clear of any wood prop, and some of the makes Ive seen mentionned deserve only a stirring job for household paint !

all I can say is dont treat your 63 like a big fourstoker - sure it will be alittle noise but it needs rpm it work properly - its only a baby remember !

<<...I would steer well clear of any wood prop...>>

Why?

I am currently working on my Flip 3-D. I have broken in and tested my YS 63 on the bench. I tested 4 different props. I have a very accurate method for measuring static thrust.

Fuel was Cool Power 30% Heli, but now I have switched to Magnum 30% DZ blend. I picked up about 100 rpm on the average with the Magnum fuel.
These readings are not peak, but backed off 150 rpm rich for flying. Fuel is Magnum 30% DZ blend.

Zinger 13x6 = 9,500 RPM, lifted 7 lbs, 12 oz.
Zinger 14x4 = 10,000 RPM, lifted 8 lbs, 2 oz.
APC 14x4W = 10,300 RPM, lifted 8lbs, 6 oz.
APC 13x4W = 11,650 RPM, lifted 8 lbs, 14 oz.

While the lighter wood props spun up a little quicker, they loaded the engine more at full throttle and did not produce the static thrust of the APC props. The APC 13x4W is a little lighter than the 14x4W, and spins up quicker, almost as fast as the wood props. And as you can see, it produced a half pound more thrust than the 14x4W.

Thats what I figured so I ordered one for my YS63/Flip combo. Ill be curious to see the difference in perfrmance.

Well that seems to prove it then !

Good figures, thanks for doing that .

Prove what?

Again, why should one avoid a wood prop? Are you saying one should avoid them with four strokes in general, or just the YS 63?

So, how about it, Archie?

Still waiting on your reasoning for avoiding wood props...

Sorry for delay

Just a personal pref. They are not as efficient as the like of APC, there is greater question over strenth particularly in the event of backfire, and they will not and should not be put to task after any kind of scuff. Ive seen people flick starting wood props with a safety stick, which is never a good idea in my mind on these smaller engines, it can damage them enough to cause failure in flight. A starter or glove should be used so as not to damage the prop.

Economy route on the big stuff 30 - 40 cc plus there are some good wood blades but the physics and loads are different here. APC props are heavy in the bigger sizes, so your non wood alternative ends up being carbon which will be better than wood for performance but cost a good bit more.

I switch to wood at 18" dia and above in general.

Not sayin Im right, just saying what I believe and practice. I know wood blades are quite popular over there in USA.

Okay, I hear you. Valid points, and while I don't think I'd be comfortable with a wood prop on a larger four stroke, I've used them with great success on the smaller ones (OS 48 Surpass).

Specifically, I'm looking to maximize the grunt of my YS 63 on 15% nitro. The lighter wood prop will put less of a load on the engine, allowing it to spool up faster, run faster, etc.

At least, that's what I'm thinking. The fact that it ran the best with a Top Flite 14x5 woody seems to vindicate that thinking. I finally found another 14x5 wood prop (Zinger), along with a 14x4. These will be tested next time I take the Somethin' Extra out.

But now that I've got the UCD flying, that could be a while...<G>

Steve

Its not all about RP and Spooling.

With YS 63 you can do valid static thrust tests, as the other guy did earlier in the thread, but there is no substitute for flying.

I have found Wood props to be less effective thrust generators than composite ones. That said there are some apalling compsite props out there - in my view dynathrust and master airscrew are amongst these.

I believe that you should ensure an APC 13x4W is on your list of props to try.

Good Luck

<<...there is no substitute for flying...>>

Agreed. If you had read my posts thoroughly, you would see that's what I do; fly each prop to see how it performs. I do a static rpm test on the ground, but that is just for comparison purposes.

I might try an APC 13x4W down the road, if the opportunity presents itself, but at twelve bucks a pop (five bucks for the woodies) I'm about burned out buying props.

Master AirScrew composite props suck because they flex so much. You can watch one flexing when you rapidly alter throttle setting. Cut one open, and you'll find big holes (air pockets).

The DynaThrust 13x6 on my SE right now seems to be doing okay. It is as stiff as the APCs I've tried.

I'll eventually settle on something...

I have not read thru everything.

Take your point about cost, but if you look at it from the point of it being a choice prop and not part of the testing - I mean theres enough evidence here for you already that says this is a ideal prop for fun fly use on this motor, then you are saving on the cost of a selection of woods,,,,,,,, just dont break it !

Dynathrusts are stiffer yes but they are heavy and dont have an efficient blade shape.
The only advantage I see in them is that they look more like a real prop - i.e. for scale and stuff.

Well, I wouldn't exactly call it evidence. I didn't watch the video; I don't download stuff indiscriminately, as you never know what else you'll pick up with it.

But I will take ya'll's word for it that the prop does well; for THAT airplane/fuel/plug/conditions combination. My contention is that there are too many variables in your gear, my gear, etc., to proclaim any one accessory as "ideal".

And you're right; one composite prop that works well is probably more economical than several wood props. I guess I did give a slight impression of being a cheapskate; such is NOT the case. But there are two things here you're not aware of.

First, a friend has the same exact plane/engine/plug combo I have; he tried a 13x4W APC, and wasn't overwhelmed with it. He said it did okay, but seemed to allow the engine to over-rev at full throttle in any but a climbing flight condition. We don't do a lot of hovering, harriers, etc. We like to toss the models around, but do a lot of "conventional" flying as well.

Secondly, since getting the UCD/YS 91 up, I've lost a lot of interest in the YS 63/Somethin' Extra combo. So I'll continue the "experiment" when I get back around to it.

This has been an interesting thread, indeed.