YS Engines

[vicenterc at comcast.net]

Looks like I need to learn how to re-pitch 3 blade props.

I have two planes a Hydeout (with retracts) with an OS 140 RX.  I would like to reduce the downline speed.  I have a Focus with a Mintor 140 that is OK on the downlines but probably will be better is I can reduce the speed a little.  

Yesterday, I tried to go down to 1500 rpm but the engine dies on the spin.  The minimum possible is around 1700 rpm.  

Another solution is for me is to buy a 3 blade prop standard that will work with the OS-140.  Any ideas?  

I just realize that I have to buy a new spinner also. 

Vicente
> Nat,
> 
> Yes and no.
> 
> No - given same prop and same idle RPM.  However, given the different nature
> of the engines, it seems pretty logical to me that the best 4C prop is not
> going to be the best 2C prop.  Idle RPM - the average 140/160 DZs I've seen
> idles faster and rougher than the average L or FZ (the DZs of course make
> much more power than the L or FZ), and the big 2C happily idles slower and
> smoother than a DZ, L, or FZ.
> 
> Yes - using a setup oriented for the 2C.  The last 2 years I've run an APC
> 15.75-11 3 blade (repitched from the 15.75-13) with the idle set at about
> 1700 on the OS 140 EFI (same idle speed when I ran the 140RX).  I believe
> this setup provides better downline braking than the average 4C setup
> (especially a DZ).  And if I choose, I can lower the idle to 1500 and it is
> still reliable and doesn't shake apart the plane.
> 
> The past 3 years, I flown a pair of EMCs that are 10.75 pounds and very
> clean (all servos, switches, fuel lines, fasteners, etc are mounted

> internally or flush).  The first year, a couple people thought I was
> constant speed - but too fast everywhere (too much power is such a terrible
> problem to have.........).  The past two years I've used the 3 blade, and
> many people at the NATs and locally (D1, D2, and D4) have remarked how slow
> my plane is in a downline, and how constant speed the plane is - which is
> nice to hear - because that was my goal after the first year.  Several
> others have tried the prop and plan to run it for 2004 - I think that in
> itself speaks volumes.
> 
> Dave
> DaveL322 at comcast.net
> 
> 
> ----- Original Message -----
> From: Nat Penton
> To: discussion at nsrca.org
> Sent: Monday, March 29, 2004 2:05 PM
> Subject: Re: YS Engines
> 
> 
> Dave can you get the downline braking with a two stroke you can get with a
> four ?          nat
> ----- Original Message -----
> From: David Lockhart
> To: discussion at nsrca.org
> Sent: Sunday, March 28, 2004 11:18 PM
> Subject: Re: YS Engines
> 
> 
> Ed,
> 

> I took a quick look at the 2003 Nationals results for Masters and FAI.
> Looks like 1st place in Masters was a 2C, and 5 of the top 10 in Masters
> were 2Cs.  FAI was won by a YS4C, and 4 of the top ten were 2Cs.  If memory
> serves me correctly, all 6 of the 4C fliers are sponsored by YS and one of
> the 2C fliers might be sponsored.
> 
> I've been flying FAI for 5 seasons and used 3 different 2C setups and don't
> feel that I am missing out on a warm fuzzy feeling.  Maybe that is because
> my 2C is cheaper, vibrates less, requires less maintenance, and is more
> reliable than a 4C (parts is parts).  And I've not yet found a 140DZ or
> 160DZ (w/ 30% nitro) with enough power to spin the prop I am running on my
> 2C (w/ 20% nitro) - and yes, my 2C has plenty of torque and a linear
> throttle.  Oh yes, it is also quieter and uses less fuel per flight than a
> 140/160DZ.
> 
> 4Cs became very popular in pattern when the rules changed to allow a 4C to
> have 2x the displacement of the 2C and YS very successfully exploited that

> rule change and designed and produced some very powerful competition 4Cs.
> Had it not been for that rule change, I doubt the 4C would have ever even
> become popular in pattern.  As the current rules do not give an advantage to
> a 2C or 4C, the 2Cs will return to dominance - unless the electrics take
> over first.
> 
> But then again, as others have pointed out, some pattern guys just like to
> buy the most expensive toys and spend endless hours tinkering..............
> 
> Regards,
> 
> Dave Lockhart
> DaveL322 at comcast.net
> 
> 
> ----- Original Message -----
> From: Troy Newman
> To: discussion at nsrca.org
> Sent: Sunday, March 28, 2004 11:16 PM
> Subject: Re: YS Engines
> 
> 
> Yamada the company that makes YS motors is dedicated to the support of F3A
> (pattern on the international scene).
> 
> The main reason YS motors dominate is because of their performance. The
> problem is there are limited sizes of motors....The YS 160DZ is now the
> biggest motor produced. It can fly about a 13lb plane and still have enough

> power to hover it. So a 100" IMAC model just isn't in the realm of the YS
> motor. If YS made a 100cc gas motor man alive would everybody want one. Mr.
> Yamada knows how to make Horsepower!
> 
> It is my understanding that Mr. Yamada used to work at Honda back in the old
> days when the small Honda motors were revolutionary in motor cycles, smaller
> compact cars and so on.
> 
> As for Fun fly planes the YS 63 is probably the ultimate power plant for any
> 46 sized model. Its got tremendous power and without a weight problem. The
> Flip 3D's, Madness, and other 3D funfly planes like the Hover Cobra, Magic,
> Razor, and UCD 46 are perfect models for the 63
> 
> 
> I have seen YS 140Sport,s and 140L's run scale models up to 15-17lbs and
> depending on the plane it will fly them but you will not have the extra
> power.
> 
> Now Heli's YS has a good foothold with the different motors they offer
> including a 91 4stroke Heli motor.
> 
> YS engines are probably the best model motors produced today.
> 

> I can choose any motor I want to run and I choose the YS motors above others
> because of the quality and performance. Here in recent years the 2cycle
> motors have taken a foothold in the lower classes of pattern flying. They
> make tons of power and tend to give a less experienced flyer a warm fuzzy
> feeling. They will make good power on 15% nitro and even not setup correctly
> they will make big power....I have run them from the OS EFI, to the Webra
> with mixture control carbs. With other in between.
> 
> I prefer the YS 4 strokes because they perform better. So the main reason YS
> dominates Pattern and not other forms is because they focus on pattern
> models and pattern type setups. Because of this focus the motors do the job
> the best....The bigger models just will have to wait for YS to produce
> bigger motors if ever.
> 
> 
> Troy Newman
> 
> ----- Original Message -----
> From: Edward C. Hernandez
> To: discussion at nsrca.org
> Sent: Sunday, March 28, 2004 8:55 PM
> Subject: YS Engines
> 
> 

>    Ok, time for another newbie question: it seems to me from the discussion
> and contest results and a few copies of the K factor that Kane gave me at
> the D4 contest last year that pattern pilots prefer YS engines, yet YS
> engines don't seem to dominate in other kinds of flying(IMAC, scale, fun
> fly, etc). Um, why?
> 
> Ed Hernandez
> 
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