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YS-110 and 15X8

Old 12-25-2007, 07:05 AM
  #1  
selnekav
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Default YS-110 and 15X8

Hi Troy,
First of all i want to wish you and your family Merry Chrismas

i have small question from your expirience what prop will cause less load to the YS-110
14x10 or 15x8 ? according to the HP calculator the load is similar but i wonder if the engine torque will better manage with the 15x8


i already run the engine with 14x10 at 9000 rpm but i got the impression that the engine worked too hard. ( it's below the target numbers that you always mentioned 9200-9600 ), so i switch to 14x8 and now it works smooth but it's too small.. ( there is no option to buy 14x9 or 15x7 here )

Thanks
Shlomo
Old 12-25-2007, 11:37 AM
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onewasp
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Default RE: YS-110 and 15X8

How much nitro? ------ better yet what % nitro/% oil?
Old 12-25-2007, 11:43 AM
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Troy Newman
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Default RE: YS-110 and 15X8

Those two props will likely turn close to the same rpms. The lighter weight prop will likely unload better for the engine. The only way to know for sure is to try it and see. Yes 9000 is just below the target rpm but you are right there. The engine make shake a little more than if it was at 9400 or so...but 9000 is not a bad number.

This will all depend on the fuel you are choosing to run.

The 14-10 on some 30% heli might end up being a little too light of a load but on 15% its too much.

You need to choose you prop based on your specific circumstances. The 14-10 and 15-8 will likely weigh close to the same...the less pitch the better the easier to spool up the engine....so it might be about right. The next thing is then the model. Each model will react a little differently to the prop. Everybody is looking for the best prop for the engine. The reality is the airframe has more to do witht he prop choice than the engine. Now you can't runa 22-12 on a YS 110 but when you get the rpms close to the target range then the airframe will determine performance of the prop.

When we fly pattern models there are larger choices for the prop selection. Look at the 15" range for the 120 and 140 engines.

15-10, 15-11, 15.5-11, 15-12, 15-12W, 15.5-12W, 15.5-12.5W, 15-13N, 15-14 And this didn't cover all of the props that have been available in this range. There was even a 14.5-14N that was an awesome prop on the 120AC with the Dr Jeckyll 2. The reason is pattern guys like to experiment. Also you get a prop that is just about right...say it pulls really good but is just a touch noisy, can we reduce the rpms just a little to help the noise. The answer is yes go from the 15-12 to a 15-12W...no you get a little better braking effect, and the rpms are reduced just a little.

All of these props above in the range would work for say 140FZ but when I flew in Colorado at 5000ft elevation we had to use the 15-10 or 15-11. Going to sea level or near sea level all of a sudden the 15-12 and 15-12W were better props and more viable. This was on the exact same model. Now fast forward a year or two and go to a slightly wider nose on the model, the wide body style of pattern planes didn't like the 15's as well. All of sudden is was a 16-10 or some cases a 17-10N Another one that was kinda neat was a 17-8

Currently my monoplane Astral XXc on a YS 170DZ likes an 18-10 or 18-11. However I also have a biplane pattern model called Adventure. It weighs just about 6-8oz more than the monoplane and has more drag. It likes the 17-13 and 16-14 This is running the exact same engine...I pull it out of one plane and throw it in the other.


So conditions play a huge role, airframe also makes a big difference in performance. You have to try it and see what works the best for your situation and your model.

My advice is experiment and see what works best. APC offers a huge selection of choices and in a given circumstance they are all good options....The props above are for the 120-140's but there are good selection of choices down in the 110 sizes too.


Troy Newman
Team YS
Old 12-25-2007, 01:34 PM
  #4  
selnekav
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Default RE: YS-110 and 15X8

Thanks.

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