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Jun 28, 2006, 04:32 PM
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Discussion

OS FL 70 4-stroke Prop size


It is running a 12-7 at the moment. I think i would be interested in a 13-4 or even a 14-4 for more climbing power. How do you think this 4-stroke would do on a 13 or 14 incher.
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Jun 28, 2006, 06:17 PM
Ascended Master
Sparky Paul's Avatar
The Kadet Team uses thd APC 14x5N almost exclusively on our OS 70 4-strokes.
With a 13x6 as backup.
Jun 28, 2006, 08:16 PM
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So what is better

APC 14-5 or APC 14-4

I want good vertical performance
Jun 28, 2006, 09:03 PM
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You have to match your prop to your airplane and motor.
It can't be done without flying it.
Jun 28, 2006, 10:41 PM
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Thanks, i think i will try the 14-5 first.

I am a little worried about over heating and bogging the engine down. Do you see this effect with your engines.
Jun 29, 2006, 10:55 AM
Ascended Master
Sparky Paul's Avatar
The 14x5N seems to have been made for the OS 70.
Why the prop even exists is a mystery, but it -is- the prop for that motor on most planes.
It is also -expen$ive-... once the tips get ground down, the performance drops noticeably.
Jun 29, 2006, 11:32 AM
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It is kind of expensive

How do you think woods would work. The ones i am using now are wood but they do seem heavier
Jul 03, 2006, 04:47 PM
Registered User
14x5N is a pattern prop. I have heard that they are widely used in Japan with ys-63 engines. They are pricy and they come with 8mm hole if I remember right(saw these on the field). Wasnt fl-70 shaft smth like 6.5mm?
Jul 04, 2006, 10:52 PM
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I did notice that Kema. I decided to try the apc 13-6 prop instead.
Jul 09, 2006, 10:17 AM
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Hi guys, i tried a 13-6 with great results.
The idle is alot nicer
Jul 09, 2006, 10:30 AM
Ascended Master
Sparky Paul's Avatar
I haven't had to shim the APC 14x5N to fit the OS 70 shaft, which is 5/16"-M4, according to the manual.. It's been so long since I've had to change a prop on any of mine I don't recall if the prop needs to be reamed.
Jul 09, 2006, 02:33 PM
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i have the FL 70 though, not the FS
Jul 09, 2006, 03:52 PM
The sky is my playground.
Dora Nine's Avatar
I'm using a 12X7....been thinking of a 13X6...the plane's about 7 pounds....decent vertical....but nothing spectalcular...
Jul 10, 2006, 10:18 AM
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ivanc's Avatar
Quote:
Originally Posted by Dora Nine
I'm using a 12X7....been thinking of a 13X6...the plane's about 7 pounds....decent vertical....but nothing spectalcular...
Go for the 13x6 prop - you will notice some difference!

ivan
Jul 26, 2006, 09:35 AM
ProBro Spaz
spastic's Avatar
a great prop for that size 4stroke is the MAS Scimitar 13x6 nylon or wood and they are cheaper than the APC's the nylon one will last for a long time its very durable..
they have more bite than the 13x6 APC


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