First four stroke engine - RCCanada - Canada Radio Controlled Hobby Forum
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Old 01-23-2014, 02:03 AM   #1
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First four stroke engine

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Hi there
I just purchased my first four stroke saito engine. Could you guys explain how to properly install the propeller and spinner. Can i use the plastic spinner or is it not recommended?
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Old 01-25-2014, 05:24 PM   #2
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Re: First four stroke engine

Originally Posted by SloViper View Post
Hi there
I just purchased my first four stroke saito engine. Could you guys explain how to properly install the propeller and spinner. Can i use the plastic spinner or is it not recommended?
Good choice!
You didn't say how big it is. I run small to medium sized Saitos and haven't had any issues with plastic spinners but then I stopped buying the cheap discount ones back in my 2 stroke days as they do have a habit of blowing apart on a back fire. Aluminum back spinners add a bit of crash protection to your engine.

On prop installation I position them so that the engine comes up on compression in the 2 o'clock position for hand starting. The nut needs to be pretty snug too and don't leave the lock nut off as Saitos have high compression and tend to kick back hard if too rich on start up.

Also retighten your prop nut often when using a wood prop as they tend to crush a bit and loosen.

Hope that helps. Merv
Hang time does not apply to ceiling fans, light fixtures, overhead door tracks or basketball nets!
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Old 02-21-2014, 08:48 AM   #3
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Re: First four stroke engine

Four strokes are really nice. I try to use a prop that gives me 10000 RPM on the ground. The best way to set the high speed mixture is with a tachometer, With the throttle wide open peak the engine for max RPM then richen it up so you loose 300 - 500 RPM. Match the pitch of the prop to the type of aircraft. At that RPM a six inch pitch prop will give a max speed of 55 MPH and a four pitch will give a max speed of 35 MPH. Using an eight pitch prop on a trainer aircraft is really inefficient.

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