Prop size and pitch suggestions

Razorback Flyer · Feb 24, 2013, 09:11 PM

Ok I have the H9 60 size corsair. I have a Saito 100 in it and Im running a 14x8 Master Airscrew K series prop. I cant get the performance out of the engine I think I may be able too. Ive adjusted Mixtures, and its either to rich or a tad too lean. Its like it wont totally unload like it should. Which direction should I go from the 14x8 or should I use a diff prop. I thought Id try the majority's suggestions before I go out and buy a bunch of props...

Thx, Terry

Danny_l · Feb 25, 2013, 05:35 AM

Hi,
the 14x8 sounds about right for your plane.
It should allow you to have plenty power while keeping it scale.
Brgds,
Danny

Razorback Flyer · Feb 25, 2013, 09:01 AM

Quote:

Originally Posted by Danny_l

Hi,
the 14x8 sounds about right for your plane.
It should allow you to have plenty power while keeping it scale.
Brgds,
Danny

Thx Danny, Yeah I thought so too, but when I get it where there is just a tad of fuel smoke trail, and I go from half or 3/4 throttle to full throttle it has that lean bog sound in the air. I wonder if a different type of prop would be different... But the Black Master Airscrew looks so good on her. I love this plane. Ive had her over 8 years. Had her put away for about the last 6... Installed a new cowl and retracts to doll her back up for the upcoming 1/8 airforce event here in March..

DGrant · Feb 25, 2013, 09:14 AM

Do you use a tach for tuning? I've found the tach is essential for tuning 4-strokes.

tacx · Feb 25, 2013, 10:48 AM

A popular prop size for your 60 warbird set up is a 15x6. Also, you may get better performance using a APC. You still have to buy the props in order to test them out.

Razorback Flyer · Feb 25, 2013, 07:25 PM

Quote:

Originally Posted by DGrant

Do you use a tach for tuning? I've found the tach is essential for tuning 4-strokes.

DGrant, I haven't used a tach since I started flying it again. I will tach it this weekend. Hardly ever used it though. Just used my eyes and ears..

but its the age thing ya know. probably not working as well!!!

DGrant · Feb 25, 2013, 08:31 PM

In alot of cases, the pitch of a 4-stroke engine is much harder to hear then a 2-stroke.. Using the tach, tune it to the peak RPM's.. peak peak... then richen it until the R's drop 300-500 or so.. that should put you into a very good range.. regardless of the prop..

With that said, it needs to be retuned with every prop... as the "peak" will definately change, with every prop... and it could ultimately damage an engine.. which is much less likely when tuned with the tach... not to mention.. theres a slight possibility(I might bet money).. that engine when tached and tuned just might pull that prop quite a bit better...

Good luck to you.. come back here with results.. I'm curious now. haha.. Have a nice evening.

Feb 24, 2013, 09:11 PM	#1
Razorback Flyer Registered User United States, AZ, Mesa Joined May 2012 53 Posts	Prop size and pitch suggestions Ok I have the H9 60 size corsair. I have a Saito 100 in it and Im running a 14x8 Master Airscrew K series prop. I cant get the performance out of the engine I think I may be able too. Ive adjusted Mixtures, and its either to rich or a tad too lean. Its like it wont totally unload like it should. Which direction should I go from the 14x8 or should I use a diff prop. I thought Id try the majority's suggestions before I go out and buy a bunch of props... Thx, Terry

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Feb 25, 2013, 05:35 AM	#2
Danny_l Registered User South Africa, WC, Cape Town Joined Oct 2011 392 Posts	Hi, the 14x8 sounds about right for your plane. It should allow you to have plenty power while keeping it scale. Brgds, Danny

Feb 25, 2013, 09:14 AM	#4
DGrant Registered User United States, CA, Clovis Joined Mar 2004 2,752 Posts	Do you use a tach for tuning? I've found the tach is essential for tuning 4-strokes.

Feb 25, 2013, 10:48 AM	#5
tacx Registered User United States, MI, Macomb Joined Apr 2009 1,939 Posts	A popular prop size for your 60 warbird set up is a 15x6. Also, you may get better performance using a APC. You still have to buy the props in order to test them out.

Feb 25, 2013, 08:31 PM	#7
DGrant Registered User United States, CA, Clovis Joined Mar 2004 2,752 Posts	In alot of cases, the pitch of a 4-stroke engine is much harder to hear then a 2-stroke.. Using the tach, tune it to the peak RPM's.. peak peak... then richen it until the R's drop 300-500 or so.. that should put you into a very good range.. regardless of the prop.. With that said, it needs to be retuned with every prop... as the "peak" will definately change, with every prop... and it could ultimately damage an engine.. which is much less likely when tuned with the tach... not to mention.. theres a slight possibility(I might bet money).. that engine when tached and tuned just might pull that prop quite a bit better... Good luck to you.. come back here with results.. I'm curious now. haha.. Have a nice evening.