Welcome to Club SAITO !
08-05-2020, 10:47 AM
08-05-2020, 11:09 AM
08-05-2020, 11:59 AM
My Feedback: (1)
08-05-2020, 12:05 PM
My Feedback: (1)
Jim
Last edited by the Wasp; 08-05-2020 at 12:19 PM.
08-05-2020, 12:12 PM
My Feedback: (1)
Glowgeek Thanks for the suggestion. That still did not work so I decided to pull the engine apart and saw the cam was damaged probably causing it to no turn true. If you see the end of the cam of broken off. Which in turn was probably causing the intake valve to not function properly. Does not seem like any other damage was done but will fully break it down just in case. 
dang !!
what are you going to do now ?? does Horizon have a new cam ??
Jim
08-05-2020, 01:15 PM
08-05-2020, 01:20 PM
My Feedback: (1)
08-05-2020, 02:52 PM
With the Xoar 12x9 at 7000 rpm you are making only 2.88 lbs of thrust and .46 hp. Put a 12x7 on that same engine and you'll be making 5.31 lbs of thrust and .896 hp at 9300 rpm richened for flight.
Refer to bottom graph:
Hope this helps in some way.
Lonnie
Last edited by Glowgeek; 08-05-2020 at 02:55 PM.
08-06-2020, 03:58 AM
My Feedback: (2)
Hyjinx,
a .70 should spin that prop faster than 7K RPM, I think.
A similar thing happened to a friends Saito. We pulled the top covers and found that one pushrods had slipped out of its 'cup' on the rocker arm. One minute later, the problem was fixed and the engine ran OK...
Just something to check,
BOob
a .70 should spin that prop faster than 7K RPM, I think.
A similar thing happened to a friends Saito. We pulled the top covers and found that one pushrods had slipped out of its 'cup' on the rocker arm. One minute later, the problem was fixed and the engine ran OK...
Just something to check,
BOob
08-06-2020, 08:08 AM
Never tried the ceramics.
08-06-2020, 08:16 AM
The problem is that the 9 " prop pitch is too high, it's dragging down an engine that makes peak torque at somewhere around 8200 rpm and peak hp at well over 11k.
With the Xoar 12x9 at 7000 rpm you are making only 2.88 lbs of thrust and .46 hp. Put a 12x7 on that same engine and you'll be making 5.31 lbs of thrust and .896 hp at 9300 rpm richened for flight.
Refer to bottom graph:
Hope this helps in some way.
Lonnie
With the Xoar 12x9 at 7000 rpm you are making only 2.88 lbs of thrust and .46 hp. Put a 12x7 on that same engine and you'll be making 5.31 lbs of thrust and .896 hp at 9300 rpm richened for flight.
Refer to bottom graph:
Hope this helps in some way.
Lonnie
I knew one of you guys would pick up on that quick and make some suggestions I wouldn't have to research myself LOL.
I usually just use props that bring my Saitos to between 8500 and 9000 tops.
If that won't fly it I usually take a bigger Saito off the shelf and bolt It on.
I just don't like to sound they produce above that and conservative rpms make em last longer.
Just opinion there, just me.
Thanks Lon
08-06-2020, 08:25 AM
Hyjinx,
a .70 should spin that prop faster than 7K RPM, I think.
A similar thing happened to a friends Saito. We pulled the top covers and found that one pushrods had slipped out of its 'cup' on the rocker arm. One minute later, the problem was fixed and the engine ran OK...
Just something to check,
BOob
a .70 should spin that prop faster than 7K RPM, I think.
A similar thing happened to a friends Saito. We pulled the top covers and found that one pushrods had slipped out of its 'cup' on the rocker arm. One minute later, the problem was fixed and the engine ran OK...
Just something to check,
BOob
Point well taken. This one is ok mechanically. Just a little gutless with 10% nitro. It will do a bit better on 15% but I don't like the heat. I don't tune for high performance either. Like them rich a bit too.
Generally I don't get the type of results test data shows for any of my r.c. engines. Even brand new ones.
Probably just the black cloud following me around.lol
At least there is always shade.👍
08-06-2020, 12:24 PM
Helps in a big way Lonnie. Thanks.
I knew one of you guys would pick up on that quick and make some suggestions I wouldn't have to research myself LOL.
I usually just use props that bring my Saitos to between 8500 and 9000 tops.
If that won't fly it I usually take a bigger Saito off the shelf and bolt It on.
I just don't like to sound they produce above that and conservative rpms make em last longer.
Just opinion there, just me.
Thanks Lon
I knew one of you guys would pick up on that quick and make some suggestions I wouldn't have to research myself LOL.
I usually just use props that bring my Saitos to between 8500 and 9000 tops.
If that won't fly it I usually take a bigger Saito off the shelf and bolt It on.
I just don't like to sound they produce above that and conservative rpms make em last longer.
Just opinion there, just me.
Thanks Lon
Nothing wrong with running your engines a little slower than where peak torque or peak hp is made, helps with longivity. Now, if you go too far with over propping your engines and lug them down they will run hotter than needed and wear out sooner than necessary, same with under propping them to make them scream.
The fa62 and smaller engines are happy to run for many many years when propped for 10k on the ground so no danger there. Been there, still doing it today.
08-07-2020, 04:02 AM
The MA K-Series is distinctly thinner, more refined and feels stiffer than the older Classic, it has squared tips. It's supposed to be designed for larger 2 and 4 strokes. I need to try it out, maybe on the YS this morning.