Today's Message Index:
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1. 08:00 AM - Re: Going to a 72" prop (Richard Pike)
2. 03:21 PM - Re: Going to a 72" prop (Charlie Mike)
3. 05:19 PM - 503 temps ... (artdog1512)
Message 1
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| Subject: | Re: Going to a 72" prop |
I did end up flipping the motor mounts over, plus the original spacers, and also
added two extra washers to the rear mounts to get the required 1" of clearance
from the tail boom. Once everything was installed, I hung all my body weight
onto the prop hub and the prop tip still had about a 1/2" clearance, so that's
good.
It is now a lot trickier to take off, you can't just cob the throttle and go like
previously, it now wants to yaw hard to the right if you try that. You have
to keep the tail planted firmly on the ground and use partial throttle until
the airspeed gets to 30 and the rudder becomes fully effective, then raise the
tail and go to full throttle. In cruise the ball wants to be 1/2 out to the left,
will need a bigger rudder trim tab.
Rate of climb is better by about 300'-400'/min, very pleased at the smoothness
and that it is quieter, but getting the 582 to be happy with this gearbox/prop
combination was & is perplexing. For whatever reason, it has to be a lot leaner
at cruise.
Idle jet is down from a 55 to a 50.
Needle clip position is supposed to be a 3, it is now a 1. This is with new needles.
RPM on climbout is 6350, EGT's at 950-1000.
Cruise is normally 5350-5400, airspeed around 65-70, EGT's 1050-1100.
If you throttle back to less than 5350, the engine falls off the pipe and the rpm
will decay down to around 4600 and then stabilize at that rpm, with EGT's around
950.
As soon as you give it the least bit of throttle, then the rpm begins to rise,
eventually stabilizing again at 5350, EGT's back to 1050-1100.
Ignition system was completely replaced last year, plugs are new, plug caps are
new, EGT gauge and probes are new, jet needles and carb boots are new, choke
pistons are new, air filter is clean.
It starts easily, runs smoothly and seems entirely reliable, the only other thing
that is different than from before when it had the B box and the 68" Ivo is
that I have not yet put the after-muffler back on it. That shouldn't make a difference
but it is the only variable that has not been tested. It wasn't like
this before, where ever you put the throttle back then, that is where it ran.
I can live with it, but I'd like to get it resolved.
Different topic: Last week completely reloaded Windows 10 to fix an ongoing problem,
and lost my image resizer. The one that MS offers is a total pain, finally
found this one, works like it should. https://en.lo4d.com/windows/image-converter
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Richard Pike
Kolb MKIII N420P (420ldPoops)
Kingsport, TN 3TN0
Forgiving is tough, being forgiven is wonderful, and God's grace really is amazing.
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Message 2
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| Subject: | Re: Going to a 72" prop |
Richard thanks for the detailed report!
I just spent 4 hours flipping those dang lord mounts. No easy way to get to them.
I put one additional washer between the lord mount and mounting plate at
the rear. That will slightly increase the downward thrust angle. I have a 68 3
blade Kool prop. Like a Luga. Very light weight. Hopefully next week I will be
making some static thrust runs
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Kolb Slingshot 582, C gearbox.
Read this topic online here:
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what is the max cylinder head/exhaust gas temps for a Rotax 503?............ 2
Broke Tim
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