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1. 01:50 PM - 912ULS friction torque (jonathanmilbank)
2. 10:59 PM - Re: 912ULS friction torque (Alan Burrill)
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| Subject: | 912ULS friction torque |
Using a calibrated fish weighing scale at 30" and after locking the crankshaft,
while pulling steadily at right angles I once again got a reading of a couple
of pounds over maximum; about 15 lbs instead of the recommended 13.2.
I have an Airmaster hub with Warp Drive blades and the engine and gearbox have
done over 200 hours since installation. The whole combination runs smoothly, with
only a slight buzz while passing above 3000 rpm and which smooths out again
above 4000.
I've just done another oil and filter change which, as before, showed only a few
pin-prick sized metal particles in the filter after being cut open. Same as
always, with the particles being attracted to a strong magnet.
Considering that all seems well and satisfactory, even though the anticipated reduction
in friction torque with usage hasn't happened, should I be happy and
just let sleeping dogs lie? What's wrong with having the torque so high?
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=479873#479873
Message 2
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| Subject: | Re: 912ULS friction torque |
=46rom the ROTAX Maint Manual:
"Calculate friction torque (Nm) by multiplying the force (N) obtained on
the spring scale by the distance the scale is attached from the center
of the propeller (L).
The friction torque must be between 30 Nm and max. 60 Nm (22 to 44.3
ft.lb). See calculation example."
Where have you got the 13.2 from?
Regards
Alan Burrill
> On 5 May 2018, at 21:50, jonathanmilbank <jdmilbank@yahoo.co.uk>
wrote:
>
<jdmilbank@yahoo.co.uk>
>
> Using a calibrated fish weighing scale at 30" and after locking the
crankshaft, while pulling steadily at right angles I once again got a
reading of a couple of pounds over maximum; about 15 lbs instead of the
recommended 13.2.
>
> I have an Airmaster hub with Warp Drive blades and the engine and
gearbox have done over 200 hours since installation. The whole
combination runs smoothly, with only a slight buzz while passing above
3000 rpm and which smooths out again above 4000.
>
> I've just done another oil and filter change which, as before, showed
only a few pin-prick sized metal particles in the filter after being cut
open. Same as always, with the particles being attracted to a strong
magnet.
>
> Considering that all seems well and satisfactory, even though the
anticipated reduction in friction torque with usage hasn't happened,
should I be happy and just let sleeping dogs lie? What's wrong with
having the torque so high?
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=479873#479873
>
>
>
>
>
>
>
>
>
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