Hi Ken,
Specifically which part of the alignment is bad? Do you mean the pulleys
are too close together or are too far apart or ar offset? Are you talking
about the alignment on the lift belt idlers or something else? I have
fixed
the rear idlers for the thrust prop by putting a bend in the bar holding
the
pulleys. I have the craft torn down for paint so I'll be doing all the
belts over again. If you can let me know what you saw that was out of
alignment I'll be sure to make it right when I put it back together.
Thanks
for taking the time to watch the videos.
Brendin
Brendin
"Ken Roberts" <forums@[EMAIL PROTECTED]
> wrote in message
news:22cda41b-24fa-48f8-9a1b-9348fc9599f8@[EMAIL PROTECTED]
> On Jun 7, 3:32 pm, "Brendin" <some...@[EMAIL PROTECTED]
> wrote:
>> Hi Ken,
>>
>> Did you watch the videos on that page? The links are at the bottom in
the
>> text on the left hand side. It shows the mid-idlers in use. It
worked
>> well from my tests. Proof will be long term usage.
>>
>> Brendin
>
>
> Brendin,
>
> I finally got around to watching the videos. I didn't get any sound,
> so I probably missed some im****tant information.
>
> First, your belt alignment is bad and will cause problems. Belts
> tolerate some misalignment but not as much as you show. Add a little
> bit of water spray and you'll start having all sorts of interesting
> projects to work on.
>
> For belt oscillation, you need to check it all through the RPM range,
> or at least the lower range. You also need to have a realistic load
> on it to see what really happens. That goes especially for the pulley
> alignment part.
>
> Ideally, there is no contact between a vibration damping idler and the
> belt, except when there is actual vibration. That might not be
> possible here, but whatever you do keep in mind the RPM these pulleys
> can be turning. If your engine pulley is 9" and the idler is 4.5",
> then your idler can turn up to 7200 rpm. The cheaper idlers have
> cheaper bearings too.
>
> All this stuff is related. Imagine going across a lake in a wind.
> The waves are pounding, you have to maintain a fairly low engine speed
> in order to keep things under control. The speed of the engine goes
> in and out of various frequencies which resonate with different parts
> of your belt. A wave hits your thrust prop in a way that torques on
> the entire structure, and that causes the entire mess to come apart
> because your pulleys aren't aligned, or because your idler can't quite
> keep the belt in position.
>
> IMO, you need to align every pulley with center as best you can. Good
> enough for your garage and good enough for the average day out is not
> necessarily good enough for when you got caught miles from your car
> and a storm comes up without notice.
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