Problem
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Possible solution or link.
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Calculating Redrive Ratio
If you have a paramotor for which you don't know the ratio you can
calculate it using one of several methods, measure the radius (or
diameter) or count the teeth.
Here are the details of each method.
Runup or Static
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| Grease or oil is dripping out the bottom of the
redrive. |
The geared redrive has been
over serviced with oil or grease and is leaking past the sealed bearings. |
| Motor revs up but the prop doesn't go with it. |
1. On clutched units, there may
be grease or oil between the clutch shoes and clutch bell.
2. On belt units, there may be extreme slippage of the belt. This is
sometimes accompanied by a burnt rubber smell. |
| Motor revs up but the prop doesn't spin at all. |
This can only happen on
clutched units and means that a prop side gear is jammed. A small piece of
casing may have broke loose and become jammed in the gears. Separate the
case halves and remove the debris. I've done this in the field but it took
some doing. |
| Prop spins on a clutched unit even at idle. |
1. Engine is idling too high.
2. Clutch spring(s) are broken. This should be fixed right away to prevent
other damage to the clutch or clutch bell which can escalate the cost
dramatically.
3. Debris in clutch bell.
4. Clutch shoes have artifacts on them. File down any protruding
imperfections on the shoes that might be engaging the bell even at low
RPM. (courtesy Rick Cavallaro) |
| I hear chirping at idle or a screaching noise
when I throttle up. |
1. Belt is loose. Tighten to
the manufacturer recommended tension. |
In Flight
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| Motor revs up but the prop doesn't go with it. |
On clutched units, there may be
grease or oil between the clutch shoes and clutch bell.
On belt units, there may be extreme slippage of the belt. This is
sometimes accompanied by a burnt rubber smell. |
| Motor dies when I throttle up from
idle. |
If it dies suddenly then it may be
that the carburetor needs adjustment.
There's a Reed Valve Problem
There's a problem related to the motor's torquing. In one case, above
about 50% power, the motor torqued enough to touch the kill wire on |
| Motor accelerates slowly when I
throttle up from idle. |
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Parts
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| Redrive Parts for the Aerocorsair Black Devil
172 |
Redrive Bearings
are as follows. You want the shielded or "sealed" variety.
- SKF 6004 2RSJEM. These are available from
Motion Industries,
formerly many outlets were called Berry Bearing. Motion Industries does
not, as of Sept, 2007 carry the equivelant NSK bearing listed below
although many other outlets do. They are both high quality bearings that
should provide long life.
- NSK 6004DDUCM
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