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Miniplane Paramotor
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Miniplane Paramotor

Miniplane Paramotor Torque Tips

In regards to Bolt Torque Values (under Maintenance):

http://www.miniplane.com/inglese/manual/manuale.htm

 

 

Propeller Torque Values

I try and use 80 inch pounds on wood propellers. On some wood propellers the wood is too soft so I try and go as high as I can, sometimes it can be as low as 70 inch pounds on some wood (Maybe even lower). On carbon props I go with 85 inch pounds.

-Francesco


 

More Torque Tips

My torque wrench is delineated in inch pounds. If you have a torque wrench that uses Foot pounds you will have to convert to Inch pounds first.

Torque is a complicated subject especially if you’ve never had any experience with it. 

I should have added that it also matters which bolt you have (size and material). 

1st. you determine what “material” your bolts are, (ie. heat treated steel, stainless steel, etc). This is usually marked on the top of the bolt. If you change the bolts it matters! I upgraded to stainless steel bolts which have better corrosion resistance near water but are not as strong. They are marked A2 - 70. 

Next you verify the size of the bolts. Mine are the standard Miniplane M6. But I have used in the past the  Miniplane bolt kit offered as a “fix” for larger props that were breaking bolts. If the paramotor was bought second hand you should check this… not all larger props use this larger bolt but if they do, the torque values would be higher. 

Once you are sure of the size and material of your bolts you can look up the torque values. When I  Googled torque values for bolts made from A2 70 stainless, in M6 size, it was 77.0 in. lbs. dry, or 69.3 in. lbs. lubricated. Lubrication is yet another variable that can make a difference. I don’t lubricate my bolts because I’m afraid they might loosen up in a high vibration environment holding on a prop. 

Torque values are theoretical science. There is some wiggle room. In the field is what really matters. If your bolts are getting loose you are probably torquing them incorrectly or unevenly. If they are breaking you are probably over torquing them. I rounded 77 up to 80 and have never had a broken a bolt or had them come loose.

Also, when you first put on a prop on and torque it, you should check after 1 hour to make sure it is still tight at the specified torque. After that it should be fine. If you remove it, you need to it check again after 1 hour.

Hope this helps, feel free to use any of this info.

Best,

M

 

 

Copied from the Miniplane Online Manual:


LOCKING TORQUES

bolts and knots

Metric

metric wrench (mm)

torque (N.m)

torque (lbf.in)

motor cylinder-head studs

M6

hexagon 10

 9

do check for the symmetric fastening.

80

prop

M6

Allen 5 -
hexagon 10

9 / 11

go to prop setting

80 - 100

engine elastic mountings

 

M6

Allen 4

10

special directions : do not twist the mountings  while screwing, do not use screws longer that the standard ones, the screw thread must not enter more than 6 mm 

90

M8

hex 13 or Allen 6

15

special directions : do not twist the rubber mounting while screwing, do not use screws longer that the standard ones, the screw thread must not enter more than 8 mm .

140

5 mm  fastening for diaphragm carburetor and plastic flange 

M5 (Black anodized aluminum)

Allen 4 or hex 8

4

crankshaft nuts (clutch and ignition flyweel)

M 10 x 1,25

hexagon wrench  17

35
right screw thread  

330

spark plug

please refer to manufacturer manual (remind the 2 mm washer, use 2,5 or 3 mm washer with very poor octan number )

muffler flange

M6

hexagon wrench  10

 hand fasten and stops 1-2 mm before the compression of the spring (5) about 1,5 turn.

engine mountings

miscellaneous

4 mm

attention:
reduce by 50% with screwsmade ??of aluminum or shortthreads
 on aluminum,
reduce by 60% with screw on plastic

2,5 - 3

miscellaneous

5 mm

4 - 5

 

6 mm diameter

9 - 11

 

8 mm diameter

20 - 24

 

for each bolt/nut you can  use 1 or 2 drops of medium strength screw glue