Hello, 

My motor is Xing 2207 2450kv. 
Shaft Length: 7mm 
Shaft Diameter: 4mm 
Stator Diameter: 22mm

I'm asking because I've ordered so many propellers and none fit without 3d printed "washer" to fill the gap.

Really !? Strange !
Usually all multirotor 5" fit and 4mm shaft is standard

(02-Dec-2019, 04:34 PM)jasc Wrote: Really !? Strange !
Usually all multirotor 5" fit and 4mm shaft is standard

5mm is standard I think... even my 3 inch 1407 motors are 5mm.

from 7“ to 3“ there are normaly 4mm shaft.
what propeller did you order?
an hq5x5x3, an azure 5150 x3, gemfan 5046 x3 ... something should work well.

(02-Dec-2019, 04:58 PM)hugnosed_bat Wrote: from 7“ to 3“ there are normaly 4mm shaft.
what propeller did you order?
an hq5x5x3, an azure 5150 x3, gemfan 5046 x3 ... something should work well.

Are you guys in Europe or something? If you go look up propellers 3 inch and 5 inch they're all 5mm. Maybe it's different across the pond.

5mm

5mm

Actually i'm just typing in 5 inch and 3 inch propellers and I literally can't find ANY that are 4 mm

Edit: I searched specifically for 4mm mounted props and can't find any at all..... This must be a European thing or something. IDK. Strange that you guys are all saying standard is 4mm.... I've never heard of a 4mm prop hole.

Are you not talking about the mounting holes? Maybe I misunderstood. I must've misunderstood what you guys mean :/ Never-mind me then ;D

true blowsmoke - thx, i wrote trash.. all over the world 5mm as standart.
there are ??4mm shaft motors from xing?? i would contact xing directly and ask for a prop recomandation.

(02-Dec-2019, 05:11 PM)hugnosed_bat Wrote: true blowsmoke - there are 4mm shaft motors from xing; i would contact xing directly and ask for a prop recomandation.

Are you guys talking about the thickness and not the mounting holes? I may have misunderstood. He does say 4mm diameter shaft though so....

I literalyl can't find any props with a 4mm mounting hole...... if xing motors have 4mm shafts that's fricken weird.

(02-Dec-2019, 05:11 PM)hugnosed_bat Wrote: true blowsmoke - thx, i wrote trash.. all over the world 5mm as standart.
there are ??4mm shaft motors from xing?? i would contact xing directly and ask for a prop recomandation.

ah. That's cool man... I thought it was yet another difference between the U.S and Europe 

Don't confuse shaft diameter with prop shaft diameter. They are two different things. Most motors in this class have a 4mm shaft (on the inside of the bell that runs through the core of the motor), and a 5mm diameter prop shaft (the threaded part sticking out the top of the motor onto which the prop fits).

It seems that the issue is with the actual length of the prop shaft whereby a spacer needs to be added above the prop as can be seen in the OP's picture HERE. The Xing motors have 13.5mm length prop shafts. My EMAX motors have 13.1mm length prop shafts, so 4mm shorter than the Xing's, and on mine there is no excess of shaft between the nut and the prop when the nut is fully tightened down. An there is no "excess" of threaded shaft sticking up out of the top of the nut when it's tightened down. I'm using DALPro Cyclone T5045C props on mine which have a hub thickness of 7.8mm.

Maybe the extra 4mm of shaft length on the Xing's is what is requiring a spacer to be used. I wonder why the OP can't just tighten the nuts down more without using a spacer and just have some of the threaded shaft of each motor left sticking up out the top of the nuts (?)

I'd be interested to know what props the OP is using and what the hub thickness of them are.

(02-Dec-2019, 05:56 PM)SnowLeopardFPV Wrote: Don't confuse shaft diameter with prop shaft diameter. They are two different things. Most motors in this class have a 4mm shaft (on the inside of the bell that runs through the core of the motor), and a 5mm diameter prop shaft (the threaded part sticking out the top of the motor onto which the prop fits).

It seems that the issue is with the actual length of the prop shaft whereby a spacer needs to be added above the prop as can be seen in the OP's picture HERE. The Xing motors have 13.5mm length prop shafts. My EMAX motors have 13.1mm length prop shafts, so 4mm shorter than the Xing's, and on mine there is no excess of shaft between the nut and the prop when the nut is fully tightened down. An there is no "excess" of threaded shaft sticking up out of the top of the nut when it's tightened down. I'm using DALPro Cyclone T5045C props on mine which have a hub thickness of 7.8mm.

Maybe the extra 4mm of shaft length on the Xing's is what is requiring a spacer to be used. I wonder why the OP can't just tighten the nuts down more without using a spacer and just have some of the threaded shaft of each motor left sticking up out the top of the nuts (?)

I'd be interested to know what props the OP is using and what the hub thickness of them are.

That's what I started to think as well... but he says 4mm 'diameter' shaft. but that's why I as wondering if he actually just meant the height of the propeller hub... the thickness. Because of the picture.... I think we need a clarification from the OP. Diameter is a straight line through a circle, he even has the measurement of the length of the shaft as well.... so I am thinking a clarification is necessary.

You said the length of xing shaft is 13.5 mm but he wrote that his is 7mm, and a diameter of 4mm.... something isn't adding up.

OP where did you get these measurements from?

(02-Dec-2019, 07:18 PM)bLoWsMokE Wrote: That's what I started to think as well... but he says 4mm 'diameter' shaft. but that's why I as wondering if he actually just meant the height of the propeller hub... the thickness. Because of the picture.... I think we need a clarification from the OP. Diameter is a straight line through a circle, he even has the measurement of the length of the shaft as well.... so I am thinking a clarification is necessary.

You said the length of xing shaft is 13.5 mm but he wrote that his is 7mm, and a diameter of 4mm.... something isn't adding up.

Everything the OP has stated appears to matche the specs of the Xing 2207 motors on the iFlight website. Take a look at the "Description" tab of the following product page and click "Show More". Scroll down the page any you will see all the specs and mechanical schematics:-

https://www.iflight-rc.com/index.php?rou...uct_id=760

• Stator Length = 7mm
  
• Shaft Diameter = 4mm (this is the shaft inside the bell)
  
• Prop shaft length = 13.5mm
  
• Prop shaft diameter = 5mm (M5)
  

OP, you just need to crank down the nut more. It is common mistake with beginners that they get scare to turn it down.

Yup, just keep turning that nut. Locknuts can be a bit hard to tighten the first few times. Don't be afraid to apply a bit of force just be carefull.

wrong thread voodoo - i guess into the x-class build thread ;-)

(04-Dec-2019, 10:30 PM)hugnosed_bat Wrote: wrong thread voodoo - i guess into the x-class build thread ;-)

You are too quick. I realize this as soon as I posted.