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[Ben Tickle]

Hi,

Just wondering if a boat only has one prop, how do you distinguish whether it is right hand threaded or left?

Thanks

Ben

[john s 2]

Ben. The propellers that i use M4 are only clockwize threaded Both lh and rh have the same  thread.Use of a locknut and possibly a
thread lock compound will keep prop secure.Regards John

[Ben Tickle]

Hi,

All of my props spin to the left so which thread would i need?

Thanks

Ben

[john s 2]

Hello again Ben.The actual thread inside a prop can be of diffrent sizes. Nowadays the popular size is 4mm.Also 2mm and 5mm for
bigger props.Before this there was various Imperial sizes such as 4ba etc. If you have a fastener shop near you you could pop in
Im sure that they could id for you.It is possible to count threads an measure diameter.Possibly there is a model shop near you who
could id your thread? John.

[Ben Tickle]

Hi,

I have got a standard m4 prop shaft and i am wanting a suitable prop for it, could anyone please help?

Thanks

Ben

[hollowhornbear]

then that's what you want an M4 prop. Diameter/ rotation direction have no relevence.

[nick_75au]

Hi,

I have got a standard m4 prop shaft and i am wanting a suitable prop for it, could anyone please help?

Thanks

Ben

Asking that is like going to a lingerie shop to buy a bra for a girlfrend and not knowing her cup size   or what colour she likes.

Raboesch are all M4 with the exception of the largest 75 mm? and up props, most of the Graupner props are also M4

Cheers
Nick

[Ben Tickle]

Thats what is confusing me, the rh and lh bit, its m4 and the prop needs to be 30mm, so i take it tht it dont matter what thread it is?

Thanks

Ben

[nick_75au]

M4 thread is always a RH thread, but the props can be LH or RH Pitch, single screw boat wont matter which direction, the electric motor "may" prefer a direction for forward running.


Nick

[gribeauval]

Thats what is confusing me, the rh and lh bit, its m4 and the prop needs to be 30mm, so i take it tht it dont matter what thread it is?

Thanks

Ben

Ben forget about left and right hand threads, that's what is confusing you. Nearly all propshafts are standard M4 or M5 threads. What you need to know is in what direction is the prop spinning.

In the UK props are referred to as left handed when they spin anticlockwise when viewed from the stern looking towards the bow and right handed when they spin clockwise when viewed from the stern. So what you want is either an M4 30mm left or right handed prop depending upon the direction that your motor spins.

Mike

[RaaArtyGunner]

Thats what is confusing me, the rh and lh bit, its m4 and the prop needs to be 30mm, so i take it tht it dont matter what thread it is?

Thanks

Ben

Ben,

If I have got it right, what is being said is, it doesn't matter whether the M4 30mm prop you buy is an, M4 left or M4 right handed prop they will both fit onto your M4 prop shaft.

You then have to decide if you want/need your prop turning left or right, as has been mentioned.

[modelboatbits]

Hi, Ben

If your props turn to the left ( anti-clockwise ) then you require a RH Prop M4 thread

See photo below


Thanks  Steve

[Lord Bungle]

Hi Ben don't worry about the thread :) stick a locking nut next to the prop and a squirt of locktite or something similar at it won't come undone. as for the pitch don't worry about that to much either, you can allways reverse the direction of the motor if you discover it runs backwards on a trial run

[Pat Matthews]

And just for fun, note that the traditional definition for prop handedness is reversed in the States... makes ordering fun when you don't know which system is being used!

And we flip our light switches UP for on, too...

[RaaArtyGunner]

And just for fun, note that the traditional definition for prop handedness is reversed in the States... makes ordering fun when you don't know which system is being used!

And we flip our light switches UP for on, too...

Yes and you also drive on the wrong side of the road       

[Roadrunner]

Hi Ben don't worry about the thread :) stick a locking nut next to the prop and a squirt of locktite or something similar at it won't come undone. as for the pitch don't worry about that to much either, you can allways reverse the direction of the motor if you discover it runs backwards on a trial run

bad bad advice, it takes 2 mins to make an effort to find the right prop....

Ben Im gonna link you props that will do the job, take your pick. don't just use a 5m threaded prop on an m4 shaft and hope the thread lock holds, it won't !

try these.

http://www.cornwallmodelboats.co.uk/acatalog/R160-M4.html  brass 3 blade (top two on page m4 30mm rh or lh)

http://www.cornwallmodelboats.co.uk/acatalog/plasticm4.html plastic 3 blade (top two on page m4 30mm lh or rh)

don't worry if you pick lh or rh, this will just dictate the which way you wire the motor to turn clock wise or anti clock wise, in a single shaft vessel, only time to concider lh rh props is when building twin, tripple, or quad shaft driven boats 

[Netleyned]

Loctite will probably  test OK at the lakeside

Middle of lake 


Ned

[Lord Bungle]

bad bad advice, it takes 2 mins to make an effort to find the right prop....

Ben Im gonna link you props that will do the job, take your pick. don't just use a 5m threaded prop on an m4 shaft and hope the thread lock holds, it won't !

try these.

http://www.cornwallmodelboats.co.uk/acatalog/R160-M4.html  brass 3 blade (top two on page m4 30mm rh or lh)

http://www.cornwallmodelboats.co.uk/acatalog/plasticm4.html plastic 3 blade (top two on page m4 30mm lh or rh)

don't worry if you pick lh or rh, this will just dictate the which way you wire the motor to turn clock wise or anti clock wise, in a single shaft vessel, only time to concider lh rh props is when building twin, tripple, or quad shaft driven boats 

oppps my boo boo thats what happens when typing 1/2 a sleep  meant to say screw,

[Martin (Admin)]

I've used my nail varnish in the past!   
Sets solid but will break free only when forced.

[RaaArtyGunner]

I've used my nail varnish in the past!   
Sets solid but will break free only when forced.

And the best colour is.......................

[essex2visuvesi]

superglue makes an effective thread lock too