Looking for X30 propeller

[ChrisBParticipant @chrisb29081]

hi all, I am looking to buy an X30 two blade 4mm thread plastic propellor for an on going build. I know they exist, as I already have one on another boat..however I cannot seem to find anyone who stocks or sells this particular beast, x35 and upwards, yes but not x30.

I have tried eBay, Cornwall, and several other model shops ( even Westbourne) to no avail – Hobby King won't let me on their site for some reason!

Can anyone point me towards a source of this elusive prop please, thanks.

Chris

[ChrisBParticipant @chrisb29081]

Who sells this elusive beast?

[ashley needhamParticipant @ashleyneedham69188]

Chris. Does it HAVE to be an X30? Can you use (for instance) a dog drive style prop of a small size and high pitch??

​Ashley

[Charles OatesParticipant @charlesoates31738]

Have you tried Prestwich models? They are usually excellent at racing parts.

[ChrisBParticipant @chrisb29081]

Hi Ashley, I've never tried using a dog drive, it may come to this!

Charles, thank you , tried Prestwich, no joy.

Chris

[Dodgy Geezer 1Participant @dodgygeezer1]

A pad of medium coarse sandpaper held close to an X35 prop while it is rotating seems to be indicated….

[Charles OatesParticipant @charlesoates31738]

Hi Dodgy, keeping the profile for a racing prop will be difficult with that method. I tried it once and binned the result. Any tips welcome.

[harry smith 1Participant @harrysmith1]

Hi Chris

I only use dog drives and never drop a prop into the deep, even in reverse!!!

Harry

[ashley needhamParticipant @ashleyneedham69188]

Chris. Dog drive adaptors (collars with the dog bits on) are very cheap, and in point of fact if you use a grub-screw collar to hold the prop on then you can simply use a bit of unthreaded stainless rod for the propshaft.

The collar is just there to stop the prop coming off at rest or in reverse b earing in mind that when driven the prop is pushing forward onto the dog-collar. A couple of flats filed in the shaft for grub screw security and away you go.

Model marine supplies list a Graupner Carbon Hydro prop, 4mm thread at 29mm diameter..h-g2318-29 or a -31 (31mm) or a Dragon X432/3 carbon fibre prop, 4mm shaft (hole not threaded)

​Ashley

[David Marks 2Participant @davidmarks2]

Have a look at SHG. They sell a prop, 2 blade, M4, 31mm dia. In "old money " that is 0.040" too large which means 20 thou needs to be removed from each blade tip……a simple needle file job.

David Marks

[harry smith 1Participant @harrysmith1]

Hi David

I would test the prop out first, but, would 20 thou make a big difference?

Remember to balance the prop first.

Harry

[ChrisBParticipant @chrisb29081]

Thanks for all your inputs, I think that the X30 can no longer be in production.

I will have to try the nearest equivalent, and have a closer look at the dog drive possibility.

Thanks, Chris

[ashley needhamParticipant @ashleyneedham69188]

ChrisB. To get back to my original question….does it HAVE to be an X30? and if so what sort of hull and motor/revs are you using it for?

​Contrary to popular belief/practice, one website states "X pitch for slower revving engines" and S pitch (the shallower normal pitch) for higher revving engines. After a bit of experimenting I can agree with that unless its ultimate performance you need, and on one boat, a change of X to S with a 5mm diameter increase worked wonders.

Dog drive props will all have different profiles to an X, unless you make enquiries with someone knowledgeable. I cant remember what the pitch is on an X, but you should be able to get something in this pitch at least.

Ashley

[ChrisBParticipant @chrisb29081]

Hi Ashley, thanks for that. I am building a sister boat to one I already have. (Sea Princess cruiser ) First was built in Depron, this one is balsa. I wanted to keep drive train the same for a direct comparison. Depron one flys like a stabbed rat!

I have noted the X to S plus 5 mm, and will probably go this way.

Thanks for your input.

Chris

[Andrew Martin 3Participant @andrewmartin3]

They are available and in stock, according to Cornwall Model Boats part number is R1455 http://www.cornwallmodelboats.co.uk/acatalog/robbe-propellers.html

Secondly if you contact Mantua Models in Windsor they used to stock Graupner Props in that size, seem to recall the 2303 series were X Type

[ChrisBParticipant @chrisb29081]

Thanks Andrew, I'll give them a look.

Chris

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