Novice question - props

General Discussion and Questions regarding TF72 and Ship Modelling
Post Reply
RAAFieChappie
Forum Member
Forum Member
Posts: 8
Joined: 08 Sep 2014 14:29
Fleet Base: Non Club Member
My Ship Yard: Bankert tug (Billings kit)

Novice question - props

Post by RAAFieChappie »

I'm building a Billings kit 1/50th Bankert tug which I've resurrected after lying dormant for many years (my first project). The 40mm prop has split and beyond repair (see photo). I can't seem to identify a source for a replacement nylon prop that fits the existing shaft. Can anybody suggest a source please? Should I buy a completely new prop & shaft to be safe? Hope you can help.
Attachments
Prop_2.jpg
User avatar
BsHvyCgn9
Club Member
Club Member
Posts: 2027
Joined: 30 Jan 2010 18:33
Fleet Base: Gulf Waters
My Ship Yard: USS Long Beach CGN9
USS California CGN36
USS John Paul Jones DDG53
USS Saipan LHA2
USS Shark SSN591
USS Seawolf SSN21
USS Albany CG10
Location: Adelaide

Re: Novice question - props

Post by BsHvyCgn9 »

Work out what thread it is (ie: M3 or M4) its most likely M3 hop on to GT Siteks website and use his Contact link to ask for a 40mm 3 blade Brass prop with M3 thread. The bonus is it will look way better than a nylon prop and go better in reverse too.... (those nylon props seem to go better fwd!)

Cheers Bruce
User avatar
MichaelB
Life Member
Life Member
Posts: 1167
Joined: 20 Jan 2010 12:17
Fleet Base: Sydney
My Ship Yard: HMS Cleopatra F28, HMS TARTAR F28

Re: Novice question - props

Post by MichaelB »

Or give Floataboat in Melbourne a call and get a bog standard 4 blade Raboesch prop for it. 4 blades seem to be more appropriate for a tug.
RAAFieChappie
Forum Member
Forum Member
Posts: 8
Joined: 08 Sep 2014 14:29
Fleet Base: Non Club Member
My Ship Yard: Bankert tug (Billings kit)

Re: Novice question - props

Post by RAAFieChappie »

Thanks guys. Is there a easy way to discern if the thread is M3 or M4? I've got the LH & RH sussed out and fortunately the tug is a single prop. The Bankert kit came with 2 fairly thick wooden rudders. To me they seem overly thick and prone to damage (eventually). Any suggestions? Brass sounds logical.
Attachments
Rudders.jpg
User avatar
BsHvyCgn9
Club Member
Club Member
Posts: 2027
Joined: 30 Jan 2010 18:33
Fleet Base: Gulf Waters
My Ship Yard: USS Long Beach CGN9
USS California CGN36
USS John Paul Jones DDG53
USS Saipan LHA2
USS Shark SSN591
USS Seawolf SSN21
USS Albany CG10
Location: Adelaide

Re: Novice question - props

Post by BsHvyCgn9 »

Just measure the thread on the shaft. M3 = metric 3mm so should be around 3mm across the threads. Or go to Bunnings with the Shaft and see what size nut fits.

Also how closely does(did?) the prop come to the sides of the kort nozzle? if there was a reasonable gap say 2-3mm you could get a proper 4 bladed kort prop to suit the inside diameter of the nozzle much more efficient then!

With the rudders I would taper them down a bit to an aerofoil shape if possible....

Cheers Bruce
RAAFieChappie
Forum Member
Forum Member
Posts: 8
Joined: 08 Sep 2014 14:29
Fleet Base: Non Club Member
My Ship Yard: Bankert tug (Billings kit)

Re: Novice question - props

Post by RAAFieChappie »

Thanks Bruce. I'm off to Bunnings. One last question (I think). Is it necessary to put grease on the prop & rudder shafts to stop water being ingested into the hull? Probably elementary stuff but I'm an absolute newbie.
cheers,
Paul :hlp:
User avatar
BsHvyCgn9
Club Member
Club Member
Posts: 2027
Joined: 30 Jan 2010 18:33
Fleet Base: Gulf Waters
My Ship Yard: USS Long Beach CGN9
USS California CGN36
USS John Paul Jones DDG53
USS Saipan LHA2
USS Shark SSN591
USS Seawolf SSN21
USS Albany CG10
Location: Adelaide

Re: Novice question - props

Post by BsHvyCgn9 »

Yup wack some marine grease in the shaft tube and on the rudder post. Also prevents corrosion of the bits...

Cheers Bruce
cootafleet
Club Member
Club Member
Posts: 146
Joined: 25 Feb 2010 15:56
Fleet Base: Brisbane
My Ship Yard: lcm3,flower class corvette,pt109,freelance fire support ship LONGTAN.

Re: Novice question - props

Post by cootafleet »

Korts props have squared off blade tips to fit the nozzle.
Bruce B1
Post Reply