Tyne class Life Boat

Good evening all,

So I have just received my hull and plan set for this my first sortie into rc modelling. Now as I plan to run this kit primarily in salt water (as I live on the shores of a tidal estuary) I'm extremely paranoid about making the hull water tight and therefore corrosion tight. To that point I've seen on the site guys talking about P38 and P39 fillers. Can someone tell me why I'd choose one over another. Or indeed use something else all together.
Cheers, Murphy
I'm hoping my boat has a more fortunate life than this old girl which washed up several years ago after a big storm

Hi Murphy

I'm not aware of a P39 filler. P38 is a two part epoxy filler. It doesn't have any real strength, but does adhere well to GF and wood hulls. If using on plastic hulls, you need to abrade the area to help it to stick.
It sands easily to a smooth surface.
If I need strength as well as filling, then I use P40 which contains chopped fibre glass strands. Same restrictions with plastic hulls. I would use this to seal around propshafts etc.

Hope this helps.

Barrie

Thanks Barrie,
Yep I'm not aware of a P39 filler either I meant P40 I'm assuming P40 is also fairly easy to sand also??
Big shout out to David who is feverishly trying to send the magazine article relating to this build to me for guidance
Cheers, Murphy

Murphy

NO!!!! P40 is not very easy to sand. It is full of spiky bits of glass strands. I do my best to smooth it out, but its not easy to do in the situations where I use it. I usually use it inside the hull to support the prop shaft and rudder tube.



I tape up the opening on the out side of the hull to ensure a smooth finish there, and finish it off with P38.

Barrie

So the hull and plan set finally arrived. I masked the vac form seam as a guide to cut the hull down[url=https://servimg.com/view/20282207/3][img]https://i.servimg.com/u/f96/20/28/22/07/20201111.jp

Here is the hull after I cut and sanded it. I'm pretty happy with it there may be a slight difference between the port and starboard heights but it may be like 0.5 to 1.5 mm. Would this cause any concerns as the build progresses??? Looking at the plans the deck sits flush onto of the hull anyway is this correct????[/url]
[url=https://servimg.com/view/20282207/11]

hi murphy,

you can see the curve in the picture of the hull bulkheads i cut out from the drawing you should have. and the photo of them all cut out.


david

Thanks David,

I went back over the photos last night and noticed them. My thinking is to run four main bearers fore and aft of both the main and secondary cabins only as I don't want to clutter the spaces up down the track when I need to inspect and work on the running gear and charge and replace batteries.

What size motors, drive shafts and props are you running on your lifeboat as i suppose this needs to be purchased before the deck is fitted, filled and sanded???

Cheers, Murphy

hi murphy,

when i built mine in 2009 i put 2 380 mfa motors in as i am not into speed i like to just potter around  it lasts about 20 minutes on lead acid battery 12 v. if you want speed then you can use 540 mfa brushed motors which i think is recommended in build blog. you can now get brushless motors which  are fast on lipo batterys, i whish there were more about when i built mine . sorry i cant be precise as it is what you want out of it. if i was building today i would go brushless. for props i use 35 mm m4 brass props and brass shafts which you can size up from plans. as for greasing the inside the jury out on this i have allways put grease inside this stops any water ingress, but you will find some one will come on and say this is wrong so i will leave that there my opinion only lol. you will find you have to adapt ways of making supports for motors our get them ready made. hope you have made sense of this as i like to show some one how to do things.

 david

Thanks David,
I feel ridiculously out of my depth in relation to the rc side of this build. Is there a chance I could work on the build  hull up and then go back and install the rc stuff via the two cabin openings risking a reduced ability for access. Or should i put on my big pants and deal with the motor / rudder stuff now in a more systematic way.
Please help anyone
Murphy

hi murphy ,

you should be able to access the inside with deck on, but i would do the rudder and servo first as it is furthest back and can be fiddle but is accessible. the motors are the main problem as i had to make extra holes to gain better access i will try to find the way i did it on my boat but they are all packed away for winter so will try to get it out. as any one will tell you better to start while you have full access not what you want to hear sorry but you will get there. 


david

Thanks David,

Just been looking at brushless motor on the Cornwell model boat supplies but not really sure what I'm looking for as there is so many to choose from. I'm thinking of a m4 prop shaft but that's about all I know at this point. I'm not overly concerned with huge speed as it's not a race boat but having said that i want the motor output to allow for realistic scale performance. Any thoughts and or advice on brands/models welcome and needed. In the mean time I'll start on the bearers for the deck.

By the way David, grease for water proofing prop shaft and rudder housings seemed to be universally accepted, Cheers mate.

Murphy

Murphy

Some points about brushless motors - if you are not aware.
Most of the brushless ESCs are designed for aircraft, and are therefore forward only. You don't necessarily require a water cooled one, but you do need reverse
If you want two motors, you need two ESCs - you can't link two motors to one ESC as you can with brushed.
I'm no expert on these motors, but I think they do have a use.  I'm about to use one in my current build. David used two 380 brushed motors in his Tyne, I think a suitable replacement would be a 2836 1000Kv brushless, and a 30 amp ESC should be adequate.
Take a look at HobbyKing and Banggood.
If you are only using one motor, then I'm not sure what to suggest.

You M4 shaft should be perfectly OK.

Barrie

hi barrie,

 thanks for that info, i am not into brushless myself so not sure what to advise. i no they seem faster which i am not, so stick with brushed a lot easey to use. i use a double esc from china which works 2 motors together great in my tyne.


david


this is the double esc i use on ebay for £9.00 and upwards 

• 
  - apply Price filter
  
  
  
• 
  Over £11.00- apply Price filter
  
  
  


• 
  
  
  
  
  
  
  
  

  Double Way 320A ESC Brush Motor Speed Controller And Fan For RC Car Boat Model

  
  
  
  
  
  Brand new
  [size=24]£12.42
  20% off with coupon. Max £50 off20% off with coupon. Max £50 off
  Buy it now
  [/size]
  
  

David

I use similar ESCs for my brushed models, I've also found a similarly priced 30 amp one for use with brushless. If you get the spec right, then brushless are also good for pootling around the lake. They are not just for the speed merchants. I put one in the cabin cruiser I built last year. If anything it was a bit slower than I expected, a similar combo is going into my new build.
I've used up most of my stock of brushed motors so decided to give brushless another try.

Barrie

hi murphy,
i have used this firm for 20 years they are S.H.G. very good prices but now only on ebay. i only clicked on 8 inch as not sure of size you want


david

Free postage Opens image gallery

 Save this seller
Contact seller
Visit Shop
See other items


Registered as a business seller

Model Boat Propeller Shaft Assembly M4 - 3" to 15" Full Range


New

- Select -3"4"5"6"7"8"9"10"11"12"13"14"15"Pk of 10 M4 Propshaft Locknuts

More than 10 available / 731 sold


[size=24]£10.00[/size]



100% buyer satisfaction
154 watchers
Limited quantity remaining


Collect 2 Nectar points
Redeem your points | Conditions


Free Economy Delivery | See details

 
Item location:
Stafford, United Kingdom



 
Posts to:
Worldwide See exclusions


Estimated between Sat. 12 Dec. and Mon. 14 Dec.  


    

 Get more time to pay.  See payment information

14 days refund, buyer pays return postage |  See details

If you want to see a good selection of RC gear (and much more) have a look at the Hobbyking website.  You will find a good selection of motors, both brushed and brushless and the appropriate speed controllers.  I have been using one of their car ESC's in a boat as they have forward and reverse plus they are air cooled.  I think that the website is - www.hobbyking.com.

Derek.