boatman's 1/72 HMS Tiger C20 build

[Tworrs]

Chris, this may be a totally stupid suggestion, however if you were to lengthen the rudder, not depth but length toward the rear, would that perhaps extend the rudder sufficiently far into the wash of the props, when turning, to give you better steering?
Looking at your build I think that extending the rudder rearward would make it protrude out beyond the stern of the ship, which may not be acceptable.
Just me thinking outside the box.
ATB
Garry

[Ian M]

Quite a haul there Chris. I hope you luck turns soon.

If It was me I would have started with a fuse to each motor to see if there was one of those kicking off.
Swapped out the two "odd" motors to the ones that you would rather of had. Or more likely fitted 4 new low speed high torque motors with matched speed controllers.
If the ships speed was still an issue I would then have a look at the props. They do look to small. Even going from 33mm to 45mm will be a help. (Maybe going from a five bladed to a more modern ships six bladed high speed prop will be better still).
Steering wise to get a boat that length to turn quick you are probably going to have to have a not to scale solution. Either a huge rudder that will cut into the prop wash. (will need a high torque servo) or install two rudders that will cut into the wash of two props. Eventually with a mix on the radio that for example with a turn to port the rudder will turn to port, the the port motors slow and the starboard speed up assisting the turn. Maybe add the bow thruster into the mix and turn on a sixpence.

[Mickc1440]

Good luck with these Chris

[Jim R]

Fingers crossed Chris.

[boatman]

Hope this goes to plan Chris ,looks to be a lot of £ there .

HI John yes there is a lot £'s there an today if i can get in the mood as my mojo is now very low an got a bloomin cold like jen has so dont feel to good an where i live now i cant get the help from my neibour that i had when building my other ships as he used to help me carry the model to an from the test tank an i dont like to ask jen as her foot is now hurting her so yes today there is now got to be more lots of £'s to buy x4 new bigger 45 mm props an this is the last throw of the dice im afraid as when ive bought an paid for them new props im then not goin to throw any more money into the model as ive got some new ideas to try but im now on me last legs an if they dont work well tiger will be just a static model to put in shows an such
chrisb

[boatman]

Chris, this may be a totally stupid suggestion, however if you were to lengthen the rudder, not depth but length toward the rear, would that perhaps extend the rudder sufficiently far into the wash of the props, when turning, to give you better steering?
Looking at your build I think that extending the rudder rearward would make it protrude out beyond the stern of the ship, which may not be acceptable.
Just me thinking outside the box.
ATB
Garry

AN HI Garry no it not a stupid idea as ive been thinkin along the same lines but my idea may not look very nice but im thinkin of cuttin off the back part where the rudder is an modifyin it to take 2 rudders an yes make them bigger like you say an if i can do it fit two rudders behind the outer props but they will be a very weird shape so they can turn in towards the hull an these new props at 45mm will nearly touch the hull so its goin to be a close run in an i may have to drill out all 4 prop shafts an A FRAMES an reset them all to take them monster motors as well so a lot of thought goin to happen an may take another couple of yrs before i get to try her out again an that blasted wind always gets up at norwich pond an sheringham but i cant do anything about that Aaaaaaccccchh
ATB AN PS EVEN MY BLOOMIN P/C IS AGAINST ME NOW AS I HAVE NOW TROUBLE POSTIN
chrisb

[boatman]

Quite a haul there Chris. I hope you luck turns soon.

If It was me I would have started with a fuse to each motor to see if there was one of those kicking off.
Swapped out the two "odd" motors to the ones that you would rather of had. Or more likely fitted 4 new low speed high torque motors with matched speed controllers.
If the ships speed was still an issue I would then have a look at the props. They do look to small. Even going from 33mm to 45mm will be a help. (Maybe going from a five bladed to a more modern ships six bladed high speed prop will be better still).
Steering wise to get a boat that length to turn quick you are probably going to have to have a not to scale solution. Either a huge rudder that will cut into the prop wash. (will need a high torque servo) or install two rudders that will cut into the wash of two props. Eventually with a mix on the radio that for example with a turn to port the rudder will turn to port, the the port motors slow and the starboard speed up assisting the turn. Maybe add the bow thruster into the mix and turn on a sixpence.

AN HI Ian yes so do i but dont think its gonna happen but will give it the good ole college try
1. now regards this fusein bussiness thats cured now as it one of those ole grupner motors causein that so i can tick that off the list
2.an yes im now goin to fit high touge motors but they are heavy an may make her sit lower in the water so more hull drag ? but wont know till i try her in the pond
3. yes today im hopein to order them x4 45mm props as cant go any bigger or they will hit the hull
4.AN them new fancy 6 bladed scimitar bladed props are to exspensive so i will have to stick with the normal 5 bladed props
5.yes Ian im thinkin of alterin the hull to take two rudders at the back an maybe two rudders on the outer props so all in 4 rudder like i did on my nimitz carrier but goin to be a big job an take quite a bit of work
6. an i treid a mixer on my nimitz carrier so that the props slow down on one side an the other side props speed up but it dint make any difference as remember im workin in the same medium water as the real ship an the real ship has maybe 12ft props so they will make a difference but as they say you can scale the model ship but not the water so no go on that but thanks for your intrest an info
7.AN regards the bow thruster Ian well it will only have effect when the model is still so it will push water left an right but when the ship is movin in hull speed the water will just stream past the outer ports so not good for steerin the bow if you see what i mean sir
chrisb

[boatman]

AN Ian if you note here is where ive fitted 4 rudders to my NIMITZ carrier an these turned her lovely an she was bigger than tiger but the hull shape on tiger is rounded so that will make it more difficult to fit in more rudders if you see what i mean
chrisb

[scottie3158]

Chris,
Sorry to hear the tales of woe continue, but you being you will overcome and sort it.

[boatman]

Chris,
Sorry to hear the tales of woe continue, but you being you will overcome and sort it.

HI Scotty nice to hear from you sir an well just me bein me wont cure the probs if i cant get the right gear as i have been on a boat site to get them 5 bladed props but its so complex i cant make out head nor tale of it an neither how much these props are as i want 5 bladed 4 mm thread an diamiter 45mm an even treid to send them a email but my p/c wont send so im waiting for them to phone up
an pic of props x4 below

[JR]

Quite a haul there Chris. I hope you luck turns soon.

If It was me I would have started with a fuse to each motor to see if there was one of those kicking off.
Swapped out the two "odd" motors to the ones that you would rather of had. Or more likely fitted 4 new low speed high torque motors with matched speed controllers.
If the ships speed was still an issue I would then have a look at the props. They do look to small. Even going from 33mm to 45mm will be a help. (Maybe going from a five bladed to a more modern ships six bladed high speed prop will be better still).
Steering wise to get a boat that length to turn quick you are probably going to have to have a not to scale solution. Either a huge rudder that will cut into the prop wash. (will need a high torque servo) or install two rudders that will cut into the wash of two props. Eventually with a mix on the radio that for example with a turn to port the rudder will turn to port, the the port motors slow and the starboard speed up assisting the turn. Maybe add the bow thruster into the mix and turn on a sixpence.

Ian , I'd have set fire to it by now

[boatman]

Ian , I'd have set fire to it by now

yes John an give her a vikein furneral lol but im not givin up just yet gonna fit some bigger props on her an try that as that may have been the probs all along as thats the trouble with a workin model you just dont know what its goin to take to get it all right an i think ive been veryl lucky with all my other ships that i got them all right but as they say there is always one that will cause trouble an it seems like its this one lol
chrisb

[Jim R]

..... gonna fit some bigger props on her an try that as that may have been the probs all along

Lets hope your right :smiling:

[boatman]

Lets hope your right :smiling:

yes Jim well it seems that it gonna be complex as on model boat mayhem ive got several guys all sayin something different about what props to spend a 100 quid or more on as it seems that the ones i was goin for have not got enough thrust an are not coarse on the prop pitch so i think i'll leave it a while an find out more info before i buy as these props are so exspensive x 4
cheers sir chrisb

[Ian M]

yes Jim well it seems that it gonna be complex as on model boat mayhem ive got several guys all sayin something different about what props to spend a 100 quid or more on as it seems that the ones i was goin for have not got enough thrust an are not coarse on the prop pitch so i think i'll leave it a while an find out more info before i buy as these props are so exspensive x 4
cheers sir chrisb

I was wondering why the guys that have R/C boat shops in England couldn't be a little more helpful. 4 x 45mm would get my chap o er here out the chair and doing the mathematicals!