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[frogman3]

HI ALL just askin for some advise here as tiger sailed ok an a good trim an very stable but the old motors i have fitted in her need to come out as they keep blowin 40 amp fuses an i was tryin to save on dosh but im not goin to worry now so can anybody direct me to some good 7v to 15v brushed  motors as i need some powerfull motors as tiger is really heavy an its takin a lot of boost to get her movin ?
so can anybody help me ?
chrisb

[frogman3]

Hi Chris,




This is the part of modelling I enjoy, problem solving, I know you will get there in the end. 


Pictures look good

HI Dave well you may enjoy problem solvin but im at my wits end as ive changded the ESC an the motors about 5 times because of these probs but now ive bought some good esc all the problem is now is which motors to buy as at the moment i havnt got a clue but 7 v through to 15v there about if i can get 4 motors as yesterday was a good day to see her sail but not when the fuses blew after only a few mins sailin an i hate havin to take the ship apart like i did yesterday an what with the heat of the day i was not enjoyin myself an was shattered when jen an i was shattered when we got home an i left unloading tiger till today
chrisb

[davem99]

We need a little more info please regarding tiger (type of vessel, length, breadth, weight. No. of props and pitch/size). What speed controller(s) are you using?
Without knowing about your tiger it is difficult to give any advice.
davem99.

[Martin (Admin)]

See: https://www.modelboatmayhem.co.uk/forum/index.php/topic,63106.0.html

[JohnG]

Lovely to see her. thanks for sharing. sorry to hear of the motor/power frustrations - hope you solve it.   (on the bright side, at least the fuses are doing what they're supposed to...!)
she looks really impressive on the water - the clean detailing is super to see.  - do the signal flags spell out a message?  hope i see her in person some day!
john g

[frogman3]

Lovely to see her. thanks for sharing. sorry to hear of the motor/power frustrations - hope you solve it.   (on the bright side, at least the fuses are doing what they're supposed to...!)
she looks really impressive on the water - the clean detailing is super to see.  - do the signal flags spell out a message?  hope i see her in person some day!
john g

HI JohnG
GLAD you like her yes she does look nice on the wet stuff an yes im only just now thinking about the motors but there is no hurry a yes the fuses were a little too good at their job but better than any damage in the ESC 's or such an yes if i rember rightly one line spells out tiger an the other the ships call sign if i have them right that is an yes hope you do see her in the flesh so to speak
ATB
Chrisb

[Shipmate60]

What motors were in her Chris?


Bob

[tonyH]

This is an early pic on the thread....may have been changed?

[canabus]

The motors look like 380's !!!


540 65 turn rock crawler motors on 12 volts about 11,000 rpm (free running) would be the maximum rpm of 30mm 5 blade props and 35mm props 10,000 rpm.


Canabus

[Rob47]

Hi Chris, bit of a downer day for you, especially as I had a brilliant day at Bournville Navy Day.  Reworked Bristol was absolutely running spot on and lovely weather and clear flat water. .  50 ft you must be near scale turning circle for that.
Still good images from the day and better next time I am sure.


Bob

[Andyn]

Someone pass the microscope so I can see that motor

[frogman3]

HI Bob yes pretty fed up on the big day as fuses blown an just took the motors over my brothers as he is good at eletrics an he found
 no.4 motor is faulty so im goin to wings an wheels at the end of this month an will buy 4 brand new motors to fit in her an hope that will cure the prob an the reason i think it took so long to turn was she never got up to speed up so the rudder dint bite  an love your bristolan glad you had a nice day
atb
chrisb an jen

[frogman3]

What motors were in her Chris?


Bob

SORRY GUYS have been out now the motors have chachged about 4 time but the motors i ended up sailing her were nearest to the rudder was 2 x johnsons  cant tell anymore as no details came with them  an the bigger motors are graupner 600 speed motors an my brother tested them tonight an he says no. 4 is faulty an may be the cause of the fusein but many thanks guys for you input all but im thinkin of goin to wings an wheels at end of the month an buyin 4 bbrand new motors to sort it
cheers all
chrisb

[Martin (Admin)]

 
Try four of these Chris! 

775 3500-9000RPM Large Torque High Speed Motor Gear Ball Bearings- DC12V-36V

eBay item number:404219043582
eBay item number:394369188645
Cheap enough at £9 quid.

[frogman3]

HI Martin i think i did get two of these motors  an the guys on here said they are to much current drain so i took them back to the shop an im goin to replace all 4 motors with the all the same as thats been my trouble mixin motors an im hopein to get 4 motors the size an voltage an shaft size at wings an wheels at end of month but many thanks for your help Sir
ATB
chrisb

[Martin (Admin)]

I'll see you there!   

[frogman3]

I'll see you there!   



OK Martin be nice to see you Sir
chrisb

[tonyH]

Or 4 of these at under a tenner each. 4800 revs, decent torque and low power drain.  https://www.componentshop.co.uk/mabuchi-555-dc-motor.html.html
I've a single one in a 12lb trawler with a 3 inch prop and it's got good pull from a standing start with a soft start ESC.

[frogman3]

thanks Tony i'll have a think   on them if i cant get what i want at w/wshow
cheers
chrisb

[Andyn]

For my 2p, I’d definitely go with 555 motors. I’ve had them in boats in the past drawing just a couple of amps on full bore

[Shipmate60]

Yes 555's all the way.


Bob

[HMS Invisible]

Would those who advised fogman3 to use a 555 motor also suggest a 555 if the same prop was on a 1/72 Flower Class corvette or would there be a more suitable alternative for a flower class in 1/72?

[NickelBelter]

Would those who advised fogman3 to use a 555 motor also suggest a 555 if the same prop was on a 1/72 Flower Class corvette or would there be a more suitable alternative for a flower class in 1/72?

Yes, you size the motor to the prop not the hull.  A 555 would do nicely to turn the 30mm prop on a Flower, but you might go up to an 8.4 or 9v pack for best performance.

[HMS Invisible]

Yes, you size the motor to the prop not the hull.  A 555 would do nicely to turn the 30mm prop on a Flower, but you might go up to an 8.4 or 9v pack for best performance.

Can anyone state a logical counter argument to NickelBelter's?

frogman3 et al.
I attach an image of 555 data which can be copied and pasted. The version on sale will be the 55-turn 3255

It doesn't show the power curve which peaks at 50% of the no-load rpm. To get a picture of that:- goggle motor curves

An easy to understand graphical comparison can be made with the 600, the drill motors or 385 by referreng voltage and related tabular data, up or down, to equalise peak power on each motor. I suspect the drill motors were overloaded in the last iteration.

A £7 infra red tachometer tells you in a second if a motor is overloaded. If the motor is below 50% of no-load rpm, gear down or switch motor or prop.

[Shipmate60]

I know a RE 385 on 6 volts via a 30mm brass prop powers a 1/72 scale Flower Class Corvette convincingly.


Bob