Motor of choice

[frankinstint]

Hi,

I am looking for a motor which will be insanely fast and will run well on 7.2v.

I have looked at a Tamiya Super Stock Motor RZ.

The spec
-Number of turns = 23
-Usable Voltage = 7.2v
-Torque at best efficiency = 500g/cm (7.2v)
-RPM at best efficiency = 27,500rpm (7.2v)

Dose anyone know how well it work or advice me on a better motor which runs well on 7.2v? :confused:

Just to say the size of the boat is 21 inc(53.3cm).Its the same type of hull as my profile pic

And it has to be brushed

[Aerominded]

Uh,

http://www.rcgroups.com/forums/showthread.php?t=862557

:confused:

[frankinstint]

Uh,

http://www.rcgroups.com/forums/showthread.php?t=862557

:confused:

I Locked it for a good reason

[Hoghappy]

Do tell!

Capt. Crash

[frankinstint]

Do tell!



Because everyone went to your thread and i want to edit the first post but it wouldn't let me so thats why I started a new thread.

But nice boats :)

[toesup]

I am looking for a motor which will be insanely fast and will run well on 7.2v.

I have looked at a Tamiya Super Stock Motor RZ.

Dose anyone know how well it work or advice me on a better motor which runs well on 7.2v?

I have no experience with the Tamiya motor you mentioned, though Tamiya are not known for their high RPM motors.

I assume you are looking for the highest RPM brushed motor you can find?. If you asked the same question on the 'Road Car' forums (or Fast Electric Boat) you may get a better answer than here.

Having run both boats and cars (and swapped motors between them) there are a couple of points i ought to mention.
There are some manufacturers that 'claim' 30,000RPM from their motors.. quite how close the quoted RPM is in the real world is a matter of some discussion.

More RPM doesnt necessarily mean more speed!. It depends on ballance of the hull, the position of the prop, the type of prop (Number of blades, blade shape, material, 'sharpness' etc), the type of batteries used... A lot of getting speed is 'experimentation' with a certain set up...

More RPM means more wear on the driveline components and therefore more maintainance... be warned!.

[frankinstint]

Do you think it will work well in a Deep V ,21 inc hull? :confused:

[Hoghappy]

sorry

[toesup]

Do you think it will work well in a Deep V ,21 inc hull? :confused:

It will probably work fine....

Though..

It depends on ballance of the hull, the position of the prop, the type of prop (Number of blades, blade shape, material, 'sharpness' etc), the type of batteries used... A lot of getting speed is 'experimentation' with a certain set up...


It depends what you are trying to achieve.. :confused:

[frankinstint]

So far

It's a little faster than a stock motor. If you're looking for "insanely fast" you may not like that one.
and

Well.. I use the TZ and RZ motors and yes, they are quick but you need to have the car geared properly for the track....

This all i got from the car forum.

[frankinstint]

It will probably work fine....

Though..


It depends what you are trying to achieve.. :confused:

Well i am trying to achive to find a "insanely fast" motor. Do you know any good motor which run on 7.2v? :)

[Kmot]

Get a Trinty D4 with a 6 turn single wind armature.

[retoabcr]

Kmot is right on d4-6turn.

[boat_builder]

Kmot is right for an "insanely" fast brushed motor. The D4 motors are really good. I have a couple of Orions "Revolution" Modifieds that are a 7 or 8 turn and in a 1/10 RC10B4 buggy they make it wheelie on command. They are very powerful but also very power hungry. I didn't know that brushed motors could throw out such performance until I tested them. Wow :eek: !!

[frankinstint]

Get a Trinty D4 with a 6 turn single wind armature.

Do you know how long it will run off 7.2v?

and where do you buy it?

[frankinstint]

and is it Brushed? :)

[toesup]

and is it Brushed?

Kmot is right for an "insanely" fast brushed motor

and where do you buy it?

Have you enquired at your LHS?... It may be you have to order it through the internet.

[frankinstint]

I try and find it on the internert.

[nick_75au]

How long will it last ? not long, I used a generic high speed high torque (50000 rpm claimed) years ago in a home made rigger, i think it was 6 or 7 turns. I got 3 laps on a 200 foot diameter pond maybe 1 or 2 minutes on 1300 mah ni-cads. It was the fastest thing on that pond for those 2 minutes nitro included.

Regards Nick

[boat_builder]

The run time would depend on your prop, the weight of the boat, batteries, ect.ect.. I can tell you that it will be very power hungry and draw alot of current.

[toesup]

The run time would depend on your prop, the weight of the boat, batteries, ect.ect.. I can tell you that it will be very power hungry and draw alot of current.

.. and therefore get very hot and need a LOT of cooling!..

[Kmot]

frankinstint:

How long? Depends on the size of your battery capacity. And yes, it is a brushed motor.

Where to buy? Look at your local stockist and online.

Let me say something else, though.

You can't have it all. You want an "insanely fast" motor on 7.2V and you want it to last a long time while running your boat. Those criteria are mutually exclusive.

An insanely fast motor as you describe it, will consume the battery charge in short order. If you use a huge capacity battery, the motor by virtue of making so much speed and hence heat, will have a melt down.

Even running it in a short sprint type race, these are high performance motors and will require brush changes every couple of runs and a 'comm cut' every few runs as well.

I think you are inexperienced, and are dreaming about having a super fast boat that will run extended periods of time on a single battery charge and will not require any maintenance. Ain't gonna happen!

[retoabcr]

Mr. Kmot said it well.

[frankinstint]

frankinstint:

How long? Depends on the size of your battery capacity. And yes, it is a brushed motor.

Where to buy? Look at your local stockist and online.

Let me say something else, though.

You can't have it all. You want an "insanely fast" motor on 7.2V and you want it to last a long time while running your boat. Those criteria are mutually exclusive.

An insanely fast motor as you describe it, will consume the battery charge in short order. If you use a huge capacity battery, the motor by virtue of making so much speed and hence heat, will have a melt down.

Even running it in a short sprint type race, these are high performance motors and will require brush changes every couple of runs and a 'comm cut' every few runs as well.

I think you are inexperienced, and are dreaming about having a super fast boat that will run extended periods of time on a single battery charge and will not require any maintenance. Ain't gonna happen!

well you are right. I can't have it all.

Anyway, I have been thinking of what to do and desided that the best way would be to buy a reedy 19t quad mag. This motor is quite fast while hopeful keeping good battery life out on the lake. I am going to buy this motor sometime this week. :)