Rumors of Future Releases

[sclui56]

Sucker is too fast https://youtu.be/SDAUYGq6-ac?si=k78S2kJ-gDf3ccJx

[SoCalBobS]

large sprocket and short track length = faster speed from equal rpm. Envision the track as another gear, and the gear ratio will affect the end speed.

[Rubicon99]

The size of the sprockets do not matter. Here is the equations for calculating the 1/16 scale tank speed.

1. motor rpm x gearbox ratio = track rpm
2. track rpm x track length (inches) = actual RC tank speed in in/min

When you use a larger diameter sprocket, you need to increase the track length to go around it. A longer track means faster tank speed. It is simple mathematics. Please, let me know how my equations were wrong if you are not convinced.

On a wheeled RC car, we all can see and understand how a larger diameter set of wheels run faster. Same principle.

You just agreed with my point. Larger sprocket equals fast track speeds and thus FASTER tank. What more is there to discuss.

[keilau]

With all do respect we are not talking scale speed on a modified tank we are talking flat out unrealistic toy fun speed of an off the shelf HL tank. That said the size of the sprockets absolutely does matter. Repeated real world side by side testing proves it does. I swap sprocket and tracks types often on tanks. Yes many tanks have sprockets with similar backspacing to allow this. Example is running an M41 sprocket on an Abrams (with M41 tracks) and running Abrams sprocket on an M41 (with Abrams tracks).

The M41 is substantial faster with Abrams sprocket then with it stock sprockets. The Abrams when used with a M41 sprocket is much slower. These has been demonstrated in front of numerous people some with mechanical engineering backgrounds and they agree the sprockets make a substantial difference.

Another example is the stock Panzer vs stock Sherman top toy speeds. Both use the same gearbox, battery and are about the same weight yet consistently the Panzer is faster. The Panzer is faster because of it sprockets size. This is a problem we often have to contend with at all three Ca clubs during battle days and why we require tanks to be driven in low power mode.

Simple undeniable fact is the sprockets size changes the overall final drive ratio (something your formula does not account for nor does it take into account torque and rolling resistance) and this effects the maximum speed that can be obtained given a stock metal HL gearboxes running a stock voltage battery.

Sure with better motors, gearboxes, tracks and batteries higher speeds can be obtained but that is a discussion for its own thread.

The size of the sprockets do not matter. Here is the equations for calculating the 1/16 scale tank speed.

1. motor rpm x gearbox ratio = track rpm
2. track rpm x track length (inches) = actual RC tank speed in in/min

When you use a larger diameter sprocket, you need to increase the track length to go around it. A longer track means faster tank speed. It is simple mathematics. Please, let me know how my equations were wrong if you are not convinced.

On a wheeled RC car, we all can see and understand how a larger diameter set of wheels run faster. Same principle.

[Rubicon99]

The size of the sprockets do not matter. Here is the equations for calculating the scale speed.

1. motor rpm x gearbox ratio = track rpm
2. track rpm x track length (inches) x 16 = scale speed in in/min
3. convert in/min to miles per hour (or kilometers per hour)

The 380 or 390 motor rotational speed are all over the places. I highly recommend using matched pair for any RC tank.

With all do respect we are not talking scale speed on a modified tank we are talking flat out unrealistic toy fun speed of an off the shelf HL tank. That said the size of the sprockets absolutely does matter. Repeated real world side by side testing proves it does. I swap sprocket and tracks types often on tanks. Yes many tanks have sprockets with similar backspacing to allow this. Example is running an M41 sprocket on an Abrams (with M41 tracks) and running Abrams sprocket on an M41 (with Abrams tracks).

The M41 is substantial faster with Abrams sprocket then with it stock sprockets. The Abrams when used with a M41 sprocket is much slower. These has been demonstrated in front of numerous people some with mechanical engineering backgrounds and they agree the sprockets make a substantial difference.

Another example is the stock Panzer vs stock Sherman top toy speeds. Both use the same gearbox, battery and are about the same weight yet consistently the Panzer is faster. The Panzer is faster because of it sprockets size. This is a problem we often have to contend with at all three Ca clubs during battle days and why we require tanks to be driven in low power mode.

Simple undeniable fact is the sprockets size changes the overall final drive ratio (something your formula does not account for nor does it take into account torque and rolling resistance) and this effects the maximum speed that can be obtained given a stock metal HL gearboxes running a stock voltage battery.

Sure with better motors, gearboxes, tracks and batteries higher speeds can be obtained but that is a discussion for its own thread.

[keilau]

I imagine the KV geometry helps, with a large sprocket and a short track length. I'd love to see a "Hyper-KV"!

The size of the sprockets do not matter. Here is the equations for calculating the scale speed.

1. motor rpm x gearbox ratio = track rpm
2. track rpm x track length (inches) x 16 = scale speed in in/min
3. convert in/min to miles per hour (or kilometers per hour)

The 380 or 390 motor rotational speed are all over the places. I highly recommend using matched pair for any RC tank.

[SoCalBobS]

I imagine the KV geometry helps, with a large sprocket and a short track length. I'd love to see a "Hyper-KV"!

[Rubicon99]

The stock Heng Long RTR tanks have 380 motors running at 14000 to 16000 rpm and a gearbox of 1:39 gear ratio. Typical scale speed are 23 to 26 mph dependent on the motor rpm and the track length. Larger tanks run slightly faster due to the longer tracks.

My fastest Heng Long tank is the German Leopard 2A6 with the Heng Xin ball bearing gearbox and Mxfans 390 motors. It measures a scale speed of 46 mph.

Going to hijack the thread for a post or two. If people want a thread to discuss this topic in more depth I will start one.

Speed depends on many factors. Gear ratio, motor size and brand, final drive sprocket diameter, type/design of tracks, surface being driven on, not being to light weight and most importantly battery voltage.

A stock HL metal upgraded tank lets say a Merkava for example. By simply jacking up the voltage to 9.6 or higher will easily outrun a similar HL Merkava with 390 motors and bearing gearboxes running on 7.4 volts.

The fastest HL stock tank is not any of the plastic versions they are all to light weight and do not transfer power to the ground well. As crazy as it may seem, consistently the KV1 in what Motion RC calls "professional" version (metal upgrades) is the fastest. I am no big KV fan, but given making tanks stupidly fast is something I have a reputation for, the KV came as a surprise and just by happenstance had the best mix of the above list.

Now add 390 motors and a 9.6+ volt battery and you have a ridiculously fast tank that will outrun almost anything not substantial upgraded. Want it even faster drop in a high speed "dual current" drive and run it at 9.6+ volts and it will give a 1/10 rc off road truck a run for it's money. Just be ready folks to break stuff while laughing your back end off doing so.

[keilau]

Yeah, but if you call 'em on it they'll just say they meant ready to run, or some other cheesy excuse.

But that does raise a question, I wonder what the fastest stock tank is? I mean right out of the box. I imagine it's an all plastic tank. It's probably one I would never expect, like the pantiger.

The stock Heng Long RTR tanks have 380 motors running at 14000 to 16000 rpm and a gearbox of 1:39 gear ratio. Typical scale speed are 23 to 26 mph dependent on the motor rpm and the track length. Larger tanks run slightly faster due to the longer tracks.

My fastest Heng Long tank is the German Leopard 2A6 with the Heng Xin ball bearing gearbox and Mxfans 390 motors. It measures a scale speed of 46 mph.

[Max-U52]

Yeah, but if you call 'em on it they'll just say they meant ready to run, or some other cheesy excuse.

But that does raise a question, I wonder what the fastest stock tank is? I mean right out of the box. I imagine it's an all plastic tank. It's probably one I would never expect, like the pantiger.

[Rubicon99]

Why you can't believe any Chinese ad claims. "Fastest" tank on the market. I think not! Guess they have not seen a Tamiya Abrams in action.

[Rubicon99]

See ad in next post.

[keilau]

Initial report from across the pond says the scale is close to where it should be.

No picture of the Coolbank Stuart inside yet! Initial report looks good.

BangGood had started shipping by standard shipping with tracking, 20-30 days shipping time.

[cmdrcody]

Package has been sterilized?

Don't want any more virus' from China!

[tank_me]

Initial report from across the pond says the scale is close to where it should be.

[sclui56]

Just happened to come across this - landed in UK https://www.rctankwarfare.co.uk/foru...ic.php?t=36026

So it's real!

[MrChef]

Package has been sterilized and shipped out.

Package has been sterilized?

[keilau]

My order for a Coolbank Model M5A0 Stuart from BangGood.com was shipped on 5/24/2024:

• 2024-05-25 23:00:39
  In transit
  Carrier received.
• 2024-05-24 21:08:04
  Shipped
  Package has been sterilized and shipped out.
• 2024-05-24 04:42:
  Our warehouse has started packing your items.
• 2024-05-13 11:06:10
  Order submit.

Expected delivery date is June 13-23. It sounds like BangGood's express shipping. Excellent deal for US$126 plus tax.

[Max-U52]

Just received this from banggood

I got the same email, with the same date. Click on "track your order" and you'll see a USPS tracking number but a google search gets no joy. However, I put it in 17track and got a page that said they're awaiting delivery of the item. I'm pretty sure it won't show up on usps tracking until right before or right after it goes through customs.

[keilau]

I received mine yesterday from AliExpress 3 weeks shipping time…. All in all I like it my major complaint is no translation for manual….. lots of possibilities wish I had a 1/16 Stuart model to measure it with to see if it is scale

Would you tell us which AliExpress seller did you buy from and when did you place your order? You are the first recipient of the Coolbank Stuart. Any take it out of box and first impressions of running the tank will be very welcome.