RC4WD 1:2 Gear Speeder for 540 Motor

[PeterV]

http://www.rccaraction.com//Media/MediaManager/540_speeder.jpg

As spotted at www.rc4wd.com. I definitely want one of these for my Axial Scorpion RTR as an easy way to boost its top speed for bashing around. When I want to hit the rocks, I'll be able to unbutton the motor with two screws, remove the "speeder," then drop the motor back in--much easier than wrestling with different spurs and pinions, which would not yield the same 1:2 gear-up as the Gear Speeder. --Pete

RC4WD Ultra Compact 1:2 Gear Speeder Unit for 540 Motor
Increase speed and decrease torque!

This speeeder unit is designed to fit any RC truck, car, robot, airplane, boat that uses standard 540 motor. It will work as long as there is enough room for the extra length (.7 inch / 18mm).

CNC machined high precision aluminum housing
Stainless hardened steel micro size internal gears
Custom made pinion gears
Universal, fit any 540 Motor
Engineered & Manufactured by RC4WD
Specification:

Gear speed up ratio: 1:2

Overall diameter: 36mm

Legth: 18mm (.7 inch)

Output shaft diameter: 3.17mm (with a flat surface for mounting standard RC pinion gears)

Total metal gears: 6
Total Parts: 11

What's included:

1x RC4WD Ultra Compact Gear Speeder Unit
1x Steel Pinion Gear

Note: Due to the added length, you will need some longer motor mounting screws. For example on a Tamiya Clod axle, you will need two M3 46mm long screws (not included).


About Gear Speeder Unit (GSU)
When this GSU is used, it will increase the motor RPM by 100%.

[coligny]

Any ball bearing inside ?

[quick5pnt0]

Looks like bushings.

I really don't understand the point of this. I can't see how this is any easier than changing the pinion and spur.

As I noted, installing the speeder will be "much easier than wrestling with different spurs and pinions, which would not yield the same 1:2 gear-up" --Pete

[Peterbilt]

Looks like bushings.

I really don't understand the point of this. I can't see how this is any easier than changing the pinion and spur.

I guess in some cases it might help, but Im with you on that one.

However, RC4WD makes the same product but in gear reduction, and those are wonderful. More reduction that you could ever get out of pinion/spur changes. I guess they got bored and tried to make one go the other direction:rolleyes:

[andystoybox]

About Gear Speeder Unit (GSU)
When this GSU is used, it will increase the motor RPM by 100%.

Let's see; 3,000 RPM X 100% = 3,000. Hmmm. Let me get two and stack them. Then I will be able to get 3,000 RPM X 100% = 3,000 RPM and then the other one will take that 3,000 RPM X 100% = 3,000 RPM.

Oh, and then remove about 20% for driveline losses due to worn bushings and it will be 3,000 RPM - 20% = 2,400 RPM.

I guess it would make more sense if it actually made the motor RPM increase by 200%. That way when the shaft turns at 3,000 RPM the pinion will actually travel at 6,000 RPM. But what I don't get is why you would double the rpm and run it through a bushing supported driveline. Unless you included a zerk fitting to press fresh grease through all the driveline in the drive doubler, it doesn't seem to make sense to me.

Also, if you were wanting to get a faster motor, wouldn't you just take out the lathe motor and put a 19 turn motor in it's place??? Someone correct me if I am wrong on this.

[coligny]

Let's see; 3,000 RPM X 100% = 3,000. Hmmm. Let me get two and stack them. Then I will be able to get 3,000 RPM X 100% = 3,000 RPM and then the other one will take that 3,000 RPM X 100% = 3,000 RPM.

Oh, and then remove about 20% for driveline losses due to worn bushings and it will be 3,000 RPM - 20% = 2,400 RPM.



I think it's a missprint...

As for the reduction unit... The Robbe is cheaper and ballraced...
Robbe Website (http://at.robbe-online.net/rims_at.storefront/480936e100316d1f271b3e0dc14605e4/Product/View/1&2D4485)

[PeterV]

C'mon guys, get past the "100% increase" goof--the text clearly says "Gear speed up ratio: 1:2," which means the unit's output shaft turns twice for every single revolution of the motor's output shaft. Did you really think this product was intended to have no effect on the motor's rpm?

As for the bushing...yes, a bearing would be nicer, but doubling the rpm of a 540 motor is hardly a strain for a big oilite bushing. This product isn't supposed to be for already high-rpm motors, it's for low-rpm motors.

And yes, I could swap motors to get more rpm, but that would involve unsoldering the motor, and I don't want to do that in the field.

[andystoybox]

Peter, I thought about that as I posted. How many people out there that buy this will actually have soldered terminals on their motors?

I actually think that this would fit in the category with the infamous "supercharger". It's something you would find in some rich kids' toolboxes and is a good buy after they finally decide that they never needed it.

Doesn't it cost about the same as a good low turn motor? I guess I could justify disconnect terminals for two motors (deans or whatnot) and a second motor before I would add the extra weight just to tool around at twice the speed of my normal crawl.

Also, wouldn't you need to regear the twice as fast 45 turn motor to use it's torque band correctly just the same as putting a different motor in?

[fuzzychickens]

Nice idea, but the screws should be included.

[hellhound]

maye it's me, but the statement is true made by rc4wd. it states that it wll increase the speed by 100%. so if the input rpm is 100 rpm, then the gearbox will increase the out put by 100% of the input. so this means that the input (100) plus the increase of the gearbox (100% of the input, which is 100) equals 200. if the gearbox increased by 50%, then the output would be 150 rpm. an increase of 100% is doubled. the statement made by andystoybox's statement might make sense on paper, he is misinterpreting the information given. it obviously states( rc4d) that the unit is 1:2. by defiition, 2 is 100% bigger than 1. by the inverse, 1 is 50% smaller than 2. that is just the way math works. why, it is because of inverses. 50% is the same as 1/2, and the inverse of 1/2 is 2/1, or 2. hope this helps.

[rccardude04]

a 50% increase is 1 : 1.5
100% increase is 1 : 2
0% increase is 1 : 1

Anyway, I think this is a rock crawler thing. If you have a crawler and want it to go 20mph instead of 10, this would be kinda cool.
I don't see any other practical use.

-Eric

[andystoybox]

It would be a cool thing for a clod if it were able to fit between the axle links. Also, I see the other posters' logic on it being a true statement at 100% but I also don't agree that it really will give that amount. The parasitic losses will only allow it to increase to about 80% more than the original. On a crawler it won't matter though.

[hellhound]

^^^^^^^^^:roll2:

all i can say is prove it. a unit that is geared 1:2, cannot be variable output. i'm done.

[rc411]

still happy with just swapping pinions and spurs... i'd see this on a noob's car, as they are going to do anything to get more speed.

[ElectricThunder]

^^^^^^^^^:roll2:

all i can say is prove it. a unit that is geared 1:2, cannot be variable output. i'm done.


Andy didn't say it was variable. He said that due to parasitic losses (as in, the energy that must be expended to turn the gears to get double the RPM at the output and also friction that must be overcome in the bushings and gears), it realistically won't be exactly double the RPM on the output. It will only be 180% of what is put in. So if you put in 1000 RPM, the output RPM will be 1800. That is what he is trying to say.