Transmissions

[Cossett]

I think the all in one 9s is a great idea, but it's a little on the large side for the guys that want a interior, a day cab, a tipper on the back or other,
If it was smaller/more compact I think there would be a bigger market for the guys that want all those gears and were willing to fork out over a grand for a gear box,
For most people it would come down to cost, how much room it takes up as there are alot of cabs out there that are crammed with electrics when the body is off and for most a 3 speed is plenty...
Just my thoughts...

[Aero 9000]

Originally Posted by Cossett

I think the all in one 9s is a great idea, but it's a little on the large side for the guys that want a interior, a day cab, a tipper on the back or other,
If it was smaller/more compact I think there would be a bigger market for the guys that want all those gears and were willing to fork out over a grand for a gear box,
For most people it would come down to cost, how much room it takes up as there are alot of cabs out there that are crammed with electrics when the body is off and for most a 3 speed is plenty...
Just my thoughts...

Thankyou for your thoughts on the matter.

Many things do not go from 1:1 down to scale. This is a real problem. this is why the trans is a lot larger than a scale model of a real trans would be. The gears inside are around Tamiya size. And there are a number of technical reasons why Tamiya went for that size of gears.
If you did a scale model of a real trans the gears and shafts would be tiny. It would be like watch making, it would be fragile and prone to breakage and bearing failures and the gears being so small would need to hardened steel and then ground...
OMG....if you think 1300 bucks is over the top, a minature scale gearbox with tiny hardend and ground gears would cost more than the national debt....

This monster 9 speed can be mounted further forward in the chassis with some inginuity reducing the overhang at the rear of a day cab to 1/2 inch.

Everything in engineering is a compromise, what one person will trade off another won't.....As i say it is a matter of individual taste...

[Aero 9000]

Originally Posted by Cossett

I think the all in one 9s is a great idea, but it's a little on the large side for the guys that want a interior, a day cab, a tipper on the back or other,
If it was smaller/more compact I think there would be a bigger market for the guys that want all those gears and were willing to fork out over a grand for a gear box,
For most people it would come down to cost, how much room it takes up as there are alot of cabs out there that are crammed with electrics when the body is off and for most a 3 speed is plenty...
Just my thoughts...

Size comparison:....

[Aero 9000]

Originally Posted by Cossett

I think the all in one 9s is a great idea, but it's a little on the large side for the guys that want a interior, a day cab, a tipper on the back or other,
If it was smaller/more compact I think there would be a bigger market for the guys that want all those gears and were willing to fork out over a grand for a gear box,
For most people it would come down to cost, how much room it takes up as there are alot of cabs out there that are crammed with electrics when the body is off and for most a 3 speed is plenty...
Just my thoughts...

9 speed alternate mounting positions..

[rc_farmer]

by the time you shift thru all 9 gears, it will be across the stateline.

[Aero 9000]

Originally Posted by rc_farmer

by the time you shift thru all 9 gears, it will be across the stateline.

It would not allways be necessary to shift through all 9 gears.

As shifting is concerned i would forsee that the 9 speed would essentially be shifted by selecting a range (high, mid, or low) with the right stick on the control in the vertical plane (right horizontal of course being steering) and then shift the gears 1st, 2nd and 3rd as normal with the left stick on the control in the horizontal plane, only changing ranges as the overall situation requires, rather than starting in 1st / low and shifting all the way through all the 9 gears to top. So in some situations you would start in High range / 1st and not even look at the 6 gears below that. In a crawling situation you may decide Low range is suitable and then start in either 1st, 2nd or 3rd and the same for Mid range. Choose a range then choose a gear. Having said that you can also start in low range and shift up through the ranges to high range selecting 1st, 2nd or 3rd at the same time. Almost endless possibilities.

[scalelover]

Originally Posted by Aero 9000

9 speed alternate mounting positions..

Even with these pics you can see its nearly impossible to have an interior, especially in a day cab. I really dont even see a way in a conventional or an extended sleeper without figuring out a way to lay it on its side.

--Dan

[Aero 9000]

Originally Posted by scalelover

Even with these pics you can see its nearly impossible to have an interior, especially in a day cab. I really dont even see a way in a conventional or an extended sleeper without figuring out a way to lay it on its side.

--Dan

I will have to say having a interior was not a priority when designing this transmission. For me personally it is not a priority at all. I don't see the need to make the cab comfortable for a 5 inch hight plastic man. The cab interior is far better utilised for equiptment. If cab interiors are a priority it may be more suitable to build a static model.

The transmission connot be laid on its side. It contains automatic transmission fluid. It would make a awfull mess, not to mention oil up the motor......

[sparkycuda]

One difference between 1:1 and our equipment is the prime mover RPM. Diesel engines have a very narrow power band and low max RPM, requiring multi-gears to match available power/torque and road speed. Our electric motors have a considerably wider RPM range, depending on turns, etc. I chose a low RPM 85t motor for my Payhauler. It turns 5200 RPM at 7.4V, so is about double the diesel engine RPM in the real truck. By using a 3-spd trans, I just about replicate prototypical road speed, since the 1:1 had a 6-spd trans. Lower turn motors spin a lot more RPM, reducing the actual need for a many-gear trans - use of one speed or a 2-spd trans works just fine since we seldom see anything like scale speed (70 MPH) with our trucks.

But then, nothing beats shiftin' those cogs 9 times going across the room! To each his own - just have fun doin' it.

Ken

[Aero 9000]

Originally Posted by sparkycuda

One difference between 1:1 and our equipment is the prime mover RPM. Diesel engines have a very narrow power band and low max RPM, requiring multi-gears to match available power/torque and road speed. Our electric motors have a considerably wider RPM range, depending on turns, etc. I chose a low RPM 85t motor for my Payhauler. It turns 5200 RPM at 7.4V, so is about double the diesel engine RPM in the real truck. By using a 3-spd trans, I just about replicate prototypical road speed, since the 1:1 had a 6-spd trans. Lower turn motors spin a lot more RPM, reducing the actual need for a many-gear trans - use of one speed or a 2-spd trans works just fine since we seldom see anything like scale speed (70 MPH) with our trucks.

But then, nothing beats shiftin' those cogs 9 times going across the room! To each his own - just have fun doin' it.

Ken

Yes Ken.....you got it...... to each his own...!!

I've been experimenting with 12volt RS555 motors running on 7.2 volts.
In that configuration they act more like the diesel, it's more of a challenge to drive, and more realistic, they drive like a truck instead of a sports car.....the spin off is the batteries last for ages...