Belt or shaft & gear diff or Ball diff
#1
Belt or shaft & gear diff or Ball diff
In My opinion after test both type
Belt or shaft
Shaft
Good point
1- low Maintenance
2- high top speed
3- Not complex
4- heavy duty
5- free run without any Resistance
Weak point
1- non
Belt
Good point
1- non
week point
1- high maintenance
2- lower top speed
3- complex
4- Resistance its like (drag brake 10%)
gear diff or Ball diff
gear diff
Good point
1- Can handle high torque
2- Very heavy duty
3- Low maintenance
4- Handles easily with all brushless motor
Week point
1-Slightly heavier
Ball diff
Good point
1- little lighter
week point
1- Can't handle high torque
2- Loosening (slip)
3- high maintenance
4- Sometimes crying with some brushless motor
Belt or shaft
Shaft
Good point
1- low Maintenance
2- high top speed
3- Not complex
4- heavy duty
5- free run without any Resistance
Weak point
1- non
Belt
Good point
1- non
week point
1- high maintenance
2- lower top speed
3- complex
4- Resistance its like (drag brake 10%)
gear diff or Ball diff
gear diff
Good point
1- Can handle high torque
2- Very heavy duty
3- Low maintenance
4- Handles easily with all brushless motor
Week point
1-Slightly heavier
Ball diff
Good point
1- little lighter
week point
1- Can't handle high torque
2- Loosening (slip)
3- high maintenance
4- Sometimes crying with some brushless motor
#2
This topic has been covered just once or twice already...
http://www.rctech.net/forum/search.php?searchid=6199991
You miss the main reason why there are no competitive shaft cars - torque steer.
http://www.rctech.net/forum/search.php?searchid=6199991
You miss the main reason why there are no competitive shaft cars - torque steer.
#3
Tech Master
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Join Date: Aug 2003
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#4
you are wrong about the shaft giving more top speed than belts. It's the opposite. Ask Hara.
If you belts are tensioned too much, it will cause a loss of top speed and a bit of " drag brake", otherwise it won't.
as for the gear vs ball diff, I agree in general, ( the s400 diff was a great idea, same for the durango) but some racers like to have the possibility of giving a little slip to their diff or like to adjust it without opening it. Fot offroad gear diffs will become the norm though I guess.
If you belts are tensioned too much, it will cause a loss of top speed and a bit of " drag brake", otherwise it won't.
as for the gear vs ball diff, I agree in general, ( the s400 diff was a great idea, same for the durango) but some racers like to have the possibility of giving a little slip to their diff or like to adjust it without opening it. Fot offroad gear diffs will become the norm though I guess.
#5
#6
#7
The torque effect is obscured because the soft springs soak up much of the energy before it reaches the tyres. The tyres have less grip and a softer carcass so cause less of a reaction to inputs. The large, heavy wheels on a buggy also create a large gyroscopic effect of their own, encouraging the car to run straight.
You can notice the torque effect in touring cars. Just a little kick to the side on power, just a hint of understeer turning in one direction. And no, I haven't noticed the effect in a 4wd shaft buggy.
#8
Hmmmmmmmmm
ALERT-[Possible Rhetorical Question]
The the last year a shaft driven gear diff TC won a National Championship?
The the last year a shaft driven gear diff TC won a National Championship?
#10
So wouldn't one think that after "all the testing and racing that all these pros would do before releasing a car" that they would notice this "torque steer" off the bat and stick to belt driven cars? I.e. - not even bother releasing the shaft driven cars???
And also, BEFORE there were ever ball diff cars, every single one of them was "gear diff". My Tamiya Grasshopper had a gear diff. I wouldn't have thought of "paying extra" for them now.
The reason ball diffs came around was that gear diffs would spin the inside tires in a turn = the same way in a real car. This is why they outfit sports cars with a "limited slip differential". The ball diffs act the same exact way. So I really don't understand why people are going back to gear diffs AND "spools" at the front of the car...
#12
You know, the thing that bothers me about this supposed torque steer is that before there were shaft driven cars, they were all belt driven.
So wouldn't one think that after "all the testing and racing that all these pros would do before releasing a car" that they would notice this "torque steer" off the bat and stick to belt driven cars? I.e. - not even bother releasing the shaft driven cars???
And also, BEFORE there were ever ball diff cars, every single one of them was "gear diff". My Tamiya Grasshopper had a gear diff. I wouldn't have thought of "paying extra" for them now.
The reason ball diffs came around was that gear diffs would spin the inside tires in a turn = the same way in a real car. This is why they outfit sports cars with a "limited slip differential". The ball diffs act the same exact way. So I really don't understand why people are going back to gear diffs AND "spools" at the front of the car...
So wouldn't one think that after "all the testing and racing that all these pros would do before releasing a car" that they would notice this "torque steer" off the bat and stick to belt driven cars? I.e. - not even bother releasing the shaft driven cars???
And also, BEFORE there were ever ball diff cars, every single one of them was "gear diff". My Tamiya Grasshopper had a gear diff. I wouldn't have thought of "paying extra" for them now.
The reason ball diffs came around was that gear diffs would spin the inside tires in a turn = the same way in a real car. This is why they outfit sports cars with a "limited slip differential". The ball diffs act the same exact way. So I really don't understand why people are going back to gear diffs AND "spools" at the front of the car...
Back when the ball diff was created, electric cars either had no diff at all, or a completely unsealed and truly "open" gear diff. The cars also has a lot less power. The lightweight, easily adjustable ball diff was an improvement.
Now, we have sealed gear diffs filled with silicone fluid to create a tunable limited slip effect, and ample power in almost every class.
Advantage gear diff again.
Shaft drives (in touring) again came from an era when there was a lot less power. Shaft drive is more efficient, especially compared to the small pulley belt drive systems popular at the time. But a shaft drive car never won the worlds. Put any reasonable amount of power in there and torque steer will happen. This makes the car unpredictable and inconsistent between left and right turns.
Advantage belt drive again.
Spools are silly, but they make the cars run well when we don't yet have a diff that can have a very strong limited slip action at the front. Perhaps the new generation of gear diffs with 100k-plus oils in them will consign the spool to the history books as well.
#13
Tech Fanatic
iTrader: (8)
Belt or shaft
Shaft
Good point
1- low Maintenance
2- high top speed
3- Not complex
4- heavy duty
5- free run without any Resistance
Weak point
1- non
WRONG ! i remembered cars like the yokomo SD SSG and HPI Pro4 would always break the front bevel gear when you hit anything , becuase the bevel gears have no "give".
Shaft
Good point
1- low Maintenance
2- high top speed
3- Not complex
4- heavy duty
5- free run without any Resistance
Weak point
1- non
WRONG ! i remembered cars like the yokomo SD SSG and HPI Pro4 would always break the front bevel gear when you hit anything , becuase the bevel gears have no "give".
#14
Ball tranny and belt diff
#15
Tech Addict
Ive taken some big hits in the shafty without breaking bevel gears.
HPI Pro4 were known for some brittle/weak plastic parts, why else would there be a recommendation to 'boil' gears before use in the PRO4 forum !!!!