Posted by ScottyHOMEy on November 14, 2008 at 08:46:14 from (71.241.193.150):
In Reply to: Re: CUB vs BN posted by old on November 14, 2008 at 07:31:51:
The difference in width between a B and BN is 8", four on each side. Both sides of a BN are the same width as the right side of an A.
So technically, yes, the B, being 8" wider is more stable than the BN with the wheels and rims in like positions, but a lot of folks in the past have mistakenly read that to mean that the BN is somehow unstable, which I don't believe is the case.
If stability were a worry, there are a lot of things to be done (in addition to careful operation, which is always a must). Everytime I look at my neighbor Dave's A (our next project) I'm struck by how wide the rears are set out on it. A glance out of the corner of your eye from the rear you could almost mistake it for a BN -- with the wheels turned out and the rims mounted to the outside, wheel lugs on the outside, he's at 60" (already 4" more than the narrowest you can set up a BN) and could go 4" wider by mounting the rims with the lugs to the inside. If the wheels on a BN were set out the same as on Dave's A, the rear tread would be 88" and could still be taken out to 92".
Given a wheelbase of about 71", that's more than wide enough to be stable in all but extreme situations. Putting our old friend Pythagoras to work, with the rears set to 84", you have very nearly an equilateral triangle between the points where the rears and the front end contact the ground. I'd call that quite stable for a tractor that isn't especially top-heavy.
Put wheel weights on (though not especially desirable if most of its work is cutting grass in the yard, epecially with ag treads!) and the center of gravity is lowered (because of the dropped final drives being below the COG) for even more stability if needed.
Bringing the Cub back into the considerations, I tend to think of it and the A with their offset configurations, as "less stable" than either the B or BN, but rush to remind how Dave has set his A out so wide. The peril of the offset is in any scenario that might lean the tractor to the left. It is very common to find As with a stamped steel wheel on the left (short) side and a heavier cast wheel on the right, which is an easy and effective way to improve stability by moving the center of gravity away from the left (short) side. I don't know if cast wheels are available for a Cub (I think someone told me they weren't) but one could accomplish the same thing on a Cub with steel wheels on both sides by adding a wheel weight to the right side only.
A Cub with or without the added wheel weight might be preferable if only for its lighter weight (less compaction of the lawn) and lower clearance (them cuss-ed trees!) than a BN.
It's long enough to be a nickel, but that's my two cents.
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