>
> > Not really. The Weight and loading is easy.
> > We add your weight, my weight, the fuel, and the trike,
> > and see if it adds up to less than 992. It does.
> > I can do that in my head.
> > No, our concern is what you mentioned about the
> > nose wheel hanging lower.
>
> You must have done this plenty of times Jim,
> ... it must be quick and easy for you.
>
> How about doing just one more for the considered
> loading (Richard doing his checkride with you),
> and put it in the group files?
> front seat 300
> rear seat ~178
> fuel 30
>
> I've never seen a sample of a WSC weight and balance
> in any text book.
> (showing as you promise "nosewheel height")
>
> Thanks,
> Mike
>
> WSC W&B is like any other W&B, so there doesn't have to be a sample of WSC
> specific W&B in the textbook. In almost every textbook I have seen there is
> the generic teeter totter examples so that the pilot understands the concept
> of weight x arm = moment and that when all the weights are added up and all
> the moments are added up, you simply divide the total moments by the total
> weight and you have the CG. In trikes, the CG is typically "in the
> vicinity of" the rear seat, and simply has to be behind the hang point for
> the rear wheels to hang lower than the nose wheel. Once the CG of the
> trike is determined (this involves weighing the trike with scales at each
> wheel) it is simple to measure out the locations of the front seat, rear
> seat, fuel tank, baggage area, etc., and plug in the numbers. I made a
> spreadsheet for my W&B worksheet (or W&L worksheet, I don't care what you
> call it. Same math.) for each trike so I could plug in the numbers for each
> one with some various loading scenarios. I don't have the DTA one here at
> the house, but I do have a copy of my old aerotrike paperwork and for a 300#
> guy, which I happened to choose for the worst case scenario, the math showed
> that the CG was still aft of the hang point location, meaning the trike
> would hang lower in the rear than the front.
>
> I did look in the SP written test study guide and you are correct, the
> chapter on W & B is really lame. Even for fixed wing people there is almost
> nothing on W & B. Probably because at the LS level, our loading options are
> so limited that there is more concern with weight than with the balance
> part. However, when we have a triker say he'd had a problem with landing on
> the nose wheel a couple of times and it wasn't very pleasant, that should
> tell him that he should figure out what's going on. Any textbook at the
> Private Pilot level and above will have some info on how to do basic weight
> and balance and certainly an instructor textbook should have it so when you
> say you haven't seen WSC specifically addressed, I believe you. However,
> you will be able to figure it out for a trike because the concept is no
> different.
>
> Personally, I didn't use the EAA supplied W&B paperwork. I made my own
> because it was more complete and had examples of a variety of loading
> scenarios to cover about any contingency. A story that was related to me
> once underscored the importance of understanding this and knowing how to
> calculate it. Triker is approached by a cameraman wanting ot attach a movie
> camera to nose. Triker says OK. Next day, cameraman shows up with a camera
> twice as big and attached to about a 3' boom to attach to the nose. Warning
> bells go off in triker's head. He understands W&B and does a calculation
> and determines nose will be hanging low.
That's why every triker should
> understand the concept. So when someone
comes out with something out of the
> ordinary, be it a camera on a boom or
a 320# student in front, he knows to
> do the WxA=M thing and figure his CG.
Only tools needed are a tape measure,
> scales, and some sort of plumb bob for extra accuracy.
> Jim
"I made a spreadsheet for my W&B worksheet
(or W&L worksheet, I don't care what you
call it. Same math.) for each trike so
I could plug in the numbers for each
one with some various loading scenarios."
Yes Jim... -that-!
Could you show us a copy of that file please?
(it's probably an excel file?)
Thanks,
Mike
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