Drop a Harley - one foot!


October 22, 2003, 09:47 PM
Today's useless piece of info .....

Drop a Harley thru one foot ..... with an attached projection of say .357 dia .. and the impact from said projection closely approximates the impact from a ''slow'' .. (say 1250 fps) .357 mag 158 grainer.

Beware falling Harleys!!:rolleyes: :p :D

Sorry .... must be the phase of the moon!:uhoh:

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Mal H
October 22, 2003, 09:52 PM

October 22, 2003, 09:55 PM
Aaah! Now I know. I always wondered about that one......


October 22, 2003, 09:56 PM
Sorry Mal ..... flippancy got the better of me! I was just equating the muzzle energy of a modest load mag bullet ..... a 158 grainer .... to something else! This calculated to around 550 ft lbs .. much same as the Harley dropped by one foot.

I'll be OK by tomorrow ... promise!! :p

Mal H
October 22, 2003, 10:18 PM
Would that be an FMJ Harley or HP? :)

I kinda figured that's where you were going, but I thought you must have a stripped Harley since most are around 700 lb dry weight which is more than even a heavy .357 Mag. I think the Sportster is around 550, though.

October 22, 2003, 10:26 PM
A heavy mag . ya know the ''real'' ones .. homeloads .... well if pushing 1500 then we have about 790 ft lbs .. so ... we're still in there!!

Oh BTW .... a JHP Harley ... we want some expansion!!

As I said ...... I'll be fine by tomorrow! :D

October 22, 2003, 10:45 PM
Well, that settles it once and for all: next time a "Which one should I buy" poll or caliber war crosses the screen, the definitive answer is Harley. :D

Standing Wolf
October 23, 2003, 12:10 AM
Actually, that's a good way to explain muzzle energy.

October 23, 2003, 12:12 AM
BT, DT :banghead: :banghead:

October 23, 2003, 08:16 AM
Are we droping a Fat Boy or a Sporty or an Ultra or what? On top of that what kind of biker admits to dropping his Bike?:evil:

What if we Drop a Yamaha or a Honda??

Which is better for stopping a Zombie/Attacking Bear or even a Zombie Bear??

We need details!!

October 23, 2003, 10:02 AM
We need details!! Techmike ..... I guess my Honda VTX would do too ... :p The ''drop'' of course is an ideal vertical drop ........ not a ''side-scraper'' so .. no harm to bike ... just to the ''target''!!:evil: :D

October 23, 2003, 11:57 AM
Dude, reconsider wearing that helmet! :scrutiny:

October 23, 2003, 04:19 PM
How many inches of gelatin does a Harley penetrate? ;-)

October 23, 2003, 04:38 PM
Actually, I am not sure the English unit of foot pounds actually means a pound weight dropped one foot. Energy is actually equal to:

e = 1/2 Mass X velocity (sq)

In English units, mass is given in something called slugs (not pounds) and I don't remember the definition of a slug... other than my wife's saturn.

Complicating it further, in the English system foot-pounds is also the measurement of torque which is totally different from energy.

Either way, the thing to remember is that when riding a Harley, always lean INTO the hill at a stop sign or you will have the total mass of the bike on your leg in about a half second.

October 23, 2003, 04:59 PM
Might be equal in terms of energy, but certainly not momentum...

October 23, 2003, 05:08 PM
Bounty Hunter ........

The torque ft-lbs is in a way the reverse of our energy unit for projectiles ... one foot pound is the energy required to raise one pound weight thru one vertical foot ....... or of moving an object one foot against a resistance of one pound.

The slug is a mass unit ...... tho I forget its definition right now .... and the pound is itself a unit of force ... derived from slugs and feet/sec^2 ... the acceleration due to gravity.

Looked a bit further and best I could find for 'slug' was ..... ''unit of gravitational mass of approximately 32.174 pounds '' ... this seems to relate again to pound force and acceleration due to gravity (32 ft/sec/sec.... 9.81m/sec/sec)

Lord Grey Boots
October 23, 2003, 06:43 PM
I was going to ask if dropping a harley on someone would "Stop them".

thinking a bit.. I am not going to be able to left a 750 lb bike off of me, therefore won't be going anywhere, so I think I would be sufficiently "instantly one shot stopped"....

October 23, 2003, 08:44 PM
After careful consideration I decided I do not want to test it and "drop" my Harley (Fatboy).


October 23, 2003, 09:50 PM
No "need" to test it; results are entirely predictable....:what:

October 24, 2003, 11:02 AM
Well, that settles it once and for all: next time a "Which one should I buy" poll or caliber war crosses the screen, the definitive answer is Harley.

Works for me! :D

Jesse H
October 24, 2003, 03:53 PM
I guess my Honda VTX would do too ...


1300 or 1800? *drool*

October 24, 2003, 04:31 PM
1300 or 1800? *drool* Just the 1300 .... it's the C4 custom ... very new. Put only about 3k on it so far .. now have to keep the baby warm for winter. Had considered the 1800 but ... like the mpg's on 1300 ... 45 normal, near 50 real smooth cruising.

This pic was August when daughter and her old man were staying ..... she's as good a pillion rider as she is a casual shooter!!


October 29, 2003, 09:48 AM
I have one of these:


Don't know which Harley was used for the comparison, but this bike is much more heavy than an Ultra Classic so it must be at least a .41 mag!!

October 30, 2003, 11:09 AM

Actually, the pound-force/slug-mass system is only one formulation of the traditional British-style system, and although widely used in pre-metric engineering circles in the U.S., it has never been the official standard here. In the U.S., the legal pound avoirdupois is a unit of mass defined as EXACTLY 0.45359237 kilogram per the U.S. National Institute of Standards and Technology (NIST), formerly the National Bureau of Standards. The official U.S. pound has been defined in terms of the kilogram since 1893; before that, it was defined as the mass of a brass artifact kept in Washington.

The reason engineers liked to use slugs is that if you measure mass in pounds mass and force in pounds force ( = the force of 1 standard gravity on a mass of 1 U.S. pound), then Newton's law F=ma doesn't work out; you have to make it F=kma where k is a correction constant. (If you think that's weird, NASA used an even weirder set of units in the 1960s--the pound-force as the force measure, the inch as the length measure, and the "slinch" (slug-inch) as the mass measure, 1 slinch being equal to the mass that 1 pound force would accelerate at 1 inch per second (IIRC).

October 30, 2003, 12:21 PM

Thx for the clarification. My engineering training was all geared around metric ... so for me it was all kg, Newtons etc ... some logic to that re base 10 but I still hanker after the ''old way''!!

Having said that ... age and a degree of ''brain corrosion'' seem to make me way less fluent than I used to be - or should be! Don't use all this stuff much these days.

Browns Fan
November 2, 2003, 08:47 AM
Would you use a Harley on deer, or, oh, here we go... how about using for defense against bear?


Johnny Guest
November 3, 2003, 11:11 AM
- - - And everyone has pretty well had their say, but this is really a bit OT.


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