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Conference foundr::firearms

Title:God made man, but Sam Colt made men equal
Notice:Welcome to the firearms conference!
Moderator:PEAKS::OAKEYIN
Created:Tue Mar 04 1986
Last Modified:Fri Jun 06 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:6616
Total number of notes:49869

6587.0. "Fluted vs unfluted cylinder" by PEAKS::KNIGHTING () Tue Jan 28 1997 15:39

    	I was looking at a handgun in .44 mag the other day.  It had an
    unfluted cylinder.  The salesdude told me the unfluted cylinder has two
    advantages:  it's stronger and it disperses heat better.
    
    	OK, I'll buy stronger, but I though heat dispersion was a function
    of surface area.  Otherwise, all radiators would have flat sides and
    not vanes.  Is he right, and if so, what physical principle am I
    missing?
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6587.1FABSIX::J_SADINFreedom isn't free.Tue Jan 28 1997 16:028
    
    
    	I'd say he's full of cr*p about it dispersing heat better. A fluted
    barrel will cool faster than a non-fluted one, so I would think the
    same would apply for cylinders...
    
    
    	jim
6587.2BSS::PROCTOR_RSniffing the floral arrangementTue Jan 28 1997 16:298
    I'll second on the sales weenie being full of doo-doo.
    
    Surface area is the measure of heat dispersal;  a fluted barrel has
    more surface area, hence will disperse heat more readily. This is the
    reason that radiators have lots of little tubes, rather than one big
    one...
    
    Mr. Science
6587.3Not stronger eitherNEWVAX::WHITMANgun control = 5% gun + 95% controlTue Jan 28 1997 20:257
   The stronger cylinder argument is also BS as the weak point is typically
the distance between the charge holes not the charge hole to the outside of
the cylinder OR the space where a flute is typically cut.  I believe the
cylinder is un-fluted for 2 reasons; 1 is increased weight to dampen recoil and
2 is cost of manufacture as it's 1 (or 6) less operations...

Al
6587.4FABSIX::J_SADINFreedom isn't free.Wed Jan 29 1997 07:318
    
    
    	good point Al, although another weak spot is the cutouts for the
    hand that moves the cylinder. In some larger caliber pistols they will
    actually offset these cutouts so they don't lie on top of the charge
    hole.
    
    	jim
6587.5Well, not all wrong.SBUOA::MARINIWed Jan 29 1997 09:1737
    Actualy the salesman wasn't wrong, just not explicite.
    
    Unfluted vs fluted,
    
    When a mass reaches it's peak thermal capacity, it begins to radeate,
    the rate of radeation is effected by surface area howerver the peak
    thermal capacity is a function of mass, that is to say the more mass
    the higher the thermal capacity.
    
    Unfluted will take longer to heat up to it's peak thermal capacity,
    once heated it will radeate at a lower coeficient than a comparable
    fluted cylinder.
    
    So...if we measure time to peak thermal capacitance the unfluted
    cylinder wins the " keep cool " prize, but if we measure rate of
    radeation the fluted cylinder wins the " cool down " prize.
                    
    I guess it depends what measurements we like best and go from there.
    
    Strength,
    
    Given same geometric configurations/machining features for each, the
    unfluted cylinder is stronger ergo more burst resistant, again it's
    simply a mass function over preassure dispersion. The more mass the
    more resistance to the preassure spike/longer impulse duration.
    
    Both are no stronger than thier weakest/thinest cross section however
    the unfluted cylinder has more mass to disperse to/spread the preasure
    impulse over and is more likely to remain intact longer.
    
    Anyway, this is what I know.
    
    Hope it helps
    
    
    
    
6587.6DECWET::LOWEBruce Lowe, DECwest Eng., DTN 548-8910Wed Jan 29 1997 12:323
re: .44 mag weak points

Don't forget the hand which holds the grips :-}
6587.7another reason for unfluted cyclindersSSDEVO::COLECCHIWed Jan 29 1997 13:5512
S & W are famous for making special runs of pistols with 
unfluted cyclinders. I have what is called a 357 magnum
"Classic Hunter" Its special features is 1 of 5000 made
black front site and white outlined adj rear sight. Unfluted
cyclinder and a full lug barrel on an L frame which later
became the model 686. Also the gun is stainless. I know they
have made the classic hunter in 44mag also but not the 41mag.
I was told that the unfluted cyclinder doesn't reflect light
but I really don't believe that. Usually the classic hunters
6" or 8" barrels.

JC
6587.8Heavy is good.ALFSS2::HENDERSON_JWed Jan 29 1997 14:4215
    
     Hi,
    
     I think the biggest advantage of an unfluted cylinder,is a little
    increase in weight,which helps reduce percieved recoil. I like a
    heavy handgun. I have a German copy of a Colt Mod.P,like the Sauer
    copies. You can tell everything was set up for 45 or 44-40,cause this
    guy is in .357,and there is an awful lot of steel between the
    chambers,and it is the heaviest handgun I own. The thing just rolls a
    little with the hotest .357,something which would cause my Mod.66 to
    stand up and take notice,doesn't even wake up this German single
    action.
    
    Joe
    
6587.9Thanks!PEAKS::KNIGHTINGThu Jan 30 1997 13:368
    Thanks to all who responded.  I found .5 to be particularly
    enlightening.  I have to admit I like the looks of the unfluted
    cylinder, and it would appear that there isn't a huge difference. 
    Recoil reduction is certainly desirable, so I suspect I'll go with
    the unfluted cylinder.
    
    This conference is a *great* source of information, some of which is
    even probably accurate (0,-).
6587.10BSS::PROCTOR_RSniffing the floral arrangementThu Jan 30 1997 16:127
    >  I found .5 to be particularly enlightening.
    
    
    Personally, I found .2 to be witty, insightful, chock full of
    information, and it beat the hell out of .5.
    
    IMHO.
6587.11FABSIX::J_SADINFreedom isn't free.Fri Jan 31 1997 16:176
    
    
    	
    	ah, go sniff a floral arrangement....or something....
    
    
6587.12Ultimate FlutingMINOTR::BANCROFTMon Feb 03 1997 10:103
    Check out the Colt "Cloverleaf" of the 1870's
    It was like 4 tubes around a pivot pin.
    Ugly SOB (the GUN!!! not any of you!)