Allison vs Triad 21 handling?

**freeebird** · 02-13-2017, 07:38 PM

Cute

**whipper** · 02-15-2017, 02:07 AM

Just looking at these two pics side buy side there are differances I can see that would benifit the V21 in higher speeds. One of the reasons the GT20 {probably} gets flighty would be the flared bow farther forward than the less flared bow of the V21. The V21 also has a more raked shape down the chines. At the Stern the V21 is more flared out from the keel line with a more straight edge to the rub rail. That in combination with the more swept back profile helps the V21 to fly at a higher speed with a more aerodynamic shape than the GT20. The GT 20,s big frontal area though would help her to fly at a reasonable High speed with less power isn't really the shape of choice for really high speeds like above 100mph. Also the stern area of the GT 20 were the flare from the keel to the rub rail comes out is more rounded. This looks nice and has some flying function but not as aerodynamically efficient as a wider flare and straighter edges. The best example on any Vee Bottom boat made today is the Allison RR. Very small very swept back frontal area, super wide wing flared stern ,shallow free board light and super fast. 120+++MPH. Basically a stealth wing with an outboard on the back! lol

**freeebird** · 02-15-2017, 01:14 PM

Originally Posted by whipper

Just looking at these two pics side buy side there are differances I can see that would benifit the V21 in higher speeds. One of the reasons the GT20 {probably} gets flighty would be the flared bow farther forward than the less flared bow of the V21. The V21 also has a more raked shape down the chines. At the Stern the V21 is more flared out from the keel line with a more straight edge to the rub rail. That in combination with the more swept back profile helps the V21 to fly at a higher speed with a more aerodynamic shape than the GT20. The GT 20,s big frontal area though would help her to fly at a reasonable High speed with less power isn't really the shape of choice for really high speeds like above 100mph. Also the stern area of the GT 20 were the flare from the keel to the rub rail comes out is more rounded. This looks nice and has some flying function but not as aerodynamically efficient as a wider flare and straighter edges. The best example on any Vee Bottom boat made today is the Allison RR. Very small very swept back frontal area, super wide wing flared stern ,shallow free board light and super fast. 120+++MPH. Basically a stealth wing with an outboard on the back! lol

That all makes perfectly good sense, especially the part about being designed to go fast (lots of lift) with less horsepower. There weren't many motors back in the mid to late 70's that could even push that boat to 100, so it makes sense they wouldn't be designed with that in mind. The XR2002 that replaced it took care of that issue when higher horsepower motors were available. Like I said, I've always liked the way the Triad looks.

**skewby** · 02-15-2017, 01:35 PM

gt20's designed in the mid 70's with tower of power in mind with what 150 hp? when was the v21 designed? that would put a lot in perspective pauls design was the the fastest when new. then came the xr2002 then the grand sport. those 2 hulls in my guess are were built when the v21 came out. if so i'd put my money on the xr or the grand sport with the same power

**freeebird** · 02-15-2017, 01:53 PM

Merc V6's had been out for a little over a year when the first GT20 arrived, but Paul may well have designed it around the inline 6. Don't think it was truly designed as a race boat though. I have an article around someplace to that effect.

**JBS** · 02-15-2017, 06:12 PM

That blue RR is a pretty boat.I just can't fit in it!

**patchesII** · 02-15-2017, 07:13 PM

Originally Posted by skewby

gt20's designed in the mid 70's with tower of power in mind with what 150 hp? when was the v21 designed? that would put a lot in perspective pauls design was the the fastest when new. then came the xr2002 then the grand sport. those 2 hulls in my guess are were built when the v21 came out. if so i'd put my money on the xr or the grand sport with the same power

The XR2002 was introduced in 83 so I'd guess the design phase was '82-'83, well before the V21. The XR is faster than either the V21 or especially the GS

**JWTjr.** · 02-15-2017, 07:15 PM

The XR2002 was in initial testing stages in 1978-79. I remember Darris testing it with (of course) an 85.

**freeebird** · 02-15-2017, 08:48 PM

I always wondered why there was never a sport/race boat version of the XTB21, especially given there was the XB2002 and XR2002 which shared the same hull. The XTB21 was definitely capable of triple digit speeds.

**patchesII** · 02-15-2017, 08:57 PM

The XR2002 and XB2002 aren't the same hull

**freeebird** · 02-15-2017, 09:45 PM

Originally Posted by patchesII

The XR2002 and XB2002 aren't the same hull

I always thought they were. Had a XR2002 and have driven a XB2002. What's the difference in the hull?

**patchesII** · 02-16-2017, 06:07 AM

XR is narrower and has a wider pad. I'd suspect there are other more slight differences. I've had two XR2002's and both my dad and brother have/had XB2002's. I miss having an XR

**freeebird** · 02-16-2017, 08:02 AM

Originally Posted by patchesII

XR is narrower and has a wider pad. I'd suspect there are other more slight differences. I've had two XR2002's and both my dad and brother have/had XB2002's. I miss having an XR

Interesting. I just always assumed it was the same hull with a different cap as I never measured them. Would have thought the narrower pad would have been on the XR.

I didn't keep my XR that long (long story), but I didn't like the way it rode/felt as much as I did my SS20 or XTB21. It definitely rode rougher in a chop and was harder to drive, but there was no comparison in the performance. I've still found myself drooling over the new ones, but I figure I'll keep my GT forever... or until the new, super secret model is about 10 years old! LOL