100mph Hulls?

[Gary]

Here is the BIGGEST PROBLEM.................When your boat goes 45-50 out of the gate and then you work up to 60-65 that 45 looks like a tug boat moving. When you hit 75-80 that 60 looks like a tugboat AGAIN. It just keeps creeping up and there is no end unless you put a cap on it and say .THIS IS GOOD. LOL I know this is how it has gone for me.

[blackcat26]

How do you say thats fast enough? Speed is very addictive!

[hazegry]

Yeah I am a scale guy coming over to the dark side as it were but I know I dont want to loose boats if I can avoid it. I dont plan on going past 70 at the most. I also dont race I just run for fun now. Racing may come later.

[properchopper]

How do you say thats fast enough? Speed is very addictive!

When the number of air fresheners exceed food items on your grocery shopping list, you'll know !

[m4a1usr]

Well you have to pay to play sometimes. Too bad.

Stuffing normal wouldn't casue a boat to catch fire, so i wonder it the batts came loose and connectors shorted or something else.

TG

You obviously have not wrecked many boats to make that comment. Sudden deceleration or impact will and does cause structural failure where components shift position and become entangled or certainly change locations. As velocity increases so do the forces associated with a rapid decrease. Stuffing a hull will induce forces hundred's of times the normal amount of riding on the surface.

The difference between an aircraft hitting the ground and desintegrating into thousands of pieces upon impact at 100mph and a boat in water is the aircraft impact takes milliseconds. The boats impact, with the same amount of energy (given they are of the same mass and weight), takes many more times the same amount of time. The force is spread out in a greater time frame. Just like slow motion in effect but longer time duration forces effecting masses at rest.

My point is that sudden deceleration can rip out motors, batteries, even your transom can seperate off the hull due to leverage off your hardware like a rudder or trim tabs.

Going fast has many threats besides making things strong enough for acceleration. There is the opposite side of the story.

John

[properchopper]

You obviously have not wrecked many boats to make that comment. Sudden deceleration or impact will and does cause structural failure where components shift position and become entangled or certainly change locations. As velocity increases so do the forces associated with a rapid decrease. Stuffing a hull will induce forces hundred's of times the normal amount of riding on the surface.

The difference between an aircraft hitting the ground and desintegrating into thousands of pieces upon impact at 100mph and a boat in water is the aircraft impact takes milliseconds. The boats impact, with the same amount of energy (given they are of the same mass and weight), takes many more times the same amount of time. The force is spread out in a greater time frame. Just like slow motion in effect but longer time duration forces effecting masses at rest.

My point is that sudden deceleration can rip out motors, batteries, even your transom can seperate off the hull due to leverage off your hardware like a rudder or trim tabs.

Going fast has many threats besides making things strong enough for acceleration. There is the opposite side of the story.

John

John, you're completely right empiracally & I have no arguement with your reasoning. I respect your knowledge totally. Here's the thing, and I say this with all due respect : Your first point (sentence) above is off base. Tyler is one of the fastest, most professional racers on the West Coast ; his fleet of immacuately built IC and FE boats are always in the winners circle and he usually is way ahead of the other competitors . The engineering of his boats [ He's a Mechanical Engineer] is an example to behold, and he knows how to go really, really fast. And I'm certain he's experienced the ravages of sudden decelleration !
I'm not sure I should've jumped in here and really dont want to sound offensive in any way, John, but I have so much respect and admiration for Tyler that I felt compelled to share my feelings.

[Punisher 67]

Hello John..........I have to second propchoppers input on Tyler , extremely professional in his builds . We tag teamed on two mount builds and I am deeply honoured to add Tyler to my list of friends

[Simon.O.]

If you want to go to 100 then go ahead !
I gave in at just shy of 70. My dream was 100mph but when I got to 100+ kmh I was happy and it was all done for me.
This took a lot of work and a lot burnt gear.......just to get to near 70mph with a 4S rigger.

Talk to Paddy (Xzessperated) and see what the quest for a hundy looks like.
Ask Chris Harris how it works too.

I have asked both and know the answer.
A lot of time and more than a few dollars and tears too is part of it.

The quest for speed is admirable but be assured that the cost is exponential and a few more mph will cost a few more hundred at the high end.

Go for it

[ncornacchi]

Didn't the guys once talk about the maximum speed limits (I like to call it terminal velocity) of our boats based on scale, size, design, etc on this forum? I tried to find the post, but at the time I was reading it, and it brought my ambitions down to earth (and saved me alot of grief and heartache).....Now I don't think in terms of the fastest boat ever built, but more like, what's the terminal velocity of this particular model before it just flies or self-destructs and walk on the safe side of that line

[RaceMechaniX]

You obviously have not wrecked many boats to make that comment. Sudden deceleration or impact will and does cause structural failure where components shift position and become entangled or certainly change locations. As velocity increases so do the forces associated with a rapid decrease. Stuffing a hull will induce forces hundred's of times the normal amount of riding on the surface.

The difference between an aircraft hitting the ground and desintegrating into thousands of pieces upon impact at 100mph and a boat in water is the aircraft impact takes milliseconds. The boats impact, with the same amount of energy (given they are of the same mass and weight), takes many more times the same amount of time. The force is spread out in a greater time frame. Just like slow motion in effect but longer time duration forces effecting masses at rest.

My point is that sudden deceleration can rip out motors, batteries, even your transom can seperate off the hull due to leverage off your hardware like a rudder or trim tabs.

Going fast has many threats besides making things strong enough for acceleration. There is the opposite side of the story.

John

John,

It was a "insider" comment directed at Tony as we have both see the boat and how it as set-up. That particular boat I believe had a 40.300 and 3080 with a lot of battery on board. Its heavy and overpowered which makes for rather dramatic crashes.

As for me, I have had plenty of crashes and trashed boats. One good example:

http://vanceman.smugmug.com/The-RCTribe/RC-Boats/RC-Boat-Videos/6672753_ZfUwS#797356097_fXd45-A-LB

The yellow rigger is a one off CMD rigger with a CMB35RS motor. It's about 22lbs with a 11hp motor spinning at 21k RPM. When it crashes parts break!

Both Tony and I are experts in P-mono battery tray design as we have both shared similiar ejection stories chasing records. Luckily none severe enough to warrant burial on the spot.

As for going fast and crashing. I have a purpose built X-Hydro SAW boat that runs 112 to 115mph consistently on a timed course. I have stuffed this boat at 110 mph and only had to retrieve a floating cowl.

No ill will towards ya, just explaining myself.

Tony, Peter,

Thanks you guys, proud to have a great bunch of boating friends.

Tyler

[cybercrxt]

My question is this...Is there anyone even on this forum doing 100mph? I have seen a few riggers at the saw even do 110mph, and one doing 139mph, and let me tell you, the guys running these boats have years and years and years of experience, slowly pushing up the record book. It is to the point now they are happy with .5mph gain over the last record. I have been doing this for a couple years now, and my fastest time is 68.8mph, and hitting just 70mph seems like a leap.

If you are running 45mph now, hit 60mph and you will wet yourself. The difference of that 15mph across water is astounding quite honestly.

I will say this too, doing 100mph in anything other than a specifically built rigger is dreaming in all honesty. Most of those large HPR cats are in the 80-90mph range! Heck, I have seen multiple videos of those $5000+ cats blowing off at the tiniest ripple in the water. Your driving skill and picking the right moment to even run a boat that fast is key.

I don't know, I don't wanna be a downer, but I sure don't wanna blow smoke up your a$z either.

Mike

[RaceMechaniX]

There are a number of us 100+, that said I am sure most of us have toiled for years to get to those speeds. Speed milestones are very much hull/class specific. Getting a p-mono to do 60+ is pretty difficult, getting a p hydro to do 60 is not too hard. A p hydro running 110mph is really difficult.

My hats off to the big scale guys running the HPR's over a 100 mph. I have watch a good number of them run over a 100 regulary with assumed risks. Even crazier is our own Mark Ferrara who has come so close to hitting 100mph with a mono!

Al lot of us have aspirations of hitting 100, its a magical number in the boat world. My only advice is set a goal and work towards it whether it's 40 or 140. The best place to learn how it go fast is to attend a SAW event and talk to the guys there.

Tyler

[Fluid]

There is a big difference between 100 mph on a GPS and 100 mph through the traps at a SAW event. One is just for grins, the other is for legit bragging rights (and maybe a plaque). GPS racing is fun, but it is pretty meaningless when comparing to SAW trap speeds. On a GPS you only have to be at speed for a fraction of a second; SAW traps are 330 feet apart plus the run-up and slow-down.....


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[crabstick]

There is a big difference between 100 mph on a GPS and 100 mph through the traps at a SAW event. One is just for grins, the other is for legit bragging rights (and maybe a plaque). GPS racing is fun, but it is pretty meaningless when comparing to SAW trap speeds. On a GPS you only have to be at speed for a fraction of a second; SAW traps are 330 feet apart plus the run-up and slow-down.....


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GPS IMO is a good tuning tool. some GPS's only have a 1hz gps unit and they dont refresh as often and sometimes can come up with some strange figures if you are turning sharply

Im generally sceptical of GPS speeds unless I see video.
a LOT can happen in 100 meters, specially if you are right on the ragged edge.

[Gary]

My Hydro boat on dead flat water with an Eagle Tree and a garmin 201 GPS on board and with someone shooting with a radar gun would normally run 94-98mph. Now i know that its not a true mph as compared to real SAW events by everyones standerds but i have to say that in my opinion the boat had to be going that fast on its flatout runs only because of three different measuring systems. I would back them up with almost identical runs aswell. As far as crashing.......yes, cracked up boat , motors ripped out, and hatchs ripped off.My Garmin GPS one time punched a hole through the transom and sunk to the bottom of the lake on one of my more spectacular crashes. I could be way off here with speed so who knows. .....................Good Times!!!!!! LOL