i see some Hydroplane lovers, words like Hydroplaner Hydroplaning etc being used including for and by Roopesh. Well, Hydroplane is a fast fast jet boat, however Hydroplaning AKA Aquaplaning is skidding due to presence of a film of water.

Here is the tech part of it
http://en.wikipedia.org/wiki/Aquaplaning

and this real scary video

highway to hell ( in above video )

so ,do the boats also skid like this , what motors are used in them ?

if you notice the video above there is an interesting revelation that comes to light. Hydroplaning depends not on the weight of the vehicle (If you notice both the truck and the car started to hydroplane at the similar speed). It depends on the tyre pressure. Formula is

1. 9x √tyre pressure in psi= Hydroplaning speed in mph
2. 7.6 x √tyre pressure in psi = Hydroplaning speed in Knots
3. 7.6 x √tyre pressure in psi = Ans x 1.852 = Speed in Kmph

so it is directly proportional to your tyre pressure, it has nothing to do with the weight so it is very important to have correct pressure on your tyres, than to have it lesser

especially during monsoons

Thanks gusty sir,
I always though that Hydroplaning ( skidding  in my terms ) is due to the weight.

here is an example of Hydroplaning being used for display purpose, at this high speed, the aeroplanes tyre will skid, skid force will be so much that you wont be able to sink the tyre easily, this force feedback on the stick will be quite a bit and pilots require only that and a little cheat to maintian water sking going. FIND OUT what could be the cheat is and post it here (it is simple)

The Amazing Spectacle of four T6 Harvard aircraft from The Flying Lions Aerobatic Team, WATER SKIING across the Klipdrift Dam near Johannesburg, South Africa

some images which shows the same clearly, i fyou look a the guys in trail are looking at the leader and not in front. they are touching the water on 'skid force feedback' and maintaining correct distance from the leader by looking at him. 'Close Formation flying is done 90% on feel'

Quote from: rcpilotacro on July 11, 2012, 06:46:08 AM
if you notice the video above there is an interesting revelation that comes to light. Hydroplaning depends not on the weight of the vehicle (If you notice both the truck and the car started to hydroplane at the similar speed). It depends on the tyre pressure. Formula is

1. 9x √tyre pressure in psi= Hydroplaning speed in mph
2. 7.6 x √tyre pressure in psi = Hydroplaning speed in Knots
3. 7.6 x √tyre pressure in psi = Ans x 1.852 = Speed in Kmph

so it is directly proportional to your tyre pressure, it has nothing to do with the weight so it is very important to have correct pressure on your tyres, than to have it lesser

especially during monsoons

My common sense is not accepting this. I admit I don't remember everything so many years after school, so please correct me if I'm wrong. I think what matters here is the pressure exerted by tyre on the road/water. This in turn depends on the weight of the vehicle and area of contact of tyre with the surface. The pressure inside the tyre does have a small role to play as a fully inflated tyre will have smaller contact area. But this change in area is very little. Loading the truck to increase its weight would have much bigger impact than the tyre pressure.

Quote from: rcpilotacro on July 11, 2012, 06:46:08 AM
so it is directly proportional to your tyre pressure,

Should that not be "exponentially proportional"? Direct proportion would be a linear function, I would think.

Gusty ,
I tried that a long time ago with a 40 size tucano  - moment i contacted water the plane just flipped over resulted in a very wet plane.
Learnt my lesson and built a floatplane after that !

If you want to hover fly a heli
If you want to hydroplane drive a boat  
But yes floatplanes are great fun.
I've had a 1/4scale Cub on floats , a Northstar and Aquastar

Mod Edit
fixed your scratch :giggle :

PS
someone fix my giggle

Quote from: RotorZone on July 11, 2012, 10:32:58 AMLoading the truck to increase its weight would have much bigger impact than the tyre pressure.

you are right, it has a role to play, Not much though, since your tyre pressure is so high that to increase pressure to one more PSI load required is quite high also you pressurize the tyre based on your load, you don't pressurize the wheel and then fit it, in fact these trucks have different values of tyre pressure for with and without load (to keep the contact area constant). so yes, weight has an effect, but it is tyre pressure eventually

Sushil sir yeah ! proportionality is expo, with some k value as shown in rep #2

Quote from: xantos on July 11, 2012, 10:58:31 AM
Gusty ,
I tried that a long time ago with a 40 size tucano  - moment i contacted water the plane just flipped over resulted in a very wet plane.

Nandan

You just stole my thunder :headbang:, i was just going to post to the community, does it happen in RC Flying, if yes, what speed will a decent rc jet hydroplane ? and there you are. if you could share the tyre pressure (if it was pressurized at all) and we could calculate the hydroplaning speed

Quote from: xantos on July 11, 2012, 10:58:31 AM
I've had a 1/4scale Cub on floats , a Northstar and Aquastar

When will i get to fly it ?

I have a sham of a Float plane, Thunder tiger Beaver with Floats Got this from Mr Sai Sr (there are two of'em now) (Both the aeroplane and he also sourced the floats for me, Thanks Mr Sai Sr)

Gusty,
I've never experienced the hydroplaning effect as in managing to stay in contact with water fast enough and long enough to overcome the resulting drag
Similarly on the other hand , a float plane is very difficult to unstick from the water surface unless you have some chine strips to break the surface tension.Normally a small wave or ripple is good enough to get the aircraft to unstick and pop it into the air.
If you choose a really really calm day where the water is placid then your takeoff run could be really long.
By the way I've seen some pics of the Piper Cub with the All Terrain Wheels doing this hydroplaning thing.
Maybe the size of the wheel(dia) and the surface area presented to the denser medium has something to do with the hydroplaning capability

i thought some car guys will jump to this thread, well here it is, slash 4x4 using this Hydrodynamic Lift in flying over water, 365 feet, awesome

so if any car guy wants to try this, you need hydrodynamic lift to happen at much lower speed, so if you have a inflatable tyres try lower pressures or choice of softer tyres, try those, whenever this Hydrodynamic lift equals weight you will fly

The video is pretty cool! btw, great information sir.

Quote from: rcpilotacro on July 11, 2012, 11:46:33 AM
so yes, weight has an effect, but it is tyre pressure eventually

Well,  I think given a contact area, weight makes a difference to the speed at which hydroplaning occurs. Tyre pressure will not make any difference. I'll see if I can find any material to support my thínking.