The maths is indicating 97mph on 4s.

[Speed2]

I had a video done with pursuit. I had the video play on one phone, I had a stopwatch run on a another phone, then I video taped the two phones with another phone and uploaded the video. I took some measurements of the area where the boat was running. The area of focus is 5.3 seconds on the stopwatch into the video to 7.3 seconds on the stopwatch into the video. That section measured 286 feet. So according to the video and the stopwatch the boat covered a 286 feet section in just 2 seconds. Which works out to 97mph.

Here is the video https://youtube.com/shorts/W3BhH3jK2...BqW_ebQHIhXtTZ.

This boat is on 4s, with a leopard 4092 2080kv, a osc raider 150, smc 6200 srd battery and a 50mm prop. Other mods were made. Like shorter rudder, reforcing of the bottom of the boat.

[fweasel]

Still extrapolating speed from phone videos... it's an entertaining exercise.

[Speed2]

One day I when the had bouys in the water, I stick tree branches in the sand to be parallel with the bouy in the water at one end and the other end. I took picture and even did a video with a boat running the stretch.

I then went home and studied the video. I paused the video and slide the timer bar to the start buoy. I positioned the boat where I was able to use a ruler to connect the tree branch on the land to the buoy in the water while have the boat intersect between the branch on the land and the buoy in the water. I did the same thing down on the other end.

I did all of that to learn how to read the position of the boat in relation to the land.

I also took measurements on the land to know the distance the boat travelled. I did that for the location that you probably saw in the video.

I used 3 phones to do my calculation. One phone have the original video playing, the second phone have the stopwatch running and the third phone is used to video tape the video on the one phone and the stop watch running at the same time.

With the video that was done with the two phones. I am able to pause the video and slide the boat to the desired starting point, note the stopwatch time. Then slide the boat to the desired end point, note the time on the stopwatch.

Having times from the stopwatch and the measured distance. It is easy for me to know the time it took for the boat to move from point A to point B. Then having the distance, I would divide the distance covered by the time taken to cover the distance, then divide the distance in feet per second by 1.466 to calculate the speed in mph (mile per hour).

[Speed2]

I went up on the beach and remeasured the area that the boat covered in the video. I measured the beach with a manually method and again using my gps.

It turns out that the gps measurement was significantly shorter than what the area actually is. Reason why the gps reading was significantly less than what the boat was actually doing.

The boat was actually covering 174 feet in one second at it max which translate to 118.69mph. And this was accomplished on 4s with a leopard 4092.

The maths does not make sense but the video was not edited and I thoroughly measured the area to make sure the measurements was correct.

[Speed2]

For reference the section from 6.35 seconds on the stop watch to 7.35 seconds is 174 feet.

[vvviivvv]

What are you trying to achieve?

I think if you put a GPS in you'd see speeds closer to 50mph... and be much more accurate. From the video / your setup it's pretty obvious the boat isnt doing anywhere near 100mph

Here is my L12 (6s / side) 2200kv+ boat (albeit on 5 year old lipos as my new ones didn't arrive) running exactly one of the speeds you quoted 118mph through the calibrated speed traps at the Munich saw. https://www.youtube.com/watch?v=o_TWfkP0QV8

From your video I would say there is a lot of parallax error... yes 286 feet in 2 seconds is 98mph

But.. 286 feet in 2.5 seconds is 78mph if that time is actually 3.5 seconds we are down to 55mph...

Accuracy is highly important.

[Speed2]

From the start of the video to the end is 480 feet. And I had just squeeze all at the start so the boat was nowhere max speed at the begining of the footage.

The section I am using as reference is at 6.35 seconds on the stopwatch timer to 7.35seconds. That section is 174 feet out of the 480 feet.

[Speed2]

https://youtube.com/shorts/hAs1fNuOtPM?si=CTXxPCq-NmIZv7r7

In this video these boats are racing over 370 feet from start to finish. I was sailing the yellow boat, the area where I sqieeze full throttle and the rooster tail went up is 370 feet away from where we back off. You are looking at 2 boats that covered around 320 feet in 2 seconds after the got up to full speed. The both of them was using 4s. The yellow boat had in a leopard 4092 2080kv.

[vvviivvv]

So again you are suggesting 109mph?

Like I discussed earlier in my post you need to be deadly accurate over such small distances to accurately get the speeds. I do not think your measurements are anywhere near accurate,

[Speed2]

https://youtu.be/r0x1tFi6fgg?si=BfNUJBFjHBkVtxhG

This is a video of the same pursuit when it was much slow running across the same area that the race took place. The race started a little further back. The pursuit in the video is sailing around 350 to 360 feet from the one side to the other.

I myself could not believe the speed that I am claiming. But the measurements was done thoughly. And I did a few different things to varify that the video was accurate and that the stop watch timer could be trusted.

Just for your reference it took a zelos with twin 4074 2000 kv on 6s with high rake 45mm props to beat my pursuit using 4s with a 4092 2080kv leopard. We did 2 races I won the first race and the zelos won the second.

They is another pursuit that's was matching my speeds. It had in a lehner 2240 5 turn, with a castle hydra xlx, 4s smc srd 8600 4s and an octura x447. That have 2954kv loaded.

Those were heavily handicap that I was in, and I won 2 out of 3 races.

So it takes boats with saw setups to compete in speed with my oval racing setup.

[Speed2]

https://youtu.be/W9p7cwIcuMw?si=_jINsYzJC70zYM5g

This video I think give a clear picture of the area that I refered too. In the first video in the thread, I sailed a longer distance than what the guy sailed in this video.

And the distance that I claimed my boat covered in 2 seconds was very close to the buoys westward on beach to the buoys eastward close to where the camera man was in this video.

[Speed2]

https://youtu.be/dpp8JK1NS1k?si=-cIe3LeTL_HkmOTY

This is the best video that I found, which illustrates the distance that I claim is 324 feet.

At the start of this video you will see a guy standing close to a tree in the area where the zonda roostertail started.

From the area where the zonda roostertail started to the area where the boats sailed and slowed down to turn is 324 feet. The first video in the thread show my pursuit running that section in 2 seconds. 5.20 seconds on the stop watch to 7.20 on the stop watch.

https://youtube.com/shorts/W3BhH3jK2Fw?si=HWBqW_ebQHIhXtTZ

Here is the video for reference.

[kfxguy]

I had a video done with pursuit. I had the video play on one phone, I had a stopwatch run on a another phone, then I video taped the two phones with another phone and uploaded the video. I took some measurements of the area where the boat was running. The area of focus is 5.3 seconds on the stopwatch into the video to 7.3 seconds on the stopwatch into the video. That section measured 286 feet. So according to the video and the stopwatch the boat covered a 286 feet section in just 2 seconds. Which works out to 97mph.

Here is the video https://youtube.com/shorts/W3BhH3jK2...BqW_ebQHIhXtTZ.

This boat is on 4s, with a leopard 4092 2080kv, a osc raider 150, smc 6200 srd battery and a 50mm prop. Other mods were made. Like shorter rudder, reforcing of the bottom of the boat.

sorry, but I can tell you thats not even close to 98 mph. I've got PLENTY of runs that fast under my belt and I can tell you if you put a GPS in it, you'll be disappointed if you this thats 98mph.

heres my 32 cat going 98mph

https://youtu.be/jD8qJuZvqAw

and my V hull going 91

https://youtu.be/4sg2cA57g50?si=aGjkfcpfHXh1tUfw

and another

https://youtu.be/kq3pnh2bYt8?si=QH0D_zxUIJwC5X0w

and heres a 4s run at 102mph

https://youtu.be/kFgDzbXzO5Y?si=rg3IxrnAAXjwSZK1

[Speed2]

sorry, but I can tell you thats not even close to 98 mph. I've got PLENTY of runs that fast under my belt and I can tell you if you put a GPS in it, you'll be disappointed if you this thats 98mph.

Someone posted that they believe my measurements was not correct. So I went ahead and sent supporting videos to give a true picture of how big my running area is.

Did you see the video showing how large my running area is?

I send those videos to show the amount of distance my boat covering in a short space of time, you can watch the video with the stopwatch again to see the time that it took my boat to cover certain section. And watch the supporting videos to get an idea of the actual size of the sections.

From the videos that you posted it looks like the area that you running is much shorter than where I running. And based on the video timer that I am seeing in your videos, its taking along time to cover such a short distance. The lenght of time that I see your boat running, when I sqeeze full throttle from a kralling start, the first second my boat don't cover much distance because the prop does not full hook up. Then the next second my boat does be build so from the 3rd second is when my boat is really close to all. If you watch my video with the stop watch again, at the start of the video, 3.7 seconds that when I squeezed all so in reality my boat was nowhere near its max speed, it is after 5 seconds on the stopwatch when it really start to take off, but guess what from the 3.7 seconds to 7.2 seconds on the stopwatch is a little over 450 feet. Imagine my boat covered over 450 in 3.5seconds and I had just sqeeze all, the prop did not even hookup yet, by the that is around 88mph average and the prop did not hook up.

If you study my videos closely, paying attention to the video illustrating the size of the area, and you study the one with the stopwatch, you should not be speaking the way you do.

For reference, I raced another pursuit with a lehner 2240/5 turn, the one thats rated at 2954 kv loaded, he had the castle hydra xlx, smc srd 8400 or 8600 v3 4s and the prop was an octura x447 or x646 2 blade and we was doing around the same speed. Anybody that knows about lehners would know thats is well over 3000kv unloaded and the lehners are amoung the most powerful motors. So it took a setup like that to compete with me.

Another boat that I raced, a zellos 36 with twin leopard 4074 2000ish kv on 6s per motor, turning some highrake 45mm props. That in my estimation was around the same speed of my boat.

So if you doubt that my boat is doing high speeds, any experience boater knows a zellos 36 with twin leopard 4074 2000 kv's on 6s per motor with abc 1816 equivalent, well tuned should be doing over 100 mph.

And as far as the out pursuit with the lehner 2240/5 turn, anybody who know about rc boats would know, thats a setup only used in a saw competition. And I know they many that does extreme stuff but a lehner 2240 with that kind of kv, I don't see anyone dare trying a x447 on 4s with that kind of kv. And I know you guys know about them smc speedrun and drag v3 lipos and the castle xlx hydra esc.
And the guy that put that together is any extremely skilled and technical.

[fweasel]

sorry, but I can tell you thats not even close to 98 mph. I've got PLENTY of runs that fast under my belt and I can tell you if you put a GPS in it, you'll be disappointed if you this thats 98mph.

Travis, don't feed the trolls. He's a screenshot, ruler racer and holds all of his own world records.