32" hotr 90+mph

[m4a1usr]

I made the first test run. I didn't make 90 but i didn't think i would on the first run. I balanced it to my genesis and was way off. I will made some adjustments and give it another try. I don't think i will have a problem getting to 90, this thing is fast.

Since you are running in a narrow straight canal you have the perfect opportunity to see the true speed you are running at. GPS readings will not impress anyone who knows how GPS works. They are subject to far too many variables to trust as a bonafide reading. You need to use a couple friends with stop watches and 2 bouys. Then you will have a reliable measurement method. Its not perfect, but its far more accurate then any handheld GPS unit. I bet you see a difference right away. I know I did once I started using the bouys. Typical error rate is about 10% but it can be higher.


You still have the fastest looking HOR cat I have seen on video yet!

John

[m4a1usr]

I dont think when it flip it was at top speed. Maybe the first run of the video was the top speed.

When using the max speed measurement on a GPS unit the software doesnt care if the speed is in any one axis. Since that measurement is based on a acceleration calculation if any one of the 3 axis is moving at a faster rate then say the other 2 axis it uses that one value during its sampling. Thats why its prone to such errors. Its not reliable in the form we use it for. Move another knotch up the GPS quality ladder and you will see why they use differential recievers for things like moving vehicles. Aircraft/Boats/Bomb Guidance.

John

[Howard Lee]

This is only my 1st test run. Give me a little time and you can have a state trooper radar me if you like. This is the new 500 gps, garmin said it 100%.

[Howard Lee]

I made some changes in the setup but its raining now. If it stops i will go out for another run.

[DISAR]

When using the max speed measurement on a GPS unit the software doesnt care if the speed is in any one axis. Since that measurement is based on a acceleration calculation if any one of the 3 axis is moving at a faster rate then say the other 2 axis it uses that one value during its sampling. Thats why its prone to such errors. Its not reliable in the form we use it for. Move another knotch up the GPS quality ladder and you will see why they use differential recievers for things like moving vehicles. Aircraft/Boats/Bomb Guidance.

John

I agree. The boat must run straight only, no flying no swift-sudden turning.

Howard this is a general comment and not particularly for you.
Honestly the boat handles very well considering also the water condition.

[Howard Lee]

I agree. The boat must run straight only, no flying no swift-sudden turning.

Howard this is a general comment and not particularly for you.
Honestly the boat handles very well considering also the water condition.

Maybe your right, them were the last 3 run of a 1 hour i spent adjusting the weights to get the balance right. The batteries were at 3.71 a cell on them runs. I will plan another run soon and wait on my wake to pass so there is no flying.

[keithbradley]

Nice vid!

If you do use the GPS, you need to bring it in more often so you can take multiple readings. I GPS some of my boats, but I have been GPS-ing cars for a while too. 2 things will consistantly give false readings on a GPS:

1) If it looses satelite signal even for a fraction of a second, the speed will usually jump up

2) In the event of a crash/flip, speed almost always takes a jump up.

This is just my experience. I have gotten some pretty impressive false positives before. After a while, you will just know what to expect, and if its too good to be true, it probably is.

Was there any damage from the flip?
Also, you mentioned your COG was way off. Which way?

[dana]

its funny how all the sudden gps is unreliable when howard shows his top speed. christ guys... when its your gps i bet its right on. nobody wants to believe this guy is getting these speeds. congradulate him already

[JPriami]

Congrats Howard!! :D

[m4a1usr]

its funny how all the sudden gps is unreliable when howard shows his top speed.

Its not funny to me. I have been stating for years that GPS is at best a decent guesstimator. I used to quote my "fantastic" speed claims when I first started FE boating back in 2005. Either GPS or even a radar gun that I played with. The radar gun was most problematic as small hulls do not reflect enough energy and GPS is flat out not reliable without differential receivers for computing the measurements. Thats why differential was designed. To accurately allow the software algorithms to update instead of relying on single data source as input. You dont like the results or the truth? Design a better system. But thats how the real one works in real life.

John

[Howard Lee]

Nice vid!

If you do use the GPS, you need to bring it in more often so you can take multiple readings. I GPS some of my boats, but I have been GPS-ing cars for a while too. 2 things will consistantly give false readings on a GPS:

1) If it looses satelite signal even for a fraction of a second, the speed will usually jump up

2) In the event of a crash/flip, speed almost always takes a jump up.

This is just my experience. I have gotten some pretty impressive false positives before. After a while, you will just know what to expect, and if its too good to be true, it probably is.

Was there any damage from the flip?
Also, you mentioned your COG was way off. Which way?

No damage at all but thanks for the worry. The video look a lot slower then in person. My wife videos from on top of my truck cab, so i think the hight is making it look slower then it is. I have video of my genesis at 75mph and it looks faster then 84 because its videoed down low. Thats my theory but i don't put much thought into it. I think 1 or 2 more test runs is going to tell us all what this top speed is going to be.

[Howard Lee]

Its not funny to me. I have been stating for years that GPS is at best a decent guesstimator. I used to quote my "fantastic" speed claims when I first started FE boating back in 2005. Either GPS or even a radar gun that I played with. The radar gun was most problematic as small hulls do not reflect enough energy and GPS is flat out not reliable without differential receivers for computing the measurements. Thats why differential was designed. To accurately allow the software algorithms to update instead of relying on single data source as input. You don't like the results or the truth? Design a better system. But thats how the real one works in real life.

John

If its off so much then why dose it read the same as my car speedo.

[Jacked1]

I trust the speed! It looked that fast to me.

[keithbradley]

its funny how all the sudden gps is unreliable when howard shows his top speed. christ guys... when its your gps i bet its right on. nobody wants to believe this guy is getting these speeds. congradulate him and stfu already

Check yourself bud. "stfu" is uncalled for, especially when you really don't know what you are talking about.
I was not discrediting Howard, I was simply offering advice. If you GPS enough RCs you will figure it out on your own soon enough, but it never hurts to get a head start on things.
As far as GPS being "all the sudden unreliable"...I have PLENTY of faulty GPS reading in the past, and I accept them:

http://forums.offshoreelectrics.com/...ad.php?t=17258

Howard:

I thought the same thing about the video looking slow. It just looks like its a long way away from the camera. Most of us on here (I think) have seen enough videos to know that its hauling butt.

Well done, looking forward to the next vid

[LarrysDrifter]

Lets not get skeptical over Howards speeds. We all go off our own GPS's,so let him.If you dont believe his speeds,then dont believe it. Let the man have his thread.