SPEED
 

hi amigos

i logged this speed,
measured on igyro

how accurate is this ?

thanks

RE: SPEED
 

On the UB ? yea, that's most likely fairly accurate. By the time any large plane looks like its actually going fast, it probably doing well over 250 ..


Voy

RE: SPEED
 

no with my UB,

it was with a barf mkII . i mounted a jet central cheetah on it,

i know its overpowered, but fells good that way

adrenaline flows nice. hehe

RE: SPEED
 

Nice! You must have been 'giving it death' as the Bandit drivers here in the UK say when they 'forget to throttle back'! Come over to the UK - we don't have a max speed limit!! :D Any reason why you fitted an iGyro to a Bandit? They fly sweet enough without any additional tweaks. The BARF II is on my wish list - I just fitted the full door set to my BARF I, and that makes a real difference to top end speed. There will always be a Bandit in my collection!

RE: SPEED
 

WOW 453 mate? i need to see the video to believe it xexe!! jesus...

RE: SPEED
 

Those are typical speeds for this setup.. not too high and pleasant to watch. The Cheetah is also one of the nicest sounding engines around, congrats!

RE: SPEED
 

281 MPH!

That's cookin'

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What was Shulmans record speed? I forget. 283 is haulin the mail for sure.

RE: SPEED
 

337 MPH I think

RE: SPEED
 

hi i am removing the igyro from barf to mount it on the ultra bandit i will let you know how fast it is next sunday

place your bets

barf mkII with cheetah or ub with mammoth?

which one is faster?

RE: SPEED
 

Hey Paul,,

I love that combination. I have a Super Bandit with Merlin 140, which is crazy fast. Too fast for me.. if I hold it open..:D

Be aware though GPS is not always that accurate, especially when measuring top speed. I have GPS logging on my Bandit and sometimes I get an unexplained spike in the speed readings. What I think happens is sometimes the GPS signal is momentarily lost, and when it reacquires, it "jumps" to the new position..

Not sure how the I gyro calculates speed, its accuracy must depend upon the number of position samples it averages. If it is only a small sample then the speed could be way off.

Still, it is good fun to play with. Be careful though. (As I know you will :D).. You are well out side what BV recommends for these models..

Roger

RE: SPEED
 

hi roger

on the ub i have pitot speed sensor, i will compare the speeds displayed on the fadec of the mammoth and on the igyro to se how near are each other

i will fly netxt sunday to check this

RE: SPEED
 

hi amigos i did tested with the ultrabandit and yes its a lot more fast

what do you think? i didnt used the mammoth speed sensor to compare,
next week i will do it, to see if the speed displayed are near each other

thanks

RE: SPEED
 

That one is almost without question a sample rate induced GPS spike. Ie, false indication. 354 mph is quite a stretch.

RE: SPEED
 

Does it use GPS? For a GPS reading you would need the whole log file and check the level flights for a sort of avarage. As it states airspeed I assume GPS was not used with the iGyro

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yes it uses a gps sensor. i will use a futaba gps sensor and a jet central speed sensor to compare the speed on three diferent sensors

wll do this next sunday

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I thought iGyro were good stuff but you start to wonder when they state GPS speed as airspeed. [X(][X(][X(]

RE: SPEED
 

I bet it was a nice flight. Try to do the same you did in a r/c club at a higher altitude ASl and you will have a nice suprise! ;)


Congratulations, Enrique.

RE: SPEED
 

yes, that lets you know that science is not their strong point.

Do any of you know how this iGyro unit works. yes I realise it takes a series of GPS position measurements, and then divides the distance change by time to get the speed.
But how often does it do it?? Is it once per second or a hundred times a second, or what???

Then does it take a time-average of speed values over a second or two and display that? ? ? ? ?

Or does it just display the highest recorded individual speed reading (in which case it is usless nonsense)???
In that case highhorse would be right: it just displays a GPS spike, it looks for the worst position error and displays fiction (but clever fiction as it's what you want to hear)

RE: SPEED
 

Agreed, I'd say your average Ultra is doing something like 270mph

I used Eagletree a few years ago in a Bobcat with a Wren Supersport and a Super bandit with a P120. Both these were showing too high but when the data was downloaded you could see what were spikes and what were proper curves. The Super was doing 295mph and the Bobcat was doing 254 mph.

Jason

hi amigosi tested this sat and sun i did 10 fligths and readings were very similar 483 ,484, 489, 482,and 488 kmh

Just checked my P-200 powered Ultra Bandit and it's showing 538kph. Certainly did not look anywhere near that!

http://www.rcuniverse.com/forum/atta...mentid=1962621