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HomeTurbine✈️Aircraft🚁HelicopterTurbine Helicopters › Spool Up time Jetcatpht3
01-15-2006 03:08 PM  13 years ago
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MattJen

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UK

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Spool Up time Jetcatpht3
Hi All

going from idel to to flight speed what spool up time have you got set ?
Mine is 15 seconds, i would like to change it 30 or 40 more like the full size, is this to much ?

the thing i was thinking was if it did go into fail safe and the mahcine was up at a reasonable height at least 15 seconds it may hve a chance to spool up again and be able to pull out of it,

or the chances are when it does go into fail safe you are gonna have to auto it down anyway

i am just interested what some of you have got as spool up time

many thanks

Matt
All The Best
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01-15-2006 03:32 PM  13 years ago
PETER ROB

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Devon UK

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Spool up speed
Matt With the PHT3 in scale do not try and fly off the stick, fly like full size, in idle up, set your idle up 1 and idle up 2 at 100% on your transmitter, then get your self a good pitch curve, nothing too drastic you will not need a lot of negative just enough to give you a good rate of descent on a windy day ( remember you will get a lot more lift from the wind with a multi blade head) and some where around 8-9 degrees top end for flying and the best you can get in Hold in case you have to auto, in 18 months of flying my EC135 I never had to auto once, I think you will find that the max spool up is 20 sec, after your turbine has started it will tick over at 30,000 revs push your stick to just under hover or at 0 degrees and flick into idle up wait for spool up and go fly,reason for setting idle up the same in 1 and 2 is in case you flick your switch through into 2
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01-15-2006 04:17 PM  13 years ago
Peter Wales

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Orlando Fl

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Once the turbine has gone to idle, you have no chance of bringing it back up to flying speed while it is still in the air. If you get anywhere near and start loading pitch on, then the turbine will overheat annd shut down again, so forget getting out of it with a fast spool up.

Like my namesake, I have never had an auto with a pht3, a very reliable turbine. The one thing is does not do is to ramp up slowly like the jakadofsky, so you have two choices, set the ramp up to maximum and go with it, or put the throttle on a pot or slider and ramp it up manually.

My 135s are left as stock and I just whack the throttle up to full and let it ramp up in its own good time. The problem with the 135 and messing around on the deck is that you are using valuable flying time and with only one tank, my flight timer is set to 4 minutes. The one I have over here has 2 tanks and is set at 6 minutes but I dont have much time on it yet with 2 tanks so it may go to 8 as I get more experience.
Peter Wales
http://scalehelicopters.org
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01-15-2006 04:55 PM  13 years ago
MattJen

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As Always Peter

thanks for the easy to understand info, maybe Airwolf can take a leaf out of your book

I did think after reading the instructions that 15 secs was ample enough,

the pitch is setup at 9 degrees top end with hover around 5 or 6 degrees, Modtron has set it up i am sure he will respond to this post when he sees it,

like you i have heard from many scale pilots the Jetcat is very reliable,

all i am waiting for now is the weather it has been awful over here since xmas,

there is only so much polishing i can do on the hellie

Matt
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01-15-2006 05:48 PM  13 years ago
PETER ROB

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Devon UK

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Melted clutch
CJ You are right I did melt a clutch once on a 5 blade Hughes 500, I was trying to use the Benzine blades which were a lot heavier, and following your advice, spent too much time keeping the 500 just below hover, since then I have followed the advice I have given in the earlier post and not melted a clutch since, as a matter of interest when did you fly a PHT3 turbine, with multi blades other than mine?or Phil S who has the same set up as me?
Matt Like Peter W I fitted the additional tank with header, also I fly with the timer set to 10 mins after I go into idle up, this gave me enough time to land also enough time for another circuit if necessarry,
you will hear of different people saying they get different flight times when they are all flying scale like,there were 3 different gearing ratios available, this makes a lot of difference to flight times, if you check your header tank at the end of each flight you will soon arrive at the best length of time for your set up and flying
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01-15-2006 06:33 PM  13 years ago
MattJen

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UK

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Peter and peter,

i have the following tanks on my machine,

i have the standard vario 1.25 litre blue tank, plus a 540ml header tank,

i am unsure of my gear ratio but i have set my timer for 9 mins,

Matt
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01-15-2006 07:46 PM  13 years ago
PETER ROB

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Devon UK

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Flight time
Matt I had the 2 tanks and Header tank, but like I said earlier keep your flight times short check your tanks after flights and work up to your best flight time then add in a safety margin.
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01-15-2006 08:02 PM  13 years ago
Peter Wales

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Orlando Fl

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Mat
In England I have the same setup as you except my header is a UAT. I switch modes when I go to fly and that activates a timer. The timer is set at 4 minutes and that leaves me with very little fuel in the tank and the header will last 20-30 seconds I suppose. When I get back I am going to try and fit another tank, not that I want to fly much longer, but I would like the reserve.

I would suggest you set a timer when you take off ansd just hover a full tank out 6" off the ground and see how long it lasts. Then set an alarm timer at a safe period to allow you to get down and land under power.
Peter Wales
http://scalehelicopters.org
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01-15-2006 08:29 PM  13 years ago
MattJen

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UK

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thanks again Peter and peter,

Wow i am surpirsed how quick the fuel is guzzeled,

i was expecting 10 mins approx, i will adjust my timer deffinatly to less than that,

thanks again glad you said or my first flight i owuld have been doing an auto

Matt
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01-15-2006 09:59 PM  13 years ago
WIRLYBIRD

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CAPE TOWN / SOUTH AFRICA.

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Run time
Hi Matt,
My NH90 weighs 13.6 kgs ( 30 lbs) on two Lts, I get maximum 13 minutes, therefore set my timer to 11 minutes as I start up, seems to work nicely for me.I think according to your helli's weight you can work out quite easily an interim safe run time,and work from there, but I arived at that time doing much as P/W has sugested, might be the safer way way to go!Of course that is absolutely scale like flying no yanking on the pitch, just being very smooth on the pitch stick.
Let us know what time you get, will be interesting to compare!
Best regards,
Dave.
WHAT GOES UP MUST SURELY COME DOWN.
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01-16-2006 06:43 AM  13 years ago
seattle_helo

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Seattle, WA USA

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Yes, this is very interesting indeed. I'm looking forward to getting my PHT3 in the air to see what kind of flight times I end up with myself.

This is a bit off topic, but I'm curious how much weight effects fuel consumption/flight time. Is lighter universally better or does a heavy model offer other advantages, i.e. greater stability?

nick
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01-16-2006 08:23 AM  13 years ago
PETER ROB

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Devon UK

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fuel weight flight time
Hi Nick it was explained to me this way, the turbine uses a given amount of fuel to run, as you increase the load it has to work harder, using more fuel, as you increase the amount of fuel you carry, the turbine has to work harder to carry that fuel,so by increasing the fuel you carry does not extend your flight time proportionally
1 litre = 6min flying approx
2 litre = 10min flying approx
This is not ment to be an exact scientific explanation, just the idea of how it works, there will be some body who has the formulae to work it out
My conclusion check your fuel levels until you know how long your turbine will fly and have a safety margine
Stability is gained by more than the weight factor
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01-16-2006 12:39 PM  13 years ago
Peter Wales

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Orlando Fl

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My Nats Lama uses 3 liters of fuel in 8 minutes

It weighs 50lb !!!
Peter Wales
http://scalehelicopters.org
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01-16-2006 01:16 PM  13 years ago
Red Machine

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Leeds - Yorkshire

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Just had the fourth tank through my Vario Cobra (internal tanks) and I set the timer for 8 mins. The timer starts counting as soon as I switch the turbine on... which gives me around 7 mins of flying. I tend to bring the model down once the timer starts to sound on the final minute. So realistically I get 6 minutes which is enough for me!

Hope this helps.
1/4 scale Bell 407 / 1/4 scale Hughes 500 / 1/4 scale EC135 / 1/4 scale R44 / 1/5 scale Cobra
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01-16-2006 05:44 PM  13 years ago
PETER ROB

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Devon UK

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Cobra internal tanks
Red You say internal tanks (plural) do you not have the wrap around the engine type tank certainly extend your flying time
Peter R
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01-16-2006 07:04 PM  13 years ago
Dave Hollins

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UK

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Redmachine does have the wrap round tank but he also has the 1/2 litre header tank.

Matt... the PHT3 can have a max spool up time of 20 secs, you should set yours to the max 20secs as it puts less load on the head bolt during spool up.
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01-16-2006 07:22 PM  13 years ago
MattJen

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UK

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Dave

good to hear from you, thans for the post

Matt
All The Best
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01-16-2006 07:47 PM  13 years ago
PETER ROB

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Devon UK

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Back on line
Dave Good to see you are keeping an eye on us Where have you been Not heard anything from you for a while
Peter Robertson
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01-16-2006 08:52 PM  13 years ago
Dave Hollins

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UK

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Hi Peter

Happy new year, hope you are well.

The last four weeks have been really busy at work, I been doing so many hours that my private life has been on hold. This busy period finished at 5 this morning so I can now get on and do some building
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01-16-2006 09:59 PM  13 years ago
seattle_helo

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Seattle, WA USA

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Just to clarify regarding the spool-up on the PHT3, when controlled via the throttle trim slider in single channel ECU operation, can the trim slider be advanced slowly to achieve a slower, gentler spool up?
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