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HomeTurbine✈️Aircraft🚁HelicopterTurbine Helicopters › Jetcat engine test
07-17-2006 08:38 PM  14 years ago
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Richard

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Scottish Borders, U.K.

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Jetcat engine test
Hi,

I'm sure I saw a video somewhere of a Jetcat powered heli running without blades fitted. I know that you should not do this with an I.C. Heli. I am just about ready to start up my Powercat for the first time and was wondering if I could do this as I don't want any surprises caused by anything I have setup wrong?

Richard
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07-18-2006 12:34 AM  14 years ago
PETER ROB

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Devon UK

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Richard, Yes you are right HobbyParts posted a video of the wren with kero-start and the JetCat with Kero-start, the JetCat PHT3 did not have blades on as it was just sitting on its test stand, there is no problem in running your turbine without a load as long as it is just to start up,run up to idle and stop again, I would strongly advise against prolonged running without a load
Peter R
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07-18-2006 10:58 AM  14 years ago
Richard

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Thanks for the info, I'm completely new to turbines and just wanted to make sure.

Richard
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07-18-2006 09:46 PM  14 years ago
optikaman

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EnglishTown N.J.

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Richard, Yes you are right HobbyParts posted a video of the wren with kero-start and the JetCat with Kero-start, the JetCat PHT3 did not have blades on as it was just sitting on its test stand, there is no problem in running your turbine without a load as long as it is just to start up,run up to idle and stop again, I would strongly advise against prolonged running without a load
Peter R
Peter why would you have to put a load on a running turbine? they will not over speed if there is no load. there is no issue running your turbine on a bench for prolonged periods.
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07-19-2006 12:57 AM  14 years ago
seattle_helo

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Seattle, WA USA

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Richard, I posted a video like you describe earlier this year. You can view it here:

http://www.scalerchelis.com/albums/..._kero_start.wmv

I've done quite a bit of bench testing, mostly between 33,000 and 55,000 RPM's and it's been no problem at all. Very fun, actually!

nick
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07-19-2006 01:40 AM  14 years ago
PETER ROB

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Devon UK

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optikaman, like Nick you have a PHt3 turbine, try doing the same kind of test with the SPH5 with governor, you will find it will surge and not settle down until you do put a load on, my reply and advice to richard was because he is new to turbines and I did not know which turbine he was referring to, I still think it was good advice, and I would not run my turbines on a test rig at full throttle for any length of time
Peter R
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07-19-2006 06:46 PM  14 years ago
Richard

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Thanks for the replies, I'll try and run my Jetcat PHT3 this weekend and let you all know how I get on.

Richard
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07-20-2006 12:44 AM  14 years ago
Qrrambero

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San Francisco / Bay Area

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Take it easy Richard and take your time.
Advise from someone that rushed a little bit.
Ae
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07-20-2006 09:16 AM  14 years ago
Richard

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Scottish Borders, U.K.

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I will

Richard
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07-21-2006 12:58 PM  14 years ago
Dave O - UK

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UK

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I would suggest you remove the tail blades too... Especially if you have a heading hold gyro.
Hope it all goes well...
Dave
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07-21-2006 11:54 PM  14 years ago
Richard

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Well, I finaly got the Jetcat running tonight with the help of my friend Genty. we had a few minor problems such as spending ages trying to get the gas to ignite. The GSU said the glow plug was fine but infact it was not glowing enough to ignite the gas. A change of glow pug and all was well. I am most impressed!!

One small annoyance is the gas canister trigger assembly does not seem to work with my cans of gas? I am using Taymar / Coleman brand of Butane/propane mix that I have for my plumbing blow lamp. The 3 side clamp fits onto the top OK but when I screw in the trigger it does not open the self seal valve on the can. Anyone any ideas? What is everyone else in the UK using? We managed to fill the Jetcat Gas can by cutting a small grooove in the protruding nipple on the bottom of the trigger assembly and hand holding it at an angle on the top of the tin. I think this is a bit risky! Suggestions on a postcard please!!!

Richard
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07-22-2006 12:04 AM  14 years ago
PETER ROB

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Devon UK

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Gas bottle fittings
Richard go into your local B&Q and buy a plumbers gas torch take off the brass bit where the flame comes out you are left with the gas jet just fit a piece of Tygon over the gas jet and reduce down to fit your filling adaptor the one supplied with your turbine
Peter R
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07-25-2006 08:29 PM  14 years ago
Richard

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Well, I had Powercats fist flight yesterday, I hovered around for two tanks. The palms of my hands were sweating the whole time. It was a bit windy and I noticed when I applied pitch the tail would move. I am using a GY401 with a Futaba S9254, I turned the gain up to 80% which seemed to help. Has anyone else had problems using the GY401 / 9254 setup. Do you think I need a better gyro / servo combination?

Richard
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07-26-2006 12:57 PM  14 years ago
optikaman

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EnglishTown N.J.

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Richard it seems that you are running a head speed that is low.

you need to get the head speed up, 1400 will take care of that issue and try larger tail blades.


Alan
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07-26-2006 01:15 PM  14 years ago
MattJen

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UK / GRAVESEND KENT

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Also

make sure you dont have revo mix on, this will cause the tail to drift,

i personally would not fly it in HH, it stops all that fighting of the servo, as it just drifts into wind unless you put an input in

Matt - newly converted to non HH
All The Best
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07-26-2006 04:10 PM  14 years ago
Richard

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Thanks for the advice,
I will try and increase the head speed to 1400. Am I correct and saying this is done by increasing the Turbine rpm via the GSU?

I'm quite 'green' with operating turbines although this is one hell of a site for finding informaion.

Richard
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08-13-2006 08:19 PM  14 years ago
Richard

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I have read about the speed up gear upgrade and also somthing about drive belt width. Please correct me if I'm wrong? If your PHT 3 turbine has the wide belt fitted it already has the speed up gear installed?

Richard
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08-13-2006 10:07 PM  14 years ago
seattle_helo

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Seattle, WA USA

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Richard, the two can be mutually exclusive, i.e. any recent PHT3 would have the wider belts from the factory but not necessarily the speed up gear. If you bought your turbine without specifying the different gear ratio than I would say it does not have it. JetCat has both 'speed-up' gears and 'slow-down' gears (for scale ships with <1000 RPM head speeds).

nick
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08-13-2006 10:37 PM  14 years ago
MattJen

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you will know if it has the speed up gears, just tach the head at 94000, it should be 1280, if it is higher then you have the upgears.

Mine came back a few weeks ago with the 9MM belt upgrade, but it wont go above the 94K, there are some who know how to overide the 94K and take it to 120K+ but i would not recommend this unless you are an expert on turbines and know what you are doing.

Personally and i cannot give evidnece of this as i fly the HOTCAT, my head speed on a 502 is 1260 my gyro is set on 75% gain in non HH and it holds, it will drift into wind as it is NOT HH, and as this machine is a trainer to leanr scale i am learning to control the tail and fly it properly.ie non HH

Matt
All The Best
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08-14-2006 02:34 AM  14 years ago
Donovan Dow

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Barrhaven Ottawa Ontario Canada

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Evening All

My Power Cat is set at 98,000 but hit 102,700 yesterday.

cheers
don dow
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