RunRyder RC
 6  Topic Subscribe
WATCH
 1 page 1968 views POST REPLY
HomeTurbineAircraftHelicopterTurbine Helicopters › Jakadofsky
01-15-2009 12:08 AM  9 years agoPost 1
fredd

rrApprentice

UK - London

My Posts: All  Forum  Topic

hello,

i'm trying to obtain a few information on this turbine for a possible Lama project.

1) Is there a governer mode such as with jetcat engines? Does it work well ?
2) Is there an option for Kerostart (as with Jetcat). Does it work well, require any special tweaking or change of the ECU ? Can you get that option at the time of purchasing the turbine ?
3) For those of you with the big Lama, when going from 2 blades to 3 blades, did you need to change the gearing in any way (at the turbine or mechanics) or kept using the same RPM ?

Thanks for the help.
Frederic

PM  EMAIL  GALLERY  Attn:RR  Quote
01-15-2009 11:35 AM  9 years agoPost 2
Héli Suisse

rrApprentice

Geneva Switzerland

My Posts: All  Forum  Topic

Hi Frederic,

I'm in the very same situation as you're. I'll built a very large Lama in the future, and I'm asking the same questions.

As far as I know, the Jaka is not equipped with a governor, only the JetCat are. But I might be wrong.
Kero start should be available also when purchasing a new turbine and it should work quite properly.
I have no clues regarding the clutch gear.

I think the best is to ask Peter Wales the great!

Good luck in your Lama project!

Héli Suisse

PM  EMAIL  GALLERY  Attn:RR  Quote
01-15-2009 12:21 PM  9 years agoPost 3
Jack Martin

rrApprentice

AKA HeliJack, Washougal, WA

My Posts: All  Forum  Topic

Hi Guys,
I fly a Jaka, an RS, not the super fancy version. You have choices for setting the RPM of the turbine in the ECU. I prefer to let the turbine breathe at it's maximum RPM and use different clutch gearing to get the desired RPM. Al at Starwood sells a clutch specifically for the Lama. Kero start is an option.

The ECU for the Jaka has setting for maximum RPM and you can set it lower if you wish. There is no need for a governor, as the ECU keeps the RPM at speed, even with multi and hard collective input.....It also has a set spool up time, mine is about 40-50 seconds from idle to full RPM.

I believe, but not sure you can even retrofit the kero start into the older ones.

Remember our Veterans.

PM  EMAIL  Attn:RR  Quote
01-15-2009 01:37 PM  9 years agoPost 4
Havoc

rrElite Veteran

Ky.

My Posts: All  Forum  Topic

I haven't heard of Kero start for the Jakadofsy. It is governed. You can run it up with the blades off. Mine is the Pro which has a default RPM of 93000. I turned it down to 91,000 to get the headspeed under 1000. It is set and forget. I have a flat line throttle at idle for Normal mode. Flat line full throttle at idle1 and idle 2. Safety switch on gear. Startup just involves turning everything on, opening the propane bottle, turning off the safety switch, move from normal to idle 1 and back. The turbine spools up to idle. Switch from normal to idle and it runs up to full rpm. You know you are at full rpm when the light goes off. Fly around. Spool down via the idle switch or shut down via the safety switch.

PM  EMAIL  GALLERY  Attn:RR  Quote
01-15-2009 01:44 PM  9 years agoPost 5
Peter Wales

rrElite Veteran

Orlando Fl

My Posts: All  Forum  Topic

Jack has covered most of the questions.

You should set the turbine to its maximum, which will depend on which version of turbine you have. That way you have maximum power available. Then you select the clutch bell gears to give you the right headspeed. The turbine speed only varies if you overload it and it starts shutting down due to overtemps

I have a kerostart on one of my LE's. Its kinda big and sticks out some which may spoil the look in an open engine model like the Lama. I bought it a long time ago from Orbit and it needed a new ECU to go with it. I would imagine you could buy it when you bought the engine now, it's been around a long time.

Both the 2 blade and 3 blade heads run at the same rpm so you stick with the 24 tooth clutch bell on the Pro 5000 or 25 on the Pro Edition for 850 rpm on the head

Peter Wales
http://scalehelicopters.org

PM  EMAIL  HOMEPAGE  Attn:RR  Quote
01-15-2009 09:20 PM  9 years agoPost 6
fredd

rrApprentice

UK - London

My Posts: All  Forum  Topic

Thank you all for the help. It looks as I will go ahead but stay away from Kero-Start.
Frederic

PM  EMAIL  GALLERY  Attn:RR  Quote
01-16-2009 08:56 PM  9 years agoPost 7
fredd

rrApprentice

UK - London

My Posts: All  Forum  Topic

As it is, I have a few more questions on best practices around gas start ...

1) Do you prefer the on board canister or use an external one for safety. It lools like the Jaka has a clutch which may mean you can use an external canister for start-up, then remove external canister, then go from idle to full power ?

2) If you use the on board canister is it better to try to empty it once the turbine has started (Jetcat has an option for this I belive).

3) For those in the UK, any recommended gas mixture that works in the winter. Any specific fittings, festo valves needed.

4) anything else I should know...

Thanks again.

Frederic

PM  EMAIL  GALLERY  Attn:RR  Quote
01-16-2009 09:35 PM  9 years agoPost 8
Red Machine

rrApprentice

Leeds - Yorkshire

My Posts: All  Forum  Topic

PM Sent.

Formart EC120 / Cine Scale Gazelle / Vario MD900 / Turbine Bell 407

PM  EMAIL  GALLERY  Attn:RR  Quote
01-16-2009 09:44 PM  9 years agoPost 9
Havoc

rrElite Veteran

Ky.

My Posts: All  Forum  Topic

Just a side question. Why do people reply "PM sent". Is the big red flashing PM beacon at the top not enough of an indicator nor the email notification? Or do you just want everyone else to know they are out of the loop? Not busting balls, Just asking.

PM  EMAIL  GALLERY  Attn:RR  Quote
01-16-2009 10:26 PM  9 years agoPost 10
PETER ROB

rrElite Veteran

Devon UK

My Posts: All  Forum  Topic

Winter gas start
Fredd, My winter starting (PHT3) has always been a bit hit and miss the colder it gets, especially with the small on board gas bottle, it did not matter what gas mix I used
In the end I dispenced with the on board bottle, kept the main container under my jacket until I needed it gave it a good shake, got a lot of first time starts, and did not have to vent the gas bottle, some thing I never did anyway
Would have sent a PM, did not want to leave Havoc, out in the cold
Peter R

PM  EMAIL  GALLERY  Attn:RR  Quote
01-16-2009 10:54 PM  9 years agoPost 11
Havoc

rrElite Veteran

Ky.

My Posts: All  Forum  Topic

No don't worry about me, I'm used to it. . I haven't bothered to fly much of anything in the winter but I thought the percentage of butane in powermax was supposed to prevent much fuss. I know its not easy to get everywhere. I had to order a twelve pack to get it shipped here.

PM  EMAIL  GALLERY  Attn:RR  Quote
01-16-2009 11:58 PM  9 years agoPost 12
bcm

rrApprentice

Tuolumne,CA

My Posts: All  Forum  Topic

peterrob,

Ive found its better to not fill the onboard propane cylinder completely. I've been told that the onboard cylinder should be mounted at 45 degrees, that allows the largest surface area for the liqiud to be converted to gas. Just repeating some ideas.

PM  EMAIL  HOMEPAGE  Attn:RR  Quote
01-17-2009 12:27 AM  9 years agoPost 13
Peter Wales

rrElite Veteran

Orlando Fl

My Posts: All  Forum  Topic

I leave the gas in the cylinder. If it's going to leak, it will come out in flight. I started my Lama up recently with gas still in there from August. My Cylinder is vertical and I fill it.

The option to empty it is more useful if you are flying a jet airplane into the ground. It will reduce the chances of an explosion.

The Jakadofsky always starts first time if there is enough gas and electricity. It is the most reliable consistent turbine I own. If its warm enough to fly, butane/propane should be enough to get a consistent start everytime.

The clutch means the rotors will not start to turn until you go to idle up/full power. Then it will spool up slowly in a very realistic manner.

Peter Wales
http://scalehelicopters.org

PM  EMAIL  HOMEPAGE  Attn:RR  Quote
01-17-2009 12:32 AM  9 years agoPost 14
PETER ROB

rrElite Veteran

Devon UK

My Posts: All  Forum  Topic

Filling on board gas bottle
bcm, Agree with what you say about not filling the on board container,
But it is not easy to judge what the gas level is within the container
As for the tilting of the container, the volume of gas to liquid will not change by tilting the container, or does it?
Peter R

PM  EMAIL  GALLERY  Attn:RR  Quote
01-17-2009 12:49 AM  9 years agoPost 15
fredd

rrApprentice

UK - London

My Posts: All  Forum  Topic

Thanks again. Seems a really well engineered piece of equipment.

PM  EMAIL  GALLERY  Attn:RR  Quote
01-17-2009 09:16 AM  9 years agoPost 16
RUFFYB

rrNovice

HERTFORDSHIRE UK.

My Posts: All  Forum  Topic

I think most people underestimate the jakadofsky engine.
It has no belt issues, a lifetime warranty on the internal
gearbox and it also one of the best sounding engines as well
I always use an external gas bottle straight into the gas valve and never use the onboard can.

Fredd,
i have three of the little suckers one in the vario lama.
If you want to come up and see a jakadofsky engine or the lama
(it's in bits now for painting) you are very welcome. I am not
far from you.

Regards, Gareth...

PM  EMAIL  GALLERY  Attn:RR  Quote
01-18-2009 06:50 AM  9 years agoPost 17
gonzalom

rrVeteran

Northern California

My Posts: All  Forum  Topic

I simply love my Jakodoski turbines..... over 100 flights on my Lama and never had a single issue.... nothing.... They are the Porsche of RC turbines. Incredible quality. I do have JetCat too on the plane.... very good but quality wise the Jako is superb!

Gonzalo

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
WATCH
 1 page 1968 views POST REPLY
HomeTurbineAircraftHelicopterTurbine Helicopters › Jakadofsky
 Print TOPIC  Make Suggestion 

 6  Topic Subscribe

Tuesday, June 19 - 4:16 am - Copyright © 2000-2018 RunRyder   EMAILEnable Cookies

Login Here
 New Subscriptions 
 Buddies Online