beginner Advice

[rooter]

Hi, I have been flying for a while and starting to get interested in turbines. What is a good heli to start with? and where should I go to purchase? Where is a good site to learn about the turbines, starting and such? Besides cost any drawbacks to turbines? Thanks

[rkeith2]

I am partial to the Wren engine and really like the Bergen aircraft -

Take a look at Bergen RC http://www.bergenrc.com to see what you think of the equipment and I have to say and you will also here it on the sites that their customer service is second to none.

You will learn a lot about turbines by looking at the threads here and posting questions as well.

Good luck and happy flying -

Ron

[Gary Travis]

Go with the Bergen, USA made, with the proven Wren powerplant, plenty of parsts and the best support out there. You can't go wrong.
Gary

[Heli_jack]

I am partial to the Jakakofsky. The spool is so much more real, simpler to operate, direct drive. Fuel use is about half of a JetCat, can't speak for the Wren system.

There is nothing wrong with any of the systems out there, find what fits your interests, budgets are about the same, you will need some sort of means of keeping the head speed below 2000 on the Wren. I hear tell they do have a governor in the works.

My only complaint about the Jaka is I want a smaller one for a .60 size heli. These big ones do fly nice tho, That video I have posted is a Jaka, flying around a 30 pound helicopter like it is a Trex. Nice heli.
Jack

[cbergen]

??? "you will need some sort of means of keeping the head speed below 2000 on the Wren. "???

:dontknow

[Gary Travis]

I'm puzzeld also on that one Jack, all you need do is adjust your throttle curve. As on a glow or gasser you just limit the power with the throttle curve.
Gary

[Greg Alderman]

Now I don't mean to drive this down Jack's throat...but a simple throttle curve works great with the Wren...actually seems to work better than with a glow machine in my opinion...because of the slight turbine lag the motor doesn't respond as quickly as a glow engine and seems to keep head speed from screaming...my head speed didn't probably change more that 50 or 60 RPM through out this flight below...

http://www.helifreak.com/viewtopic.php?t=19610

Rooter...yes this is also a shameless pitch for the Bergen Turbine...all the turbines out there are fine machines...but the Bergen is the cat's meow if you want to fly moderate 3D with a turbine...I am no where even close to a great 3D pilot but I feel very comfortable doing every thing I know how to do with my 90's while flying the Turbine...something I didn't when I owned another brand up Turbine Pod and Boom heli...

[rkeith2]

I will have to jump back in a sec and second Greg's comments. I also moved my bird over to he 14MZ for more precise curve manipulation in the spline setup.

It's awesome to be able to bend the curve to stop the overspeed and still pitch up in negative fast when rolling over.

Greg,

Did I mention that I got to fly the turbine a couple of rounds yesterday? :smokin:

[chopper jockey]

what does the AMA have to say about limiting the rotorspeed of a turbine helicopter? :roll:

[heliman53]

AMA requires rotor speed not exceed 2000 RPMs. Craig B

[rooter]

The bergen stuff looks great and the people there seem to be very nice and knowledgable. Now to come up with the cash, although christmas is around the corner. Do you ever see any used ones for sale? Thanks for the replies.

[chopper jockey]

AMA requires rotor speed not exceed 2000 RPMs. Craig B

Does the AMA say how this must be done? for example must a governor be fitted? :?

[Greg Alderman]

CJ...AMA document 510-A (SAFETY REGULATIONS FOR MODEL AIRCRAFT
POWERED BY GAS TURBINES) Page 1, Airframe Requirements, Para 4. states the following:

"For rotary wing aircraft: The output power of the turbine shall be governed such that the rotor head speed does not exceed the manufacturer’s recommended RPM for any rotor head component. In no case may the rotor head speed exceed 2000 RPM."

with conversations with the AMA and also a letter I maintain states that this requirement can be satisfied with a simple throttle curve...

BTW...this Document should be very dear to all AMA Turbine waiver holders...and they should know it like the back of there hand...but that is my two cents...

[chopper jockey]

I thought so. it`s the "governed" bit I wanted clarifying. Although a simple throttle curve makes sense and works well, but when does the AMA see sense? They still have a similar "nonsense" policy regarding the clutch, when nearly all newly developed european two stage turbines now do away with the clutch all together, it`s simply not needed with remote start. :roll: :)

[Heli_jack]

Not shoving anything down my throat. I like having my head speed set period! I have seen the others and they are fine, just more complicated to set up and get right.

A 2000 head speed is ridiculous anyhow, but it is the rule, I bet the blades disentegrate first.

As far as "governed", the AMA does accept a throttle curve to maintain a lower head speed for turbines.

We are getting off the topic.

You have the Wren that with either the Wren or the Bailey gearbox is a two stage that has been used successfully in the Vario Extreme, Vario Benzin, I believe the Predator, and I think I heard of a Robbe done.

Then you have JetCat, and ususally Airstar boom and parts.

There is Pahl, similar to Jaka, I can't think of the Mechanics for them

[heliman53]

The Wren in a Vario Acrabat makes a nice machine as well, Hobby Parts in the UK has a conversion kit for either the benzin trainer or the Acrobat. Craig B

[chopper jockey]

and if it`s big you are after, there`s the Hobbyparts two stage XLV aswell.

[Coolice]

Hey,

Also dont forget the WREN/Century Predator Turbine. Similar idea to the Bergen Intrepid and just as capable in the right hands.

The Predator uses eCCPm control meaning less linkages and more direct control, plus benefits from reasonably priced spares to.
.