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Robbe › Eolo Rotor speed problem
04-01-2005 05:46 PM  13 years agoPost 1
orobin

rrNovice

France

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Hello,

I have an issue, and I will try to explain my problem :

My config is :
Eolo Spirit, with Third bearing option
Twist 37
15 tooth pinion
Lipo battery 3S2P = 5200 mA
Kontronik Jazz 40-6-18
Receiver battery
GY401 - HS 55 servo equivalent.
Carbon blade (SAB)
etc...

When I fly gently, My rotor is around 2100 RPM. at 0°, the rotor is at 2250 RPM.
The maximum pitch is 10°.
at 10°, the rotor is at only 1600 RPM !
all this mesurement where made on the ground.

When I try to do a loop, I have a big problem :
First, because of the lack or rotor RPM at full pitch, when the heli is on the back, it fall down, and is really difficult to crash.
It is like when I fly, to do a loop, the cyclic plate, the back rotor are consuming energy on the motor. because the sound is like I lose more RPM than on the ground at 10°....

The second problem is the the heli is turning, during the loop, because of the lack of RPM rotor.
What I obtain the something like a loop with draw stopper (I don't know the English word, it is a Goggle translation)

Does anybody have made some measurement, on the ground, at can tell me if my config is working propperly ?

what can I do, having more pitch will increase the problem, having less pitch will give me poor climb rate (I have tried...)

I am right ? is the fact that the heli is turning during a loop, the result of the lose of RPM rotor ?

many thank you for any help.

Best regards,
Olivier

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04-01-2005 05:59 PM  13 years agoPost 2
HugeOne

rrKey Veteran

Quebec, Canada

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What is the C rating of your lipo, may be they are not able to pull enought current, do they comes hot?

HS-55 these servo are way too small do you mean HS-81?

Rotate all mechanic on the ground by hand while trying every movement possible with the Tx (collective, foward, rudder...) is everything turning freely at all time?

How are your throttle curve, do they reach at 100% throttle when at 10 degree pitch? Did you tryed governor mode?

Raptor e620 w/V-bar, Tango 45-06, Phoenix 85HV, TrueRC 12S1P 4000mAh

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04-01-2005 07:31 PM  13 years agoPost 3
darrens

rrKey Veteran

United Kingdom

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if your rotor rpm is dropping to 1600 when on the ground at full pitch you should expect that. You are putting the motor under massive load doing this so it will drop. This is loaded much more than in a climb and out of ground effect. If your rotor speed is dropping off at the top of a loop as you go into neg pitch, perhaps it could be your throttle curve is not set up right. Also, check that there is no bindind as described by HugeOne.
Finally, check that the head phase is set up right as this can cause some incorrect aileron input when you pull elevator for the loop. I had that until the head timing was set right.

He who dies with the most toys is the winner!

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04-01-2005 08:43 PM  13 years agoPost 4
orobin

rrNovice

France

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hello,

thank you for the answer.

my throttle curve is flat : 98 % everywhere.
My lipo are Polyqyest Lipo, 2600 mA, 10C - 12C.
Because I have 3S2P, it give me 5200mA.
I should be able to have more than 50A, but in reality, over 40A, the lipo fall down.

at 10° for the pitch, I use less than 28A
at 0°, I use 8A

I didn't notice something wrong, when I was moving the cyclic plate, or anything on the head.

for the back rotor, I was thinking that the servo have to be fast, but not necessary big, and powerfull.
You suggest me a HS81, or equivalent.
is there some servo faster, not too much expensive (and possible to buy from France )

I didn't use the governor mode, because whan I tried it, I had some problem with some radio glitch. so I decided to use only normal mode, with battery for the receiver.

are you using the same pitch range, with the same config (and same pinion) ?

thank you
Olivier

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04-02-2005 08:19 PM  13 years agoPost 5
orobin

rrNovice

France

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Hello,

I just have made some new test today.

I changed my back rotor servo, with a HS81, by a new one. It solved at 90% the problem which made turning my heli, during loops.
The heli is still a little bit moved from his axe, during a loop, but this time, it is minor, and may be it comes from a tuning problem. I will check everything.

I still have a big lose of RPM during climb, loop, flip rolls...
I worry about that. but it works for light aerobatic.

I tried to use 12° as maximum pitch. it is a little bit better.
I used today the 14 tooth pinion.

I have please, some question :

do you do roll easily, with this config, without light paddle ?
My lipo pack weight around 350 gr. do people have more light lipo battery ?

thank you
Olivier

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04-06-2005 05:25 AM  13 years agoPost 6
Stet

rrElite Veteran

Key Largo FL

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I have been disappointed with the eolo performance using twist37, 14T pinion, jazz 40-6-18 and 3S2 P battery 4200mah. I also get just over 2100 headspeed, but whenever I put it through a load I lose headspeed for sure.

I am under the impression that using a 4S battery might improve things, but that remains to be seen. I am considering buying two of the 4S1P new packs from TP and connecting them together in parallel. I can use the noseweight anyway since I have 9253 on the tail.

I am still very fond of the heli, but am looking for a more responsive setup. I had a Lehner 1930-6 on order but it appears that the vendor dropped my order without informing me (lowsy web order forms that may or may not result in a real order make me mad). Now it appears I cannot get this motor which is maddening since I bought a whole set of special pinions just so I could have the correct one (19T) for this motor.

So I too am looking for a stronger setup. Not sure if I should go to a Twist 33, or perhaps a Hacker motor. I will query the community for suggestions. I don't want to go high voltage unless things are reliable and dont run too hot.

The heli is fine doing simple forward flight and such, but if you want power it seems nowhere to be found.

keepin' it real

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Robbe › Eolo Rotor speed problem
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