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Old Feb 13, 2016, 12:12 PM
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Hi guys, little problem.

I upgraded my yak 130 to 8s. Something seems not right.

Stock freewing powerplant in plane numbers on 6s
2.2kg thrust
102 amps
2315 watts

Now my upgraded 8s powerplant. HET 650 65 1500kv, jetfan 90 ECO rotor in stock aluminum freewing housing. Again, in plane numbers

2.4 kg
88 amp peak, 82 settled
2750 watts

Do these thrust numbers look right? Only gained 200 g or so of thrust, amps are down that's good. Is there a difference between jetfan 90 ECO rotor and non ECO? And, could it be because it's in the stock aluminum housing that it doesn't produce the much higher thrust? Thanks.

Paul.
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Old Feb 13, 2016, 12:36 PM
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Quote:
Originally Posted by pwilk20 View Post
Hi guys, little problem.

I upgraded my yak 130 to 8s. Something seems not right.

Stock freewing powerplant in plane numbers on 6s
2.2kg thrust
102 amps
2315 watts

Now my upgraded 8s powerplant. HET 650 65 1500kv, jetfan 90 ECO rotor in stock aluminum freewing housing. Again, in plane numbers

2.4 kg
88 amp peak, 82 settled
2750 watts

Do these thrust numbers look right? Only gained 200 g or so of thrust, amps are down that's good. Is there a difference between jetfan 90 ECO rotor and non ECO? And, could it be because it's in the stock aluminum housing that it doesn't produce the much higher thrust? Thanks.

Paul.
Hi Paul,

I have no experience with the Freewing housing, but it's probably too big for the ECO rotor, Those rotors are turned down to fit the HET 9503 housing, which are smaller than the standard, Jetfan carbon housing.
You are probably losing thrust due to excessive tip clearance.

If you still want to use that rotor, get a HET 9305 V-2 housing that will accept the 39mm motor you have.
The motor should be run ar 0-6* timing (6* is ok for the 700-68-1500 on 8s,)
PWM: 12

You should be seeing about 100-105A installed in the jet.

My Freewing F-16 flies with very good power with the standard JF90/700-68-1500 on 8s ( 2x 4s, 60c, 5000's)
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Last edited by efflux RC; Feb 13, 2016 at 12:44 PM.
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Old Feb 13, 2016, 01:03 PM
CoolerByTheLake is offline
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deleted --gary covered it all. -- hope that was spelled right-- just broke my glasses! Can't see squat.
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Old Feb 13, 2016, 01:19 PM
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Paul,
MY error, sorry I misread your motor spec. (as most use the 700 series motors with the Jetfan rotors). you may be using the 650 since it fits your housing?

The only difference in my comments above is that you can use the Standard HET 9503 housing (for 36mm motors) or the V-2.


.................................................. .............
Mark the ECO rotors are machined down to fit the smaller I.D. of the HET housings.
They are not the same dia rotors as the standard Jetfan rotor.

I stopped offering the ECO rotors a year ago. E-jets no longer offers the JF90 "ECO" rotor as well.

Try not to confuse the The 90mm with the JF120 "ECO" that uses the same moniker to express the currunt JF120 as an economy version, since it utilizes a glass filled polymer for the housing, as opposed to a more expensive carbon fiber housing.
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Old Feb 13, 2016, 01:20 PM
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Quote:
Originally Posted by CoolerByTheLake View Post
deleted --gary covered it all. -- hope that was spelled right-- just broke my glasses! Can't see squat.
Ha ha!.....

I was typing while your were deleting.
No worries Mark.
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Old Feb 13, 2016, 01:22 PM
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Gary I didn't know that --both my JF 90's have stock CF shrouds..
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Old Feb 13, 2016, 01:52 PM
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Hi Gary ( efflux)

Hi Gary , what timing and PWM would you recommend for this setup-
Jetfan 90mm HET 700-68-1500 -9S 60c 5000s in a glassed fly fly Mirage?
Thx ,Steve
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Old Feb 13, 2016, 02:10 PM
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Originally Posted by heliclown View Post
Hi Gary , what timing and PWM would you recommend for this setup-
Jetfan 90mm HET 700-68-1500 -9S 60c 5000s in a glassed fly fly Mirage?
Thx ,Steve
Hi Steve,
Since you'll be seeing higher amps on 9s, I'd suggest 0 (zero) motor timing.
PWM: 12
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Old Feb 13, 2016, 02:42 PM
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Thanks guys! This explains it, I bough the eco rotor awhile back. I did notice a bigger gap than usual, so I'll be buying the regular rotor now.

Paul.
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Old Feb 13, 2016, 03:06 PM
CoolerByTheLake is offline
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Aside from the rotor gap,, why didn't you go with the 700-68-1500?

I just tested the Kv's on mine the other day-- I was happily surprised

it came out at around 1550Kv . Mine is going into a Flyfly F-86 -- should have some great performance on 8s-- And the plan is for full ducting too!
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Old Feb 13, 2016, 09:02 PM
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Quote:
Originally Posted by CoolerByTheLake View Post
Aside from the rotor gap,, why didn't you go with the 700-68-1500?

I just tested the Kv's on mine the other day-- I was happily surprised

it came out at around 1550Kv . Mine is going into a Flyfly F-86 -- should have some great performance on 8s-- And the plan is for full ducting too!
Well I saw Jepe Jets guy getting some awesome thrust numbers with the 650 68 1500 so I followed him. That's the only reason really

Paul.
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Old Feb 13, 2016, 09:14 PM
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Thanks Paul.

FYI, Jepe Storm is a Jetfan "ECO" rotor in a HET 9305 housing.
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Old Feb 14, 2016, 10:35 AM
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Looking forward to the rotor Gary

I took out the shrud getting it ready for the new rotor, I measured approximately 1.5mm gap between the blade and the shrud with the ECO rotor. Just looking at it does seem excessive.

Paul.
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Old Feb 14, 2016, 05:10 PM
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Its hard to see fan gaps in photos, can you measure it? Some auto feeler gauges work well for this. Even if it was 5mm it wouldn't kill your thrust as much as you are saying. What is the exhaust diameter in the model? Could be a ducting/install issue too.

Your amp draw is about right for the JF90 rotor with the 650-68-1500, a little lower than with the tighter fitting GRP housing. This page will show you what to expect from this setup on the bench: http://www.extremerc.com.au/estore/i...oducts_id=1424

If you want to go with the Glass reinforced housing I can help you out with one.
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Old Feb 14, 2016, 05:13 PM
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I don't use 0 degrees timing with the HET motors, 5-7 degrees is what I run with all my setups, 12khz is ok, no higher. ESC choice plays a big part with hotter setups, I have had quite a few customers experience stuttering from cheaper ESC's that cannot keep up with the motor.
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