39% Krill Katana with Plettenberg Predator 37/6

[Wolf F.]

here some pictures of my 39% Krill Katana (3 meter).

Motor Plettenberg Predator 37/6 with Schulze Future 40.160.

Battery 14s3p Kokam 4000.

Weight including battery 18,2 Kg

Maximum Power 15.750 Watt

you can find a large review in the German magazine FMT, or here the PDF file review FMT (http://www.slowflyer.ch/downloads/fmtkrillkatan.pdf)

[brian94066]

nice! does it fly any different than the gas counterpart?

[sun.flyer]

Wow, I'm GREEN with envy. :)

Tim

[BoneDoc]

Definitely gets the "mine is bigger than yours" nod :D.

[Wolf F.]

nice! does it fly any different than the gas counterpart?

I have same power as Silvestri himself with 212ccm 4-cylinder, but 2,5 Kg less weight.

[Jocke]

Do you have same power?

[BoneDoc]

Uh, I think he said yes :D. Check the previous post.

[Wolf F.]

Do you have same power?

Maybe more. Here a test with the Uni-log system


Wolf

[Jocke]

Nice!

Have you any rpm data with that prop, also have you tested the Predator 37 with "normal" props 2 or 3 blade ?

[mexico]

You list the battery as 14s3p 4000 mah - do you actually mean 14s3p 12,000 mah?

[Ron van Sommeren]

4Ah, according to http://www.slowflyer.ch/downloads/fmtkrillkatan.pdf

[mexico]

How do you divide 4000 mah evenly among 3 parallel packs?

[pmackenzie]

It has to be 12Ah.
300 amps from a 4000 cell would be 75C :eek:
There is also an image in the pdf showing him loading in 3 large packs.

The pack weight is listed as 4800 grams.
So each cell is about 110 grams, about right for a 4000 cell.

Pat MacKenzie

[Wolf F.]

You list the battery as 14s3p 4000 mah - do you actually mean 14s3p 12,000 mah?

yes 12.000 mAh.

in Germany 14s3p 12000 means 36.000mAh.

Wolf

[Wolf F.]

here the Kokam battery 14s3p

Wolf

[Wolf F.]

and charging

[mexico]

Wow. That's a lot of lithium.
Are they 7s packs run in series or are they permanently wired in 14s packs?

[Wolf F.]

Wow. That's a lot of lithium.
Are they 7s packs run in series or are they permanently wired in 14s packs?

The battery is 5.4Kg (Flight-Power) and 4.9Kg (Kokam).

The Kokam battery is much better, less weight and 1200 Watt more as with Flight-Power.

Batteries are permanently wired as 14s (the Schulze ISL 8-936 can charge up to 14s).

Wolf

[DaveKan]

I should have my 37/6 next week

Dave

[Wolf F.]

I should have my 37/6 next week

Dave

in which model do you use the Predator ?

[DaveKan]

I'm thinking 120" Somenized tm Yak 54 . I'm open to suggestions.

Thanks Dave

[DaveKan]

I should have my 37/6 next week

Dave


I did Get the Plettenberg 37/6 last night. I can't believe how small The gap between the stator, and the magnets is. It is much smaller than any other outrunner I have seen. I know this is good for effciency. It also has curved
magnets. The middle of the stator is profiled to increase surface area, and
decrease weight.

Anyways, can't wait to try it.

Dave

[Wolf F.]

I did Get the Plettenberg 37/6 last night. I can't believe how small The gap between the stator, and the magnets is. It is much smaller than any other outrunner I have seen. I know this is good for effciency. It also has curved
magnets. The middle of the stator is profiled to increase surface area, and
decrease weight.

Anyways, can't wait to try it.

Dave

yes, Plettenberg motors have first-class quality.

I have a new battery for tests, Kokam 5000.
I will make a 14s2p 10.000 pack. Only 3.9Kg.

I think a 120" Yak will be fine for this motor.

Wolf

[DaveKan]

Yes 14s2p 10.000 pack is interesting. I have been thinking of some

100cc kits for that size of battery.

Dave :)

[Ron van Sommeren]

... I can't believe how small The gap between the stator, and the magnets is. It is much smaller than any other outrunner I have seen. I know this is good for effciency...Not necessarily. Ironlosses will increase, but copperlosses will decrease (less winds needed for same Kv and Kt). Needless to say that Plettenberg has done the math of course :)

Vriendelijke groeten ;) Ron van Sommeren

[Wolf F.]

here the motor mount of Predator 30/8 and Predator 37/6

Wolf

[DaveKan]

What is the rpm you get with your 37/6. I see you have data logger.

Very nice way to mount motor. How do you attach the carbon fiber

tube to the fire wall.

Thanks Dave

[Wolf F.]

What is the rpm you get with your 37/6. I see you have data logger.

Very nice way to mount motor. How do you attach the carbon fiber

tube to the fire wall.

Thanks Dave

The carbon tube is fixed with rovings to the fire wall.

My new 14s2p Kokam10000 battery from Schweighofer (http://www.der-schweighofer.at/) is ready for testing.

Results will follow soon.

Wolf

[Wolf F.]

What is the rpm you get with your 37/6. I see you have data logger.



RPM with 28,5x13" (3-blade) is on the Ground 6300 rpm, in the air up to 7000


Wolf

[Wolf F.]

here the test results of the new Kokam 14s2p 10.000

Voltage at full power (302A) is 50.0 V.
This is better as my 14s3P Flight-Power 14.700 (49,4V), and the best, the Kokam Pack has 1500g less weight.


Wolf

[DaveKan]

Hello Wolf

I do know that the Thunder Power 5000 Extreame, has cells that are

0.0026 ohms each. In 2p that is 0.0013 ohms. I think thay use the same

cells. I'm still not sure whether I will go 2p, or 3p.

Thanks Dave :)

[Alexzzz]

Is there a flying-video of this plane?

Greetz.

[DaveKan]

I must admit the more I look at 39% Krill Katana, the more I want one.


Dave :cool:

[Gordon]

yes 12.000 mAh.

in Germany 14s3p 12000 means 36.000mAh.

Wolf

Hi Wolf

How many flight packs do you take to the flying field?

Also, what do you re-charge your monster flight packs with at the flying field? How many chargers and what do you power them with?

You would need more than 2 kW available to re-charge a 14S 36Ah flight pack in one hour. The isl8-936 will only provide maybe 6A charge current for 14S which implies that the model will spend a long time on the ground between flights if you only take one flight pack with you.

I'm not being critical - I too want to fly high-power electric aerobats and I am looking for clues regarding how to get plenty of flying during a morning session!

Best regards

Gordon

[Wolf F.]

Hi Wolf

How many flight packs do you take to the flying field?

Also, what do you re-charge your monster flight packs with at the flying field? How many chargers and what do you power them with?

You would need more than 2 kW available to re-charge a 14S 36Ah flight pack in one hour. The isl8-936 will only provide maybe 6A charge current for 14S which implies that the model will spend a long time on the ground between flights if you only take one flight pack with you.

I'm not being critical - I too want to fly high-power electric aerobats and I am looking for clues regarding how to get plenty of flying during a morning session!

Best regards

Gordon

The battery (Kokam 14s3p) has 12000mAh. So you need about 90 minutes to recharge with the Schulze ISL 8-936.

Last year I had 2 sets of batteries. I often did 6 flights per day, even 8 flights are no problem.

Best to use a power supply or a big 200Ab Pb-battery for the charger.

Wolf

[kmp647]

I have heard mentioned here that hyperion is developing a 15s 1500watt charger system for these large electrics, and dedicated 15s batteries with a special balance connector.
http://www.rcgroups.com/forums/showthread.php?p=8317407#post8317407
copied from the thread:
We've thought a lot about charging packs bigger than 12S. In the end, we decided that it really breaks down into two camps, 1S~12S, and 15S(lipoly). That is, there really isn't much need for 13S~14S packs.

And we also decided that 15S applications should have single-unit packs (1P, 2P, and 3P versions) with a single dedicated balance connector. As such, we are now developing a 1500W dedicated 15S lipo / 18S Life system with 110/220 AC Input, and also looking for suitable (read cheap and reliable)generators for field charging. This will allow the lowest possible cost of production, and make the system bullet-proof on safety, we believe...

And we also have some other new items on the way... What I believe will be the most reliable 63v 260A/320A (cont, peak) controllers ever introduced, and 12,000W+ motors to go with those... (and also new 100A/12S and 140A 12S esc,
thats from the thread link above

Hyperion really has some nice chargers and this setup with a generator will be one of the better choices for field charging.

It gets tough when you have 2 12s10is , 2 610i net chargers, and a generator and you still cant charge batteries fast enough!

Kevin

[DaveKan]

I have heard mentioned here that hyperion is developing a 15s 1500watt charger system for these large electrics, and dedicated 15s batteries with a special balance connector.
http://www.rcgroups.com/forums/showthread.php?p=8317407#post8317407
copied from the thread:

thats from the thread link above

Hyperion really has some nice chargers and this setup with a generator will be one of the better choices for field charging.

It gets tough when you have 2 12s10is , 2 610i net chargers, and a generator and you still cant charge batteries fast enough!

Kevin




This can only help make big planes more accessible.

Good news

Dave

[Gordon]

The battery (Kokam 14s3p) has 12000mAh. So you need about 90 minutes to recharge with the Schulze ISL 8-936.
Last year I had 2 sets of batteries. I often did 6 flights per day, even 8 flights are no problem.
Best to use a power supply or a big 200Ab Pb-battery for the charger.
Wolf

Thanks Wolf. Clearly I had brain fade, thinking 36Ah instead of 12Ah!

I'm thinking that a 1kW Honda generator will be the best field power source as my two 110Ah Pb batteries weigh around 32kg each and as I get older they seem to get heavier. The Honda only weighs about 13kg plus a spot of juice, though the MAAS SPS 9400 40A 13.8V psu I'd take along too adds a bit more weight to carry.

I was thinking about going i/c petrol for the bigger models, but electric flight supported by a Honda will be so much quieter!

Gordon

[Rufter]

The battery (Kokam 14s3p) has 12000mAh. So you need about 90 minutes to recharge with the Schulze ISL 8-936.

Last year I had 2 sets of batteries. I often did 6 flights per day, even 8 flights are no problem.


What flying time do you realisticly get out of the 14s2p pack? We are in the process of converting a 3m Aerobatic Models Extra 300 to electric power. Just for flying scale aerobatics, no 3D (small control surfaces :( )