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Old Oct 27, 2008, 06:09 AM
Crash Test Dummy
Caduceus4's Avatar
Brisbane, Australia
Joined Sep 2006
76 Posts
Discussion
1509/1.5D/6.7 17x18 on 5S = Possible? Sensible? Encouraged?

I've been flying this motor on a Neu 4S-5000 30/60 battery successfully for some time now. ESC is a CC-125. Prop is RFM Blue with zero offset yoke. Throttle on a switch with max 2 sec burst. Ventilation is very well set-up and everything comes back nice and cool.

Steve recently had a sale on his excellent batteries. I've got a 5S-5000 arriving next week. So.........with the above components, is the 5S battery:

a) Possible?

b) Reasonable?

c) Encouraged?

Airframe is an Absolute. I also have an identical set-up in a Kamelot but using a 16x17 prop since I only have one of each prop size. Other options I have on hand are a 15x16 prop, a +5 38mm spinner and a brand new CC-180 ESC. I prefer acceleration and eye-popping climb performance over outright speed.

WSY?
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Old Oct 27, 2008, 07:48 AM
BEOWULF
North vancouver, B.C. Canada
Joined Apr 2008
18,576 Posts
I have the same set up on my Absolute and used 3 cell with 16X17
with 4 cells it would go even faster.

I really am not the one to give advice but having your switch on just for two seconds is not enough time for things to work properly. I do not know the terminology but after a second or two after hitting the switch is when you will get eye popping climb performance and acceleration.

It feels like the battery and propeller just get a sudden burst of energy after a second or two.

when it happened to me I though something was wrong and then I remembered reading about it somewhere on rc groups.
2 seconds is not long enough 5 is more like it hehehe
and why put your switch on a timer to turn off the motor?
spring loaded switch with a timer in your head

1509/1.5D max volts is 13
http://www.castlecreations.com/produ...rs/nm1500.html
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Old Oct 27, 2008, 09:10 AM
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sneu's Avatar
United States, CA, San Diego
Joined Dec 1999
7,352 Posts
Quote:
Originally Posted by David22
I have the same set up on my Absolute and used 3 cell with 16X17
with 4 cells it would go even faster.

I really am not the one to give advice but having your switch on just for two seconds is not enough time for things to work properly. I do not know the terminology but after a second or two after hitting the switch is when you will get eye popping climb performance and acceleration.

It feels like the battery and propeller just get a sudden burst of energy after a second or two.

when it happened to me I though something was wrong and then I remembered reading about it somewhere on rc groups.
2 seconds is not long enough 5 is more like it hehehe
and why put your switch on a timer to turn off the motor?
spring loaded switch with a timer in your head

1509/1.5D max volts is 13
http://www.castlecreations.com/produ...rs/nm1500.html

It goes great with 5S--just be ready for silly power
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Old Oct 27, 2008, 10:56 AM
f5b-uk
Mike Seale's Avatar
United Kingdom, Dorset
Joined May 2002
3,067 Posts
Quote:
Originally Posted by Caduceus4
b) Reasonable?

c) Encouraged?
Reading Steve's comment I'd say it's completely unreasonable but to be encouraged

BTW, your 17x18 blue is not really meant to go on a zero degree hub. You're probably only getting 17x13 on the zero spinner. As such, and considering the silly power comment, I'd use the 16x17 on the zero.

Mike
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Old Oct 27, 2008, 10:57 AM
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steveburns's Avatar
Chipping Norton, UK
Joined Jan 2005
755 Posts
1509 1.5d 6.7:1 G/box, 17x18 red or Green on +5 or +7 spinner and Flightpower 3600 5s1p is what I've got in my Enigma. 2.5 sec motor runs are more than enough and measured peak power is 5200W.

Guaranteed to make you go or or

Steve
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Old Oct 27, 2008, 11:09 AM
Why you swing so hard?
jsnaphook's Avatar
Lake Tahoe
Joined Jun 2006
1,272 Posts
Go for it! I was thinking of putting that setup in my Ab but will opt to install in my Kamie instead. Get video.

Juan
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Old Oct 27, 2008, 12:47 PM
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Lenny970's Avatar
Greeley, Colorado, USA
Joined Feb 2000
2,855 Posts
As Mike said, use the 16x17 prop and keep the run time short - as you have been. I wouldn't trust that blue RFM at that power level.

Good luck,
Lenny
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Old Oct 27, 2008, 01:33 PM
f5b-uk
Mike Seale's Avatar
United Kingdom, Dorset
Joined May 2002
3,067 Posts
Quote:
Originally Posted by David22
2 seconds is not long enough 5 is more like it hehehe
Whilst 2 seconds may not be enough on 3s it quickly becomes too much at silly power. No need to let the motor unload completely or things are going to break at silly power.

Mike
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Old Oct 27, 2008, 05:52 PM
BEOWULF
North vancouver, B.C. Canada
Joined Apr 2008
18,576 Posts
very cool 5 cell in the Absolute
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Old Oct 28, 2008, 12:54 AM
I am actually really slow
SlowBarless's Avatar
Brisbane
Joined Jun 2008
961 Posts
I wanna see this happen, where do you fly caduceus4??

cheers
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Old Nov 02, 2008, 12:58 AM
Crash Test Dummy
Caduceus4's Avatar
Brisbane, Australia
Joined Sep 2006
76 Posts
Silly Power

Well Gents, the Neu 5S-5000 30/60C arrived in the mail this week. Five minutes later it had 6mm bullets soldered onto it and then I realised my charger could only do up to 4S Lipos. So another hundred bucks later and I now have a second charger - well I guess you should always have a spare anyway.

I trial fitted the battery in the Absolute and although it would fit, it was not quite plug and play. Normally, my connectors sit on top of the battery but the extra height would interfere with the wing fit. To get the connectors down the side of the battery would have meant lengthening the ESC leads. So to cut a long story short, I decided to stick with a 4S setup in the Absolute and put the new battery in my Kamelot instead

I flew both planes this morning.

Absolute (AUW 61 oz):
- Neu 1509/1.5D/6.7
- CC-125
- Neu 4S-5000
- RFM 17x18 Blue on +5 yoke

Kamelot (AUW 78 oz):
- Neu 1509/1.5D/6.7
- CC-125
- Neu 5S-5000
- RFM 16x17 on straight yoke

Calculating mAH replaced vs run-time, the Absolute draws about 160A in-flight. Using the same method, the Kamelot draws about 190A. Using nominal pack voltages this is about 2300W and 3500W respectively. Realistically, voltage will be less under load but I don't have a method of measuring this.

Some observations:

The lighter Absolute with the broad 17" prop accelerates like a scalded cat. The prop is relatively quiet with no audible cavitation. Right from the launch, the climb performance is amazing. Top speed is good and it just sounds terrific on a high speed level flyby.

The Kamelot is an animal. The prop used to cavitate on 4S but on 5S you should probably wear hearing protection to launch it - it's that loud. Acceleration from hand launch is not particularly swift and it took an initial motor run of nearly 4 seconds to get to the same height the Absolute seems to reach in 2 seconds. However, once on step, this thing is fierce. Pulling out from a massive vertical dive then hitting the throttle as soon as the nose comes level gives a very quick pass - I'd say a good 30mph faster than the Absolute. And the sound.......oh, the sound. At 7.30 this morning we had about a dozen kangaroos grazing on the strip. One pass with the Kamelot on the gas and they were on the hop faster than if my dog was chasing them.

All in all, a fun morning.
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Old Nov 02, 2008, 03:54 AM
Needs to do 52 legs !!
jjmouris's Avatar
Verenigd Koninkrijk, Fareham
Joined Aug 2008
7,146 Posts
I've flown a 1509/1.5D/6.7 and old CC 125 with 5S TP V2 3850mah with all the RFM props ranging from 14.5x14 to 18x19 without problems.

It will work but at the top end the motor does get hot and it is recommended by me that you only do a short flight of 30-40 seconds motor time maximum and then let it cool down completely before flying it again (30min with no added cooling fan).

Also my 5S pack might have been going south (voltage drop) when i flew it on the 18x19 (is really only 17'' dia on a 36mm 7degree hub) so on your fresh 5S 5Ah packs you might end up getting in trouble regarding motor temps.

Anyway, you will have a lot more fun with this motor on 5S and the RFM 16x17 for sure! The smaller and the cleaner the aiframe, the better!

This motor is the best motor to get i think, it is good for starters on 3S and 4S, good for bigger planes on 4S also and absolutely crazy on 5S for those who know their stuff.

Joe
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Old Nov 02, 2008, 04:01 AM
Tragic case
davidleitch's Avatar
Sydney Australia
Joined Feb 2002
5,875 Posts
cadeuces4

Congratulations on your successful flight. I trust you will be entering some F5B competitions, that Nats, next Easter at Cootamundra if not before.

regards
David Leitch
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Old Nov 02, 2008, 08:51 AM
BEOWULF
North vancouver, B.C. Canada
Joined Apr 2008
18,576 Posts
cadeuces4

been looking for m3 m4 nylon bolts
very hard to find
special orders only by the package

with 5 cells are you really going to use nylon bolts?
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Old Nov 02, 2008, 10:52 AM
One Idiot is plenty...
Dbox's Avatar
Planet Earth
Joined Jun 2005
5,186 Posts
Quote:
Originally Posted by jjmouris
I've flown a 1509/1.5D/6.7 and old CC 125 with 5S TP V2 3850mah with all the RFM props ranging from 14.5x14 to 18x19 without problems.

It will work but at the top end the motor does get hot and it is recommended by me that you only do a short flight of 30-40 seconds motor time maximum and then let it cool down completely before flying it again (30min with no added cooling fan).

Also my 5S pack might have been going south (voltage drop) when i flew it on the 18x19 (is really only 17'' dia on a 36mm 7degree hub) so on your fresh 5S 5Ah packs you might end up getting in trouble regarding motor temps.

Anyway, you will have a lot more fun with this motor on 5S and the RFM 16x17 for sure! The smaller and the cleaner the aiframe, the better!

This motor is the best motor to get i think, it is good for starters on 3S and 4S, good for bigger planes on 4S also and absolutely crazy on 5S for those who know their stuff.

Joe
Great post ,Joe.
Thank You for sharing.I kind of skipped this motor ,but want to try it some day now.
Yuri.
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