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Old Feb 14, 2012, 01:37 PM
Astrowall is offline
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Andrew
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Originally Posted by Banjofrog View Post
Yes I was surprised as well, she flies strong with this prop. The flight I recorded I had to do a go around, I did some barrel rolls, a couple of loops, some vertical as well and mix of 1/2 to full throttle flying so I am happy with that prop and starting to wonder about 4 bladed but I have to find one that is worth a try. My equipment is a "watts up" meter and Turnigy Accucell 6 charger.

Shaun.

What motor Esc setup you running to get those numbers... looks a good set of numbers.
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Old Feb 14, 2012, 06:23 PM
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Geez That's A Big Fly
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Originally Posted by Astrowall View Post
What motor Esc setup you running to get those numbers... looks a good set of numbers.
Astro, here is the set up,

https://www.rcgroups.com/forums/member.php?u=376299

Shaun.
Old Feb 14, 2012, 06:53 PM
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Here is the results from this mornings static test:

Turnigy G46 670kv
Turnigy Plush 80 amp ESC
Master Air Screw 12x8 3 Blade
Turnigy 3300mah 4s 30-40c

Name: Boomerang Static Test.jpg
Views: 67
Size: 238.6 KB
Description: With MAS 12x8 3 blade 15/02/2012Name: Boomerang Static Test 2.jpg
Views: 52
Size: 247.2 KB
Description: With MAS 12x8 3 blade 15/02/2012Name: Boomerang Static Test 3.jpg
Views: 61
Size: 168.9 KB
Description: With MAS 12x8 3 blade 15/02/2012

Shaun.
Old Feb 14, 2012, 11:58 PM
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ok finally got a short vid os ep boomerang 40 , camaera guy was not he best so, sorry in advance
boomerang 40.wmv (0 min 43 sec)



plenty of power she flies nice on 1/3 power
Old Jun 05, 2012, 01:02 AM
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I have been reading through this thread and I would like to ask a question about battery size. I am new to fixed wing but have been flying helis for a few years. I have lots of foam RTF toy planes but the Boomerang will be my first foray into a real model. I want to get my bronze wings.

Like you guys I am converting the Boomerang and will be using an EFlite Power 46, 670kv, 925w motor. I have a spare 100a Align ESC I will be using. My present plan is to use a 12 x7 or 8 prop. I have some 6S 3000mAh batteries for my 500 Helis and rather than go out and start buying more batteries (4S seems to be the favourite) I would like to use these. I would presume to keep the top end prop speed down all I need to do is bring my Tx throttle curve down to say 80%. ( Not sure what it would be so I have just plucked a figure out of the air).

Does this make sense or should I bite the bullet and buy some more batteries.
Last edited by Watdazit; Jun 05, 2012 at 04:39 PM.
Old Jun 05, 2012, 01:54 AM
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Originally Posted by Watdazit View Post
I have been reading through this thread and I would like to ask a question about battery size. I am new to fixed wing but have been flying helis for a few years. I have lots of foam RTF toy planes but the Boomerang will be my first foray into a real model. I want to get my bronze wings.

Like you guys I am converting the Boomerang and will be using an EFlite Power 46, 670kv, 925w motor. I have a spare 100w Align ESC I will be using. My present plan is to use a 12 x7 or 8 prop. I have some 6S 3000mAh batteries for my 500 Helis and rather than go out and start buying more batteries (4S seems to be the favourite) I would like to use these. I would presume to keep the top end prop speed down all I need to do is bring my Tx throttle curve down to say 80%. ( Not sure what it would be so I have just plucked a figure out of the air).

Does this make sense or should I bite the bullet and buy some more batteries.
6S 3000 IMO is a great battery for this size model, better than 4S, but unfortunately the G46-670 Kv is IMO a bit too high to use decent size props - and bringing the top end of the throttle down is definitely NOT a solution. The good news is that there are plenty of motor choices that will work well with 12" props, and replacing one motor (if you've already bought it) is cheaper than buying new 4s 4000+ packs. What keeps a lot of folks away from 6S is the pack cost and charging, but you've already got that solved, so I'd definitely stick with 6S.

The G46-550 should use about 700W on a 12x6. The G60-500 should use about 700W on a 12x8. The G46-420 should use about 530W on a 12x10. The G60-400 should use about 480W on a 12x10; more like 590W with 13x10. All will have decent pitch speed. If you need a bit more weight up front consider the G60-500, otherwise IMO the G46-550 is a great 6S 12" prop combination at a very healthy power level for the Boomerang. If you think a 13" prop or bigger might be in the mix, then probably the G46-420 or G60-400. Have a play in ECalc - dead easy.

I currently fly my LT-25 Kadet on 6S 2200 or 3000, 12x10 and a Hacker A40-12L, Kv=410 at about 500W and love it. On the 2200s I set the timer for 8 minutes, and just throw it around the whole time.

Again, limiting throttle is NOT a solution for an overpropped motor, and the 670 is very close to its limit at 12x6 - you'd be happier in the long run with a better match
Old Jun 05, 2012, 02:12 AM
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Originally Posted by scirocco View Post
6S 3000 IMO is a great battery for this size model, better than 4S, but unfortunately the G46-670 Kv is IMO a bit too high to use decent size props - and bringing the top end of the throttle down is definitely NOT a solution. The good news is that there are plenty of motor choices that will work well with 12" props, and replacing one motor (if you've already bought it) is cheaper than buying new 4s 4000+ packs. What keeps a lot of folks away from 6S is the pack cost and charging, but you've already got that solved, so I'd definitely stick with 6S.

The G46-550 should use about 700W on a 12x6. The G60-500 should use about 700W on a 12x8. The G46-420 should use about 530W on a 12x10. The G60-400 should use about 480W on a 12x10; more like 590W with 13x10. All will have decent pitch speed. If you need a bit more weight up front consider the G60-500, otherwise IMO the G46-550 is a great 6S 12" prop combination at a very healthy power level for the Boomerang. If you think a 13" prop or bigger might be in the mix, then probably the G46-420 or G60-400. Have a play in ECalc - dead easy.

I currently fly my LT-25 Kadet on 6S 2200 or 3000, 12x10 and a Hacker A40-12L, Kv=410 at about 500W and love it. On the 2200s I set the timer for 8 minutes, and just throw it around the whole time.

Again, limiting throttle is NOT a solution for an overpropped motor, and the 670 is very close to its limit at 12x6 - you'd be happier in the long run with a better match
Only problem being is that none of the G46's are rated at 6s, they have a 5s limit, I use 6s on my turnigy 5055-400 and the 12x8x3 prop, amp draw is 45amps static and pulls over 900watts, all this in a scanner low wing trainer, people have described it as being overpowered lol.

The other problem is as I discovered, is that he G46's rely on you using a collet adaptor, I had the prop and collet fly off on a few occasions until I was able to really get it tight, at this size I prefer to have the bolt on prop adaptor which works really well.
Old Jun 05, 2012, 04:02 AM
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Originally Posted by aeromaniac View Post
Only problem being is that none of the G46's are rated at 6s, they have a 5s limit, I use 6s on my turnigy 5055-400 and the 12x8x3 prop, amp draw is 45amps static and pulls over 900watts, all this in a scanner low wing trainer, people have described it as being overpowered lol.

The other problem is as I discovered, is that he G46's rely on you using a collet adaptor, I had the prop and collet fly off on a few occasions until I was able to really get it tight, at this size I prefer to have the bolt on prop adaptor which works really well.
Fair enough re the 5S recommendation on the G46, but using a smaller prop and keeping the current and power well below limits, higher voltage is usually not an issue unless rpm is excessive, and rpm for a G46-550 on 6S is about the same as a G46-670 on 6S. It's usually amps that cook motors, not volts.
Old Jun 05, 2012, 05:56 AM
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Originally Posted by scirocco View Post
Fair enough re the 5S recommendation on the G46, but using a smaller prop and keeping the current and power well below limits, higher voltage is usually not an issue unless rpm is excessive, and rpm for a G46-550 on 6S is about the same as a G46-670 on 6S. It's usually amps that cook motors, not volts.
I totally agree with you, not everyone understands the relationship of volts vs amps.
Old Jun 05, 2012, 06:06 AM
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Originally Posted by aeromaniac View Post
I totally agree with you, not everyone understands the relationship of volts vs amps.
I've ordered the Turnigy G46 670kv for my scratch built trainer and was wondering if this lipo would be ok ? http://www.hobbyking.com/hobbyking/s...po%5FPack.html
Old Jun 05, 2012, 06:22 AM
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Thanks guys. I just looked at the Hacker A40-12L V2 and its rated at 610kv and 900 watt which is not much different to the EFlite motor and different to the 410 and 500W rating quoted by scirroco. Perhaps the V2 has been changed.

I am new to sizing motors for planes so this is all a learning exercise. You talk about motors with a prefix of "G". Can you explain please.
Old Jun 05, 2012, 06:36 AM
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Originally Posted by Watdazit View Post
Thanks guys. I just looked at the Hacker A40-12L V2 and its rated at 610kv and 900 watt which is not much different to the EFlite motor and different to the 410 and 500W rating quoted by scirroco. Perhaps the V2 has been changed.

I am new to sizing motors for planes so this is all a learning exercise. You talk about motors with a prefix of "G". Can you explain please.
Watdazit,

This is my A40-12L V2

The G prefix is the Turnigy Easymatch series, G46, G60 etc. Sorry, I mistook your reference to a Power 46 to the HobbyKing Turnigy G46 - same specs, different prices, many say about the same performance. I'm happy with my G32. I kind of assumed with the bronze wings ref you're an Aussie and would be familiar with HK.

I use them as examples because they have a good range of available Kv across a couple of sizes (~300g, ~350g), whereas Eflite for example only seems to have the one Kv available in most sizes. The bottom line is matching Kv and cell count to prop size, and the examples I posted are relevant to any motor of similar size & weight to get you in the ballpark.
Old Jun 05, 2012, 06:43 AM
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Originally Posted by RC Trainer plane View Post
I've ordered the Turnigy G46 670kv for my scratch built trainer and was wondering if this lipo would be ok ? http://www.hobbyking.com/hobbyking/s...po%5FPack.html
Very hard to know without any info about weight or wing area, but as long as it's under about 8lb and has at least 600in^2, it should be fine with up to 12x6 or 12x8. Any bigger on 5S and you're over the motor limit. 11" prop should be OK under about 7lb.
Old Jun 05, 2012, 07:24 AM
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Very hard to know without any info about weight or wing area, but as long as it's under about 8lb and has at least 600in^2, it should be fine with up to 12x6 or 12x8. Any bigger on 5S and you're over the motor limit. 11" prop should be OK under about 7lb.
Thanks mate
Old Jun 05, 2012, 07:30 AM
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Thanks scirocco. Yes I am Aussie and actually live in Braidwood. I am also aware of HK but in flying helis the only thing I have bought from them to use on helis are batteries and I have had bad experiences in that is 25% of them have been duds. I have bought some foam planes and these generally I rate poor to average in quality but value for money. They are a great introduction to learning to fly cheaply. I have a lot to learn about the motor/prop/ battery combinations on planes. Helis are much easier in this regard. I might initially try one 4S and charge it at the field. Will I be ok with a 12 x 7 or 8 prop?
PS Link for Hacker didn't work. I looked at the Esprit Models site.
Last edited by Watdazit; Jun 05, 2012 at 07:36 AM.


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