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Old Nov 11, 2012, 04:50 PM
Geez That's A Big Fly
Banjofrog's Avatar
Australia, WA, Parkerville
Joined Sep 2011
1,333 Posts
Quote:
Originally Posted by Watdazit View Post
Good question. Yes I have had a problem and broken one prop with a heavy landing. I have not changed the wheels although I have thought about changing the front one only. However at this stage I have left the rear wheels spread a little (from my heavy landings,) which has the effect of lifting the nose. I also put a lot of effort into making perfect landings!

An alternative is to go to a 300mm 3 blade prop. I have looked at posts on sizing these and need to get my grey brain around the maths to work out an equivalent size.
I have used 12x6x3 and 12x8x3 MAS props and both worked well, my maiden was with the 12x6x3 and 12-14min flight times on a 3300mah, currently I am using a 12x10x2 apc electric, imho you will get prop strike with anything bigger.

Shaun.
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Old Nov 11, 2012, 09:21 PM
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scirocco's Avatar
Australia, ACT, Kambah
Joined Feb 2001
2,832 Posts
viagra day

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Originally Posted by Watdazit View Post
Thanks, it was good enough to do my Bronze wings yesterday. My instructor had me do a 2 loops at the end, (celebration??) and the Boomer handled it well. I have done loops, flips and rolls with 800mm wing span HK crash dummy planes so I can do them but doing it with a balsa/ply 1500 ":real" plane was a little bit nerve racking.

Are you going to the Viagra Glider day at Namadgi on Friday? I will be taking my Bixler and Radian Pro. I like gliding but am not very good at it.
Only heard about it at the club yesterday but it's real tempting to take the day off. Might bring an easy glider and a 2m floater
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Old Nov 12, 2012, 01:29 AM
Registered User
Australia, VIC, Golden Square
Joined Jul 2009
18 Posts
Quote:
Originally Posted by Watdazit View Post
Thanks, it was good enough to do my Bronze wings yesterday. My instructor had me do a 2 loops at the end, (celebration??) and the Boomer handled it well. I have done loops, flips and rolls with 800mm wing span HK crash dummy planes so I can do them but doing it with a balsa/ply 1500 ":real" plane was a little bit nerve racking.

Are you going to the Viagra Glider day at Namadgi on Friday? I will be taking my Bixler and Radian Pro. I like gliding but am not very good at it.
Had a giggle at "Viagra" glider day.
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Old Nov 12, 2012, 03:27 AM
A geriatric flier
Australia, NSW, Braidwood
Joined Nov 2008
674 Posts
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Originally Posted by wobblygts View Post
Had a giggle at "Viagra" glider day.
It's all to do with keeping it up.......
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Old Nov 13, 2012, 12:22 AM
Registered User
Australia, VIC, Ferntree Gully
Joined Nov 2010
165 Posts
tried the 13 x 8 prop today. full tilt was 52a and 770 watts.

have bought a tacho, so when that arrives I will document the rpm, draw, watts according to the wattmeter, then maybe some real math can be done.
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Last edited by peterreebok; Nov 13, 2012 at 12:28 AM.
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Old Nov 13, 2012, 12:35 AM
Glow 😡 no no no
Australia, SA, Evanston Park
Joined Mar 2010
4,360 Posts
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Originally Posted by peterreebok View Post
tried the 13 x 8 prop today. full tilt was 52a and 770 watts.

have bought a tacho, so when that arrives I will document the rpm, draw, watts according to the wattmeter, then maybe some real math can be done.
Watts sound ok lol
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Old Nov 14, 2012, 04:48 PM
Glow 😡 no no no
Australia, SA, Evanston Park
Joined Mar 2010
4,360 Posts
Just tried the G46 on my emeter with a tgs 12x8 2bl, was surprised with the data, fresh rhino 3700mah 25c 4s battery, wot 15.28v, 54.7a, 837w, 9060rpm.
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Old Nov 14, 2012, 06:44 PM
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scirocco's Avatar
Australia, ACT, Kambah
Joined Feb 2001
2,832 Posts
That current and power seems way way higher than it should be, especially for the rpm, which is not that high. Beiung higher than peter saw for a 13x8 is definitely odd. I'd have expected under 40A, even the peak value hot off charge.

I wonder whether the TGS props just eat a lot of amps? I also wonder whether the Kv on your motor is higher than spec.
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Old Nov 14, 2012, 11:45 PM
Glow 😡 no no no
Australia, SA, Evanston Park
Joined Mar 2010
4,360 Posts
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Originally Posted by scirocco View Post
That current and power seems way way higher than it should be, especially for the rpm, which is not that high. Beiung higher than peter saw for a 13x8 is definitely odd. I'd have expected under 40A, even the peak value hot off charge.

I wonder whether the TGS props just eat a lot of amps? I also wonder whether the Kv on your motor is higher than spec.
Not sure mate but the performance is certainly there to back up the amps, doing a low and slow, push wot and pull vertical until she gets kinda small. I know the auw for the plane is around 2.4kg. So I have no idea why my specs are higher?.

I am as surprised as you with the performance, way more than I expected from a 12x8.
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Old Nov 15, 2012, 12:14 AM
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scirocco's Avatar
Australia, ACT, Kambah
Joined Feb 2001
2,832 Posts
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Originally Posted by aeromaniac View Post
Not sure mate but the performance is certainly there to back up the amps, doing a low and slow, push wot and pull vertical until she gets kinda small. I know the auw for the plane is around 2.4kg. So I have no idea why my specs are higher?.

I am as surprised as you with the performance, way more than I expected from a 12x8.
Well if it's not cooking anything all I can say is bonus

I kinda like the gentle slow pass and pull vertical thing in a trainer too - makes the average glow Boomerang or Swift look a bit anaemic, except they do get better duration
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Old Nov 15, 2012, 03:36 AM
Glow 😡 no no no
Australia, SA, Evanston Park
Joined Mar 2010
4,360 Posts
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Originally Posted by scirocco View Post
Well if it's not cooking anything all I can say is bonus

I kinda like the gentle slow pass and pull vertical thing in a trainer too - makes the average glow Boomerang or Swift look a bit anaemic, except they do get better duration
Well I wack 5000mah behind that motor duration should be ok.
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Old Feb 19, 2013, 03:24 AM
A geriatric flier
Australia, NSW, Braidwood
Joined Nov 2008
674 Posts
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Originally Posted by Watdazit View Post
After a lot of messing around I have eventually settled on a electric system for my Boomerang.

Motor is an Eflite Power 46
Batteries 4S at present I am using Zippy Compacts 25/35C 4000 mAh
Prop is an APC 13 x 8 E
On the watt meter it is returning 38 amps and 571 watts.
I am flying 7 mins at present and showing 45% to 50% left in the battery.

I am a novice so I am not pushing it but as I get more confident undoubtably my flying time will stay the same but I will be using more mAh.

The motor is working way under its potential of 800watts. The closest I have got to using this power is with a 5S setup and 13 x 6.5 prop or a 12 x 8 prop. The flying times were greatly reduced so that's why I decided to go 4S.

I still have not got a handle on all this motor vs prop vs battery thing but I'm flying comfortably at present and have a system I think can grow with me.
After suffering a few prop strikes I decided to change to 4500 5S 25C Zippy Compacts and 12 x 6 APC E prop. Sounds better and goes OK. It will pull vertical at the end of the runway and roll a couple of times. Starts to run out of puff after about 8 secs going vertical but I am happy. After all it is only a trainer.
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Old Feb 19, 2013, 06:37 AM
Dave
Australia, QLD, Brisbane
Joined Apr 2012
134 Posts
I've bought the boomerang II with electric conversion and the choice between tail dragger and trike. Bought the g46 plush 70a and 4000 4s lipo. No room to start building so gathering dust in the box for bit longer...
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Old Apr 05, 2013, 09:15 PM
Registered User
Australia, VIC, Ferntree Gully
Joined Nov 2010
165 Posts
Maidened my boomer today.
G46 670 kv running 12 x 8 prop.
Able to pull verticals with three quarter throttle.
3 clicks of trim needed only, 12 minutes of flight on a 4500 4s battery with 40% remaining.
Tracks straight and true, not a single issue, very happy with conversion.
very quiet, sort of like a stealth trainer remarked one observer.
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Old Apr 08, 2013, 10:35 PM
Dave
Australia, QLD, Brisbane
Joined Apr 2012
134 Posts
Quote:
Originally Posted by peterreebok View Post
Maidened my boomer today.
G46 670 kv running 12 x 8 prop.
Able to pull verticals with three quarter throttle.
3 clicks of trim needed only, 12 minutes of flight on a 4500 4s battery with 40% remaining.
Tracks straight and true, not a single issue, very happy with conversion.
very quiet, sort of like a stealth trainer remarked one observer.
How does it handle wind ?
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