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Old Jan 22, 2012, 02:42 AM
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Hi Guy's,

I am a bit late starting this project (Wife had me do up the study into a home office over the xmas break) but I have now made a start here are some photo's to start with. The prop is 12x10E (Scirocco recommended) the only way to get a larger prop on without risk of striking the ground is to put larger wheels on, which is not a bad thing. Only have wiring up to do and sort out the CG.

Shaun.
Last edited by Banjofrog; Jan 22, 2012 at 10:24 PM.
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Old Jan 22, 2012, 03:31 AM
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Originally Posted by Banjofrog View Post
Hi Guy's,

I am a bit late starting this project (Wife had me do up the study into a home office over the xmas break) but I have now made a start here are some photo's to start with. The prop is 12x10E (Sirocco recommended) the only way to get a larger prop on without risk of striking the ground is to put larger wheels on, which is not a bad thing. Only have wiring up to do and sort out the CG.

Shaun.
Looks like you got the motor right where you need it, and no extra holes in the firewall

I'd be surprised if you ever bother with bigger wheels: 600+ watts in at good efficiency and a 12x10 prop should see your Boomerang really get up and go.

Good luck with the maiden!
Old Jan 22, 2012, 04:12 AM
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Originally Posted by scirocco View Post
Looks like you got the motor right where you need it, and no extra holes in the firewall

I'd be surprised if you ever bother with bigger wheels: 600+ watts in at good efficiency and a 12x10 prop should see your Boomerang really get up and go.

Good luck with the maiden!
I would like to thank you Scirocco your help has been great and all the others I didn't go with the original standoff but you put ideas in my head. I shall post static power readings and of course the maiden report.


Shaun.
Last edited by Banjofrog; Jan 22, 2012 at 07:45 AM.
Old Feb 04, 2012, 04:30 AM
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Maiden


Here is a small video of the maiden, all went fantastic. Thankyou everyone that gave their advice and this video is for you guy's enjoy.

Boomerang Maiden (1 min 8 sec)


She flies better than I expected. oh I used the 3300mah battery, flew for 6 mins and only used 1260mah and it was very windy 15km/hr plus winds so 12 mins is not out of the question and that leaves some in reserve.

Shaun.

I used MAS 12x6 3 blade as the 12x10 2 blade was way out of balance and I junked it after trying to balance it.
Old Feb 04, 2012, 08:07 AM
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Originally Posted by Banjofrog View Post
Here is a small video of the maiden, all went fantastic. Thankyou everyone that gave their advice and this video is for you guy's enjoy.

http://www.youtube.com/watch?v=n07lC...75AUAAAAAAAAAA

She flies better than I expected. oh I used the 3300mah battery, flew for 6 mins and only used 1260mah and it was very windy 15km/hr plus winds so 12 mins is not out of the question and that leaves some in reserve.

Shaun.

I used MAS 12x6 3 blade as the 12x10 2 blade was way out of balance and I junked it after trying to balance it.
Nice one banjo, while I don't have a boomerang, I did get the G46 after seeing golf's boomerang and put it in my thunder tiger obl 40 on 4s 3700mah batteries.

I did some prop tests and found that a 12x8 apce thin pulled 36-37 amps wot, a emp 12x8 pulled nearly 54amps.
Old Feb 04, 2012, 09:41 AM
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Thanks Aero, I have put more detail on my blog, with the MAS 12x6 3 blade I am pulling 37 amp and just under 600 watts @wot I have got some APCe props here just cant remember the size.

Shaun.
Old Feb 05, 2012, 03:19 AM
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Love the vid Banjo, you've got some great skills there. The boomer flies well too.
Old Feb 05, 2012, 05:47 AM
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Great to see! No lack of grunt on the takeoff by the look of it

Now you've got an idea what you're getting into and that there's heaps of power, when you get around to it I'd still recommend trying the APC 12x10E. Should draw about the same current, and give at least the same static thrust, but cruise thrust should be quite a bit better at reduced power.

Surprised to hear the 12x10 was badly out of balance. I've never had an APC E prop need more than about 20mm x 20mm magic tape on the back of a blade, usually a lot less. APC does recommend a specific balancing technique - here it is.

Again - congrats on a good maiden.

Scirocco
Old Feb 05, 2012, 05:49 AM
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Love the vid Banjo, you've got some great skills there. The boomer flies well too.
Thanks Jeff,

Your too kind. I took the Boomerang out again today, she really does fly well. I got 12min flight from a 3300mah 4s and she came down with 29% left in the battery so you can't complain at that. If I was to use the 5800mah batteries I may be able to get 18 - 20mins , imagine concentrating for that long for a prop job it's much easier with gliders cause they fly slower. Ummm the battery just finished charging it used 2251mah omg that's 18min to a dead flat battery. So on a 3300mah you could fly for 14 mins with time for a go around. I don't think I will use the 5800 mah batteries I don't need a stiff neck . Oh I place the battery where the fuel tank use to go and the esc is behind the firewall. With the setup I have nothing gets hot or over stressed. Are you still doing yours or have you done it, if so how did it go?

Shaun.
Old Feb 05, 2012, 05:53 AM
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Great to see! No lack of grunt on the takeoff by the look of it

Now you've got an idea what you're getting into and that there's heaps of power, when you get around to it I'd still recommend trying the APC 12x10E. Should draw about the same current, and give at least the same static thrust, but cruise thrust should be quite a bit better at reduced power.

Surprised to hear the 12x10 was badly out of balance. I've never had an APC E prop need more than about 20mm x 20mm magic tape on the back of a blade, usually a lot less. APC does recommend a specific balancing technique - here it is.

Again - congrats on a good maiden.

Scirocco
Thanks mate, you have helped me tremendously with this project. Yep the APCe 12x10 is on my hit list and I will try some others just for kicks.

Shaun.

PS. It was a TG sport prop from Hobby King the one that was badly unbalanced
Old Feb 05, 2012, 06:03 AM
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Mate, you're most welcome. With those flight times looks like everything is working out really well.

BTW, thanks for posting your flight time and recharge amount. 12 minutes, 2250 mAH, 4S, say 15V average, works out to average power in flight of only 168W. Surprising how little it takes to fly.
Old Feb 05, 2012, 06:13 AM
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I will also post what power usage and flight times for different props with the same 3300mah 4s battery as I go. Cause the more info we have the better.

Shaun.
Old Feb 14, 2012, 06:24 AM
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I have been experimenting with different props so far with same battery 3300mah 4s(full charge after each test):

1) MAS 12x6x3 already stated above
2) TGS 12x10x2 41.8 amp, 670 watts static @wot. Flight good 6mins used 2089mah.
3) APC 12x8x2 35.43 amp, 571.1 watts @wot no flight yet
4) APC 12x10x2 43.5 amp, 686.8 @ wot no flight yet
5) MAS 12x8x3 50.64 amp, 792 watts @ wot flight time 7 mins recharge 1777mah used.

The 3 bladed props are working out a bit better than I expected, they seem to be more efficient than the 2 bladed ones which is a bit of a surprise.

I reckon if I used a 5s she would do unlimited vertical, does pretty good vertical on 4s with MAS 12x8x3 prop.

Shaun.
Last edited by Banjofrog; Feb 14, 2012 at 08:00 AM.
Old Feb 14, 2012, 06:56 AM
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Originally Posted by Banjofrog View Post
I have been experimenting with different props so far with same battery 3300mah 4s(full charge after each test):

1) MAS 12x6x3 already stayed above
2) TGS 12x10x2 41.8 amp, 670 watts static @wot. Flight good 6mins used 2089mah.
3) APC 12x8x2 35.43 amp, 571.1 watts @wot no flight yet
4) APC 12x10x2 43.5 amp, 686.8 @ wot no flight yet
5) MAS 12x8x3 50.64 amp, 792 watts @ wot flight time 7 mins recharge 1777mah used.

The 3 bladed props are working out a bit better than I expected, they seem to be more efficient than the 2 bladed ones which is a bit of a surprise.

I reckon if I used a 5s she would do unlimited vertical, does pretty good vertical on 4s with MAS 12x8x3 prop.

Shaun.
That's a pretty impressive result with the 12x8x3 at only 1777mAh for 7 mins on a nearly 800W system. I might try that on my LT-25 - should be interesting at only 2kg ready to fly
Old Feb 14, 2012, 07:59 AM
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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.


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