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Goldwing RC Corvus 60cc ARTF for electric set up

About as big as I want to go

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Adrian Smith 115/11/2017 16:01:08
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Fuz looks pretty good too.

fullsizeoutput_a57.jpeg

Rich too15/11/2017 19:03:17
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Nice, early Xmas!

I converted a couple of Extras around 60” span, one was a Glens Models. Both dropped a wing during a turn and went in big time! Probably, nothing to do with being electric but I have avoided a similar situation with petrol for 4 - 5 years!

Denis Watkins15/11/2017 19:10:52
2717 forum posts
137 photos

Both you, Rich, and Adrian have touched on this "sudden power drop off surprise with leccy" a number of times.

It is my privilege that all the boys at my club count on me to test fly everything, be it glow, petrol or leccy

And I too have noticed this "power drop at or before idle" mystery on smaller electric as opposed to bigger motors.

Can this be pinned down with science?

Your comments appreciated

john stones 115/11/2017 21:30:48
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I dumped a Dawn Flyer n something else into the floor on lecky, turns at low speed, something I'd get away with on i.c because props still giving me something at tickover, pilot was flying on instinct n forgetting power source was set up different, not lecky to blame, pilots fault.

Gary Manuel15/11/2017 21:38:57
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Lovely looking model Adrian.

I'm sure it will do really well with your electric setup, but have you got any reservations about not sticking a 60cc petrol in it?

Adrian Smith 115/11/2017 23:13:00
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1898 forum posts
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Gary, the answer to your question, surprisingly, is no. I just find to to set up electrics is simplicity itself. Now that the technology is in place to be able to fly 60cc airframes using electric powertrains it is an attractive route to follow. I love large scale stuff.

John & Denis. I may have been lucky, but I have never had the "sudden power drop off with my electrics" . That is probably because I fly the down leg & finals at a fair clip of speed before reducing the throttle just before touchdown. I just found that it's horses for courses and I fly petrols in a completely different way to electrics.

iqon16/11/2017 01:11:35
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Posted by john stones 1 on 15/11/2017 21:30:48:

I dumped a Dawn Flyer n something else into the floor on lecky, turns at low speed, something I'd get away with on i.c because props still giving me something at tickover, pilot was flying on instinct n forgetting power source was set up different, not lecky to blame, pilots fault.

I agree ( for once ) been there done that.....

Tom Thomas16/11/2017 02:58:38
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207 photos
Posted by Adrian Smith 1 on 14/11/2017 14:48:57:

For a while now I have wanted to compare like for like 60cc petrol aircraft with a comparable electric set up. Well I have now taken the plunge with this aircraft from RapidRC Models.

**LINK**

Pretty much fits the bill. I have not decided on the servos, but something in the region of 25kg at 6 volts is what I am after. Clearly, I am on a budget and I don't want to go silly.

On a budget? .......... on a "budget"!........ it ain't my budget mate! cheeky

Rich too16/11/2017 13:43:23
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Posted by Denis Watkins on 15/11/2017 19:10:52:

Both you, Rich, and Adrian have touched on this "sudden power drop off surprise with leccy" a number of times.

It is my privilege that all the boys at my club count on me to test fly everything, be it glow, petrol or leccy

And I too have noticed this "power drop at or before idle" mystery on smaller electric as opposed to bigger motors.

Can this be pinned down with science?

Your comments appreciated

Good point, I never thought of that. I'm not going back any time soon though! I love the smell of petrol wink

Adrian, it is very poor that OS have not yet seen you right on this - shocking service.

 

Edited By Rich too on 16/11/2017 13:43:39

Edited By Rich too on 16/11/2017 13:44:02

Adrian Smith 118/11/2017 16:16:10
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I had a very productive afternoon before a week of family commitments keep me away from my workshop.

First job is to solder the connectors on to the motor and corresponding leads on the ESC. I used a little jig made out of oak and drilled dome varying size holes in it, along with a helping hand tool.

fullsizeoutput_a5b.jpegFirst three all done on the motor and then on to the ESC.

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Adrian Smith 118/11/2017 16:18:17
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1898 forum posts
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fullsizeoutput_a60.jpegNext I soldered one side of the anti spark plugged which came with the DualSky ESC.

fullsizeoutput_a5e.jpegAnd then to finish.

fullsizeoutput_a5f.jpeg

Adrian Smith 118/11/2017 16:23:36
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1898 forum posts
617 photos

On to the firewall and motor standoffs. I had to draw template,but fortunately the lug mounting hols where all equidistant at 70mm. The side thrust is built in and the grooved line inscribed on the firewall reflects this. Therefore is was a simple job to tape the template to the firewall and drill.

fullsizeoutput_a61.jpeg

fullsizeoutput_a62.jpegMotor mounted and all pretty straightforward although I had to change the suppled M5 bolts from 25mm to 30mm to accommodate the additional length of the standoff spacers.

Adrian Smith 118/11/2017 16:31:18
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1898 forum posts
617 photos

Finally, the litmus paper test - does the cowl fit and line up properly with the motor?

fullsizeoutput_a63.jpeg

Looks good to me and very happy with it. Before I can do much more I need to finally decide what servos to use. For general pattern flying the range is for 11-16kg digital MGs according to the GoldWing manual, but I am not convinced 16kg is enough. That said I am not going to do 3D flying to any degree. Also I am also now thinking about some 6S 5000mAh lipos for my 12S set up so that decision will have to be made soon. Additionally, a mid to upper range wooden prop is suggested by DualSky at 24x10, but for pattern flying I would probably go for a 24x8 or something close to that.

Gary Manuel18/11/2017 16:32:15
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1572 forum posts
1465 photos

That motor looks a right beast! Should make for a tidy cowl installation. {Edit - it does.}

Let us know whether the anti-spark works. I've got a 12 cell model to build soon and I've been concerned about the spark. It's bad enough with 6 cells, let alone 2 in series.

Edited By Gary Manuel on 18/11/2017 16:34:03

Percy Verance18/11/2017 16:33:28
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6479 forum posts
110 photos

I think I'd have preferred a good strong ply box for that motor rather than stand-offs. There is going to be a hell of a lot of torque there.......

Adrian Smith 118/11/2017 16:38:39
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1898 forum posts
617 photos

The standoffs are what DualSky provide with the motor so no doubts there, Percy. Also the fire box is already reinforced ready for I/C use.

Gary, I have used that type of anti spark connector before and I can thoroughly recommend them. I think Electric Wingman do them.

 

Edited By Adrian Smith 1 on 18/11/2017 16:38:50

Rich too18/11/2017 16:53:11
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2613 forum posts
1011 photos

Nice Adrian. That motor certainly is a beast!

Gary Manuel18/11/2017 16:54:20
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1572 forum posts
1465 photos

Thanks Adrian. I'll get one ordered.

Adrian Smith 118/11/2017 17:17:57
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1898 forum posts
617 photos

Gary, the AS150 spark connectors came from buildyourowndrone website, about £7. Sorry had a memory malfunction! Good service from them as I have used them before yes

Gary Manuel18/11/2017 17:26:48
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1572 forum posts
1465 photos

They are 7mm ones Adrian. I'm pretty sure my bullet connectors are all 5.5mm but I need to check. Pity because the price is good.

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