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Author Topic: Two motor indoor electric stunt plane  (Read 3185 times)

Offline Matt Piatkowski

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Two motor indoor electric stunt plane
« on: January 18, 2017, 08:49:10 PM »
Hello,
I will build the two motor indoor electric stunt plane using the build-up Depron wing with 23% airfoil.
EMAX2822 motors will be used.

Please provide the sketch of possible electrical connections between motors, one larger or two smaller batteries, KR governors and ESCs.
I would like to have one Master Switch.

Which is better and why:one large or two smaller batteries in series.

Thanks,
Matt

Offline pmackenzie

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Re: Two motor indoor electric stunt plane
« Reply #1 on: January 19, 2017, 04:55:06 AM »
Hi Matt.

If you want to run two smaller batteries then they would be put in parallel, not in series.

Because you are using the KR timers you will need two of them. The only way to get them to operate from one switch would be to use a double pole switch.

If you were suing a timer that did not have the RPM feedback then you could use one timer to control both ESCs.

I can do you a sketch on Saturday.

Pat MacKenzie
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Offline Matt Piatkowski

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Re: Two motor indoor electric stunt plane
« Reply #2 on: January 19, 2017, 05:31:09 AM »
Hi Pat,
I got the diagram from Keith Renecle.
I will also use his timers and the ESCs tested with these timers.

Regards,
M

Offline John Rist

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Re: Two motor indoor electric stunt plane
« Reply #3 on: January 19, 2017, 10:08:22 AM »
Two KR timers on a twin could be fun.  You could adjust line tension by adjusting the RPM of the inboard motor up a little.  Also I would suggest a double pole arming switch.  That way both motors will start and stop at the same time.  Also a single battery may be a good ideal.  That way both motors will quit, if for some reason, you run out of battery juice.   Most of us that fly electric have had battery problems at some time.  Pilot error such as loading an uncharged battery ain't smart but can  and does happen.

Good luck.  Pictures please as you get it going.   #^
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Offline John Tate

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Re: Two motor indoor electric stunt plane
« Reply #4 on: January 19, 2017, 03:13:57 PM »
EMAX 2822 motor seems a little large for me. And you want to run two of them!!! I tried indoor with an EMAX 2805 motor. I had good power flying on 25 foot lines.

Offline Matt Piatkowski

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Re: Two motor indoor electric stunt plane
« Reply #5 on: January 19, 2017, 04:05:07 PM »
John,
What is "a double pole arming switch"?
For single motor applications ( please see the attached; EMAX2822 was used in both planes) I use the slide switch provided by Keith Renecle with his governors and it has two positions: off and on.
In Keith's diagram of electrical connections for the two motor indoor stunt plane, he used the same switch that allows both motors to be started at the same time.
I have decided to use EMAX2812 motors instead of EMAX2822 in this plane.

The photos and the building log will start appear on this forum in August 2017.

Considering the comment of John Tate: I am not trying to create the lightest possible indoor stunt plane. My both existing planes (see the attached) are considered too heavy by the indoor flight purists but fly very well on 17.2 ft. long lines with the lap times 4.7-4.8 seconds. It is not too fast for me and gives me excellent preparation for the outdoor C/L stunt.
Regards,
Matt
 

Offline pmackenzie

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Re: Two motor indoor electric stunt plane
« Reply #6 on: January 19, 2017, 10:49:47 PM »
A double pole arming switch would have two isolated switches. If you did not know how the switch was wired to the timer circuit that would be the safe approach.
Basically you can think of it as two single pole switches mechanically coupled together.

https://www.google.ca/search?q=spdt+switch&biw=1568&bih=852&source=lnms&tbm=isch&sa=X&sqi=2&ved=0ahUKEwjSnf_TgtDRAhVI6oMKHVKxA8gQ_AUIBigB#tbm=isch&q=dpst+switch

Since Keith knows how the switch is actually used (it is his circuit after all) then his suggestion of using a single switch to control two timers can be assumed to be correct. ;)
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Offline Keith Renecle

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Re: Two motor indoor electric stunt plane
« Reply #7 on: January 20, 2017, 06:11:17 AM »
The single pole switch is fine because it simply pulls both inputs down to ground level. Pat's suggestion is obviously a safe suggestion, but in this case it's not really necessary.

Keith R
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Offline John Rist

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Re: Two motor indoor electric stunt plane
« Reply #8 on: January 20, 2017, 09:35:55 PM »
John,
What is "a double pole arming switch"?
For single motor applications ( please see the attached; EMAX2822 was used in both planes) I use the slide switch provided by Keith Renecle with his governors and it has two positions: off and on.
In Keith's diagram of electrical connections for the two motor indoor stunt plane, he used the same switch that allows both motors to be started at the same time.
I have decided to use EMAX2812 motors instead of EMAX2822 in this plane.

The photos and the building log will start appear on this forum in August 2017.

Considering the comment of John Tate: I am not trying to create the lightest possible indoor stunt plane. My both existing planes (see the attached) are considered too heavy by the indoor flight purists but fly very well on 17.2 ft. long lines with the lap times 4.7-4.8 seconds. It is not too fast for me and gives me excellent preparation for the outdoor C/L stunt.
Regards,
Matt
 

Whatever Keith recommends will work.  If he says you can use one switch for two KR timers it must be OK.  Not having seen his wiring diagram I would guess that you use one switch and a Y harness to connect the two KR timers.  The two pole switch I talked about  is effectually two switches contained in one housing with a single lever (or slide) that activates both switches at once.  Example from DiG-Kkey is http://www.digikey.com/product-detail/en/copal-electronics-inc/ES225K12-Z/563-1613-ND/5086582
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Offline Rogerio Fiorotti

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Re: Two motor indoor electric stunt plane
« Reply #9 on: January 22, 2017, 07:55:38 AM »
Pilots,

A question of who does not know about twin engines.

Do both engines have the same rpm or does it necessarily have a difference?


Rogerio

Offline Matt Piatkowski

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Re: Two motor indoor electric stunt plane
« Reply #10 on: February 16, 2017, 01:12:24 PM »
If the flight tests indicate that the build-in 12-15 deg. yaw angle is sufficient to maintain the lines tension in maneuvers, I will not differentiate the RPM of both motors.

M
 

Offline Rogerio Fiorotti

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Re: Two motor indoor electric stunt plane
« Reply #11 on: February 16, 2017, 02:39:20 PM »
Matt,

I have developed a new firmware to work with two ESC's or an ESC and a landing gear chooses as desired.

The timer is passive and you need the JetiBox programming box (Jetimodel).

I do not have time to build a two-engine airplane if you're interested in testing the timer, talk to me.

Rogerio.


Offline Matt Piatkowski

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Re: Two motor indoor electric stunt plane
« Reply #12 on: February 16, 2017, 04:06:12 PM »
Hi Rogerio,
I do not have Jeti programming device so I would have to buy it to help you.
The plane I am going to build (MiniWolf) will use two Keith Renecle's governors programmed for low RPM (below 7,500) using Pickit2.

I have also two KR governors with the retractable gear option. They will be used in the future full size (165 cm. span) electric Wilk (Wolf).

What is the weight of your timer ?

Thanks,
M


 

Offline Rogerio Fiorotti

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Re: Two motor indoor electric stunt plane
« Reply #13 on: February 16, 2017, 04:49:43 PM »
Hi Rogerio,
I do not have Jeti programming device so I would have to buy it to help you.
The plane I am going to build (MiniWolf) will use two Keith Renecle's governors programmed for low RPM (below 7,500) using Pickit2.

I have also two KR governors with the retractable gear option. They will be used in the future full size (165 cm. span) electric Wilk (Wolf).

What is the weight of your timer ?

Thanks,
M


 


OK Alright.

Weight 3gr.

Rogerio


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