Electric Power

[George Fruhling]

I have a Genesis .46 I started building years ago. Have a Supertigre .46 but was thinking about trying electric power for it. Is there an electric motor out there that is suitable?

[Howard Rush]

I'd ask Bob Hunt for a recommendation. 

[Brent Williams]

I have a Genesis .46 I started building years ago. Have a Supertigre .46 but was thinking about trying electric power for it. Is there an electric motor out there that is suitable?

Welcome to the forum.  There is a dedicated electric section where you can do your research and find so much good information. 

https://stunthanger.com/smf/gettin-all-amp'ed-up!/

The Cobra 3515 would be a great choice for that plane.

[Ken Culbertson]

Welcome to the forum.  There is a dedicated electric section where you can do your research and find so much good information. 

https://stunthanger.com/smf/gettin-all-amp'ed-up!/

The Cobra 3515 would be a great choice for that plane.

The 3515 is a .60 size motor, the 2820 is a .46 size.  It depends on how heavy your ship will be which one is best.  My 3515 chews a 6s 2800 down to about 35% and a 5s/3000 to about 30% on a 70 oz plane. Either battery powers he ship just fine but the 6s runs cooler.  A 2820 will pull any normal weight (40-50oz) .46 size ship using a 4s and mine really hauls with a 5s and you have saved as much as 5 oz in the nose.  The price differential is next to nothing so decide based on the weight and go with the bigger one if you can't decide.

Regardless of which one you chose (and I wouldn't hesitate to go electric), find someone to help you with the basics.  "Freshman" mistakes in electric can cost you real $$$ real fast but they are so easy to avoid if you know what they are.

Ken

Ken

[Crist Rigotti]

Go with a Cobra 3515.  They run cooler.  Trust me.

[Ken Culbertson]

Go with a Cobra 3515.  They run cooler.  Trust me.

Trust him - he is right but there are two mitigating factors in retrofitting an IC design with e-power.  Nose weight and fuselage width.  The 3515 is considerably wider and heavier that the 2820.  Since I have both and I think Crist does too, I would always go with the larger motor IF it will balance and fit.

Now some advice that is not anywhere in all these very valuable postings - DO NOT touch a red wire to a black wire.  We run somewhere between 14 and 22 volts.  You car starts on 12.

Ken

[George Fruhling]

Which is closest in weight to the Supertigre and muffler?

[John Rist]

Which is closest in weight to the Supertigre and muffler?

It's not just the motor.  it's motor  & battery.   It's all about correct CG without adding lead weight for balance.    Battery choice is the big weight factor.

[Ken Culbertson]

Which is closest in weight to the Supertigre and muffler?

That is not as simple as it sounds.  You have four components to the electric that all have wide weight ranges.  The heaviest component will be the battery (fuel tank FULL), followed by the Motor (engine w/o muffler), ESC and Timer and a couple of ounces for all the the wires and connectors.

To get a valid comparison you need to add all that up and subtract the weight of a tank full of fuel.
Quick weights - Motor 2820 4.87oz  3520 6.28 oz  Batteries (5s) around 10-12oz  ESC 2oz So we are looking at 15-20 oz.  i don't have the ST46 weights but I think with tank and fuel it around the 15 oz.
HOWEVER, either motor itself is considerable lighter that the ST46 so you have a different weight distribution with electric as more weight is shifted back.  AND,  you don't have the vibration of an IC so the nose itself can be built lighter.

Ken

[peabody]

Bob Hunt flew an electric Genesis at Bernie's event last weekend.... Bob said that it's repowered several times.
Handled the wind very well....
Mike Waldron has an electric Genesis that flies VERY well,,,
I believe that electrics like a bit thinner wings, which puts the Genesis right there.

[Ken Culbertson]

One thing I forgot to ask was how far along with the build are you?  If you can widen the nose just a bit or get your hands on one of the E-conversion kits for the Genesis then the bigger motor is the best.
There is enough to learn about electric without having to fit a motor to a plane your first time out.  Follow up on peabody's post and find out what Bob and Mike are using and copy it.

[Crist Rigotti]

Remember that electrics generally like a further forward CG. 

BTW, the specs on the Cobra 2826 is 171 grams while the 3515 is 178 grams.  Diameter of the 2826 is 1.378 inches, while the 3515 is 1.693 inches.  The Cobra 3515 is 1/4 ounce heavier and 5/16 inches wider.

[Ken Culbertson]

Remember that electrics generally like a further forward CG. 

BTW, the specs on the Cobra 2826 is 171 grams while the 3515 is 178 grams.  Diameter of the 2826 is 1.378 inches, while the 3515 is 1.693 inches.  The Cobra 3515 is 1/4 ounce heavier and 5/16 inches wider.

I was referring to the 2820 which is 138 grams, 1.4oz lighter.  The choice between the 2826 and 3515 is clearly the 3515.  I have a 2826 and it doesn't seem to be much different from the 2820 on a 4s.   Still haven't figured why to the C/G thing but it is true.

Ken

[Crist Rigotti]

I was referring to the 2820 which is 138 grams, 1.4oz lighter.  The choice between the 2826 and 3515 is clearly the 3515.  I have a 2826 and it doesn't seem to be much different from the 2820 on a 4s.   Still haven't figured why to the C/G thing but it is true.

Ken

Ken,
Oops, you're right about the 2820.  I missed that.

[Dan McEntee]

   I just HAVE to interject here that you could just install an LA.46 with muffler, and be done and flying by now!!
      Type at you later,
   Dan McEntee

[Crist Rigotti]

   I just HAVE to interject here that you could just install an LA.46 with muffler, and be done and flying by now!!
      Type at you later,
   Dan McEntee

Yeah, right.  how many over/under runs, too rich, too lean, hard to start in cold weather, bad glow plugs.  Just push a button and go flying time after time!   

[Shug Emery]

I have a Genesis .46 I started building years ago. Have a Supertigre .46 but was thinking about trying electric power for it. Is there an electric motor out there that is suitable?

If you are new to electrics; the press and play systems from RSM are real good. I have a few and they saved me time.

RSM 46 Competition Level Electric Power System equal to .46 glow power. Includes a RSM Black Tiger 3548C Motor, 45 Amp Speed Controller, KR Flight Manager, 3300 mAh 4 cell 30C Battery & 12X6 E Pusher Prop. Comes with all programming installed. This power system is ready to be installed in your model. Just flip the switch and fly!
http://www.rsmdistribution.com/index.php
Shug

[Ken Culbertson]

   I just HAVE to interject here that you could just install an LA.46 with muffler, and be done and flying by now!!
      Type at you later,
   Dan McEntee

I hate to break your heart but I am replacing an LA46 with a Cobra 2826 this winter in my competition Profile.  I will be sure to hold an appropriate retirement ceremony.

Ken