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Old Jan 14, 2013, 04:14 PM
rip
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United States, FL, Niceville
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Question
Electrict Equivalent for 40 Glow Engine

I'm going back into RC... I am building a new plane from scratch that specifies a 40 glow engine... what size is the Electric Equivalent?

Recomendations?
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Old Jan 14, 2013, 04:26 PM
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I don't know. But what I would do is go to Tower or Eflite and find a plane that uses a 40 and see the recommended electric option ( if there is one). Also, on HK some of their motors have info on what the gas counter part is.
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Old Jan 14, 2013, 04:52 PM
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Something putting out around 800-900 watts will do the job. Around a 200-250g motor would be in the ballpark.
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Old Jan 14, 2013, 04:59 PM
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Canada, ON, Ottawa
Joined Oct 2010
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Scorpion are great motors.

http://www.scorpionsystem.com/catalo...II-3026-710KV/

Different RPM ratings for similar motors too depending on what the application is, slow trainer or faster sport planes

http://www.scorpionsystem.com/catalo...I-3026-1190KV/

Or E-flight

http://www.e-fliterc.com/Products/De...odID=EFLM4046A
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Old Jan 14, 2013, 05:18 PM
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Give some idea of your budget, maximum permissible prop diameter and model type then it's easier to get more specific in recommendation.

Scorpions are great quality motors but a bit steep on price. The collet prop driver is a negative for me. On any motor approaching 1kW I much prefer a bolt on prop driver, which for some strange reason the mid size Scorpions don't have any facility for.
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Old Jan 14, 2013, 05:28 PM
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800 watts or so. (ie. "+1" to prior remarks.) These days many motors are billed with a "glow-equivalent" size, or the size is inherent in the product name, as in "Power Up 40". Headsuprc.com may have something useful, check 'em out.

I only have a few planes with motors that size, but so far (knock wood) collet prop adapters haven't been an issue.

I love Scorpion motors but can't afford them any more.
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Old Jan 14, 2013, 07:43 PM
Balsa&Tissue
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A more affordable option is the Power Up Sport 32 or 46 from Headsup RC. I have used both these motors and the 32 is capable of at least 750 watts and the 46 more.

http://www.headsuprc.com/servlet/the...2-Sport/Detail

Headsup Shipping is only $2 in the US. The ship same day and I get stuff in 2 days. Great motors, great service.

Dave
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Old Jan 14, 2013, 08:00 PM
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1 horsepower is somewhere around 750 watts.
A powerful .40 is 1 hp.

As payne9999 said, HeadsupRC is a great source for stuff.
I'd also consider their FirePower .46. It's actually lighter than the FP .40, but much more capable.
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Old Jan 14, 2013, 08:15 PM
rip
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I wouldn't like too spend more than 1000.00 on balsa wood + radio + motor etc...

Doable?

I built this model as a boy:
http://www.hooked-on-rc-airplanes.co...man-plans.html

4 lbs 79 wing span 40 glow engine
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Old Jan 14, 2013, 08:35 PM
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Doable for sure. Lots of options these days for motors and radio gear from basic to fancy.
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Old Jan 14, 2013, 08:48 PM
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40 Equivalent

I would suggest any of the HobbyKing 35mm-42mm diameter motors that put out 600-900 Watts.

Look for something in the 1100KV range if you are going to run a 3 cell (LiPo) battery with a 70-80 Amp ESC or 900 Kv with a 4 cell battery and a 50-60 Amp ESC.

For example, in a 600 Square inch , 6-7 pound sport model I run the NTM3548 900KV motor on a 4 cell 4000mah battery, 60amp ESC and an APC 13x6.5 prop. This combo flys very well with a lot of vertical and takeoffs at about 1/2 power.

With the 13x6.5 it pulls 800 watts on the ground so it could probably safely use a 13x8. It would draw too much power to run continuously on the ground without overheating but, would unload and probably pull no more than 800 watts in the air. It would give me a little more power at altitude.

However the 13x6.5 runs cool and flys well. Gives me about 6-9 minute flights depending on throttle management. It's not a 3D airplane and I don't try to fly it like one. Just the usual loops, rolls, stall turns etc. A generally very pleasant flyer!
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Old Jan 14, 2013, 09:00 PM
Balsa&Tissue
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My Headsup Sport 32 runs a 13X6.5 at almost 800 watts and I have used it with a deeper pitch or 14" prop as well and it pulls my 7 lb P-51B around in a more than scale speed. Have even put the nose directly into the ground and had to extract all the mud from this motor and it still runs great.

I don't go to HK anymore unless they have something I want that Headsup is out of. Don't have a beef with HK but it taks a while to cross the pond.

Dave
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Old Jan 14, 2013, 09:21 PM
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Quote:
Originally Posted by payne9999 View Post
A more affordable option is the Power Up Sport 32 or 46 from Headsup RC. <snip>
Yep, I have two of these fellas (32 size) deployed, one of them on an 84" Quaker, the other on a Mojo 40. The fellas at ProBro speak highly of this motor and its equivalent over at ValueHobby, and often push them way beyond rated limits.
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Old Jan 14, 2013, 09:41 PM
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Quote:
Originally Posted by ripacheco View Post
I wouldn't like too spend more than 1000.00 on balsa wood + radio + motor etc...
Of the items you mention, radio will be the single largest chunk. Breakdown of remaining components for a 40-size plane might go something like the list below -- quality off-brand stuff, unless otherwise indicated:

Radio: $150-$300 (eg. basic Dx6i, Dx7s)
Battery: $50 ea. (but you'll want at least two or three...)
Battery charger: $50+ (including AC or DC input option)
Motor: $30-40
ESC: $30-40
Receiver: $5-$75 ($35+ for name-brand)
Servos: $5-$25 each ($25+ each for name-brand)

The ranges within each category are wider than stated. For better or for worse, you can't assume the less expensive stuff is junk -- or that the more expensive stuff is vastly superior. Sometimes it is, sometimes it ain't.

Headsuprc.com is a good starting point for many of these items. HobbyCity is another. Value Hobby is yet-another, and the list goes on and on.
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Old Jan 14, 2013, 09:45 PM
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Quote:
Originally Posted by rafe_b View Post
Yep, I have two of these fellas (32 size) deployed, one of them on an 84" Quaker, the other on a Mojo 40. The fellas at ProBro speak highly of this motor and its equivalent over at ValueHobby, and often push them way beyond rated limits.
I have pushed mine hard without any issues. I wonder who makes their motors. I have had bearing problems and ESC timing issues with E-Flite motors on occassion at 2-3X the price. Nothing really against E-Flite motors because I use and respect Horizon products but in the end pretty much all these motors are made in China and althought some are really exceptional like Hacker, most of the time I don't need exceptional but just a good, respectable motor.

I think I paid less than $50 for my 32. Man, back in the glow days that would have been $120 plus a subscription to fuel of the month club. However, the batteries for the larger motors are not cheap either but they last a long time if you take care of them.

Dave
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