Suggestion on motor for a foam

[qxeflyer]

Hi,

Do you have any suggestion for a motor and esc for a 550 grs (w/ bat) foam plane, it is 40 inch wingspan and will run with a 8x3.8 prop and a 3s bat. I do not want speed nor acrobatic capabilities, just slow flight.

Thanks

 

[earthsciteach]

Where are you located? This can make a difference on the brand of motor or vendor of recommendation. Country of location is enough info.

 

[qxeflyer]

Good to know, I live in Mexico and have bought all my previous rcsupplies from hobbyking (international warehouse)

 

[xuzme720]

Hobbyking is a nicely stocked source and can be a great boon to modelers who don't have a local hobby shop.

For your plane, something like this should work well for slower speed. https://www.hobbyking.com/hobbyking/store/__5482__CF_28_05_Brushless_Outrunner_1600Kv.html

 

[qxeflyer]

Thanks, there are some local shops but too expensive, even with import taxes HB is much cheaper.

The motor you suggest says "Factory quoted thrust: 350g+" ; Thrust should match my weight or it is different?

 

[xuzme720]

If you are looking for slow flight and gentle characteristics, a 1:1 thrust ratio is not necessary at all. Most 3D planes are only 1:1 or just better. Sport planes run about .75 to 1 or less. You can go with more power if you want to. Something like this will give you more than you should ever need.https://www.hobbyking.com/hobbyking/store/__12916__D2822_14_Brushless_Outrunner_1450kv.html

 

[qxeflyer]

Great news, I though that a 1:1 ratio was a minimum for a safe flight (for being way above stall speed)

I have a turnigy 2730 https://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=8617

It is rated with a max 470g thrust, do you think it could be safe to fly a 550 grs plane then?

 

[xuzme720]

Absolutely! should be plenty of power.

A good rule of thumb for starting to pick a motor is the watt system.
25 watts-per-pound - airplane is typically hand-launched and won't do much more than just fly around
50 watts-per-pound - airplane is hand-launched, would ROG off of hard surfaces, and perform mild aerobatics
75 watts-per-pound - airplane would ROG off of a grass field, climb well, and perform nice aerobatics
100 watts-per-pound - airplane would nearly go straight up, can handle all the aerobatics

 

[qxeflyer]

Thanks on the tip, really useful.