Gas to electrict conversion

[Waggs]

While I was at a yard sale I picked up a few R/C things. One, or should 2 I should say, was a brand new, in the box a ChangsSun 90mm edf which included a new in the box Turnigy SK3 8S inrunner motor. I paid $20 for both. Since I was the only person interested in any of th R/C stuff, for another $10 I got a 1:10 scale R/C Ferrari and a junker, who knows what, low wing tail drager with an OS Max 10 motor.
I was thinking both the car and the ??? plane might be fun to play with. What electric motor would replace the gas one? I'm through with gas and the messses it makes.
I think for $30 I couldn't go too wrong.
BTW can you get a charger for use from your car?

[xviper]

Having an OS 10 motor doesn't necessarily mean it was powered correctly. It may have been way underpowered. You must look at the total weight of the plane and go out and do a survey of all planes of a similar size and configuration (say Motion RC's site) and see what powers those planes. Then you will get an idea of how to power this one electrically.
With regards to the 90mm EDF and 8s inrunner, you need to check to make sure that the fan is actually compatible with that motor. Given the kv of the motor, the fan may not survive at those rpm. You will also likely require a HV (high voltage) ESC to go with that.

[Waggs]

As for the motor and fan, that combo is sold by Hobby King as a matched system, so I would think they were meant to be run together.
The junker plane had the motor mounted in it. It's a balsa build and maybe weighs 2 or 3pounds.

[xviper]

I wish you best of luck with your new acquisitions, but sometimes things aren't as they may seem or as we may hope them to be. Further research and effort may be needed to make it work.
Having a "match" set, especially from HobbyKing doesn't mean they are a "drop in" fit. I had a similar "matched" set EDF and SK3 inrunner from HobbyKing. The fan was so out of balance that it over amped every ESC I used. After trying a 200A ESC and having it still over amp and cut off, I threw the thing away.
As for the Junker, converting to electric isn't simply a matter of knowing what gas motor was in it or how much it weighs. You don't know if the plane ever flew well. It may have been a handful or barely flew at all. A simple answer would be to replace an OS 10 with a "Power 10" motor (as in Eflite) but even then, a Power 10 Eflite motor comes in different KV and runs on different size of prop and ESC. Going electric involves the determination of what size of electric, what kind of kv, how many cells will work best, what size ESC will work best for the given plane and what size and pitch of prop you need or would like to use. That's where looking at commercially available planes of a similar design and weight will be very helpful.

The simple answer would have been ........................ Great! That EDF and motor will be a beast. Throw it into a plane and go have fun. And that Junker, go with a Power 10 and go have fun. That would have done you a huge dis-service and could lead you to a fan that will explode in your face and cause a lot of damage or may not even get a plane off the ground. And simply telling you what motor to put in leaves too many other variables that must be considered. The bottom line ............ For 30 bucks, you could have done very well for yourself but on the other hand, without all the details, a LOT can go wrong.

[Waggs]

Wow Viper, after all that I think I'll just go back to racing boats.

[xviper]

Boats sound like a lot of fun but they operate in a 2-dimensional world (unless you sink). Add the 3rd dimension and failures can be very unforgiving. On the other hand, if a beginner were to come to you for help with racing boats, I'll bet there's a "ton" of stuff you'd tell him to make sure his experience is positive.

[Waggs]

I don't know, there are times you can catch a lot of air time. LOL. I did use to fly R/C I'm just getting back into it and with all the new equipment out there and better performance I just need to come up to speed.

[doctormike]

I use a Jump N Carry (12 V car starter). I hook up my I-Charger to it. Charger clips to the starter clips. It works great. The Jump N Carry looses very little voltage after a day of flying. Doc

[xviper]

I use a Jump N Carry (12 V car starter). I hook up my I-Charger to it. Charger clips to the starter clips. It works great. The Jump N Carry looses very little voltage after a day of flying. Doc

This is a good option if you like to charge batteries at the field. There are many balance chargers that will clip to your car battery, just look for ones that say "DC" for input power. However, be it known that if you charge too many mah from your car battery, your car may not start at the end of the day. This has happened to 2 fellow flyers at my field. They needed to be boosted to get home. The last guy at the field had to call for the auto club truck.

[doctormike]

That's why I use a Jump N Carry. Doc