hi what size electric motor do you need to replace a ys 110 and have equal or better power?thanks

This is just a guess, but I would say a motor that generates approx 1800-2200 watts. Keep in mind, the manufacturers rate their motors pretty conservatively (probably so we don't go out and burn them up). I am flying an 11 lb pattern plane and using about 2500-2700 watts peak. Some use a lot more... A YS110 is probably 65-75% of the power of a YS140DZ? (another guess) so 75% of 2500 watts is around 1875 watts...... all depends on weight, prop, speed, etc

This is just a guess as I stated......... anyone else with a guess?

Don

Wow! This is a great question!. I would LOVE it if some e-smart pattern wiz would post a matrix of motor/battery combinations and what glow engine they would be equivalent to. I've been wanting to go electric but simply do not have the acumen to figure out all the variables needed to calculate available power from an e-setup. I'm a mechanical engineer BECAUSE I HATE ELECTRONS!

I've spent twenty-five years developing a feel for what displacement is required to power a model of a particular weight and size. Since the motor manufacturers do not use consistent labling (just what does C50XL, or whatever, MEAN?) I can't develop the same 'feel'.

Al,

I'm a mechnical also becasue I hate electrons.

Look at the Eflite stuff. The motors are very good quality and perform well, especially for the price.

The great thing about the Eflite motors is they number them similar to glow engines. When the Sizes get large enough to equal a glow motor at the 10 size its like a 0.10cu in motor...
The call it the Power10

They make a Power 110. This will likely be close in performance to the YS 110...Might be a smidgen lower power say 90-95% of the YS110FZ.

http://www.horizonhobby.com/Products...odID=EFLM4110A

Troy Newman
Team YS Performance
Team JR

hey Troy thanks alot,looks like it would do the trick

Speaking of E-Flite. Does anyone have any experience with the Power 110 or Power 160?

Don

Pappy, I'm an ME too, but I like the simplicity. You only need to know three things.

1. Force=Mass*acceleration
2. Entropy increases
3. You can't push with a rope



I have looked into this too, but am still a little confused. I have seen claims in this forum that assign .110 like performance to 6-cell setups like the e-flite 60. I found a really neat calculator here http://brantuas.com/ezcalc/dma1.asp. I am a little leary about the accuracy of it. If you enter varables that you know are in the ball park, the results seem resonable. Though I have been able to get some really screwy results.

I am considering an AXI 4130-20 w/6 or 8 cells. I will probaly get this set up with one 6-cell pack. If it performs the intermidiate well, I'll get a couple more 6 cell packs. If not, I'll go to 7 or 8. The AXI w/Castle 77A should be able to handle any of those combos.

Troy, I saw you at Riverside and noticed that you were flying nitro. (I'm Dave with the ill-fated Exceleron) In fact, there seemed to be fewer electrics than last year. I do not think electric was just a fad, and it is definatly here to stay. I am definatly going that way because it will give me better opportunities to practice.

The eflite 60 on a 6 cell setup is more like a 50 size glow setup. From experience.

Good to know. I suspected as much.

I have a BL110 with a CC 85AHV running on an 8S1P (2x 4S1P) 5000Mah MaxAmps packs in a Showtime 90. AU weight is 9 1/4 pounds fully charged. 17/8 break in prop for the lipos pulls 45A. The 17/10 pulls 55A. Going to try an 18/8 or 18/10 to get amps to 60-65. Flies very good at 45AMPS, pulls much better at 55Amps. A typical 7minute flight on the 17/8 takes @ 2700Mah from the pack and it is barely warm. 3.7V times 8 cells times 60Amps is 1776Watts divided by 9 1/4 is 192 Watts per pound. A DX7 guides it.
"I like it!"

Dave Rigotti

I have a flying friend using the AXI 4130 in a Venus II and 4200 mah 6S setup. Handles the Intermediate pattern easily.

Woodie

Woodie,

Would you hapen to know what his all up weight is? I am planing to scratch build and want to plan accordingly.

Dave

Why would you want to do that? It will cost you 5 times as much for a moter and speed controler alone

I think he is slightly over 9 lbs, will check with him and if different, I will post here.

Woodie

Thanks, I think I can get a 66'' span plane in at under 9lb. These ARFs tend to use heavier wood than I would, and heavier layups for the FG parts too. I have a set of plans for the Gator Giles that I have reverse engineered, and input into a CAD file. The wings will have double taper, but I like the way Mr. Chidgey designed the fuse. Simple and easy to build straight.

I use a Hyperion 4035-14 spinning a 16x10 prop on 8 cells @ 8150 rpm. It is lighter than my E-flight 110.

You could tach the YS and go into a calc programme and find the watts needed to get the same results with, say 10s and start your search for the motor around that number. E-power would probably use a more efficient size of prop, so it would be a WAG, but a place to start. Tex.

I hate to tell you guys but this is a mechanical engineering problem. You think you know what your glow engine puts out based on its displacement but you can't define it in terms of power. You might know it in terms of rpm with a given prop, but you don't know how to calculate the torque it takes to drive that prop at that rpm. Mechanical engineering is much more difficult than electrical.

Bt the way, the way I was taught, all you needed to know was:

F=MA

E=IR

You can't push with a rope

Jim O

Well torque is a great way to measure to power of a given IC system and current draw is a great way to measure the power of a given e-system, but in the end, its the amount of thrust you produce at the prop.

An IC system produces its max HP at a RPM that is almost never used for flying. We usually run an IC system at about 80% of peak HP on the RPM scale. Thats because of the usable torque available for the prop is more efficient at that speed.

An e-system you can measure current draw but unless you know the efficiency of the of the motor and/or motor/gear box its hard to compare.

In both systems you can measure the RPM at the prop and then do some math to determine "ballpark" static thrust.

In my case I have:
1. hyperion 4035-14 with an apc 16X10 @ 8100 rpm ~ 12.1 lb static thrust
2. YS 110 spinning an apc 15x10 at 9000 rpm ~ 11.6 lb static thrust

These look very compatible but on the same plane fly "a bit" differently. The YS version will fly faster and initially look like it climbs vertically much faster from full speed in a straight line . Down line speeds are faster also. Transition from slow horizontal speeds to vertical maneuvers will look a little more sluggish. Conversely, the Hyperion version will fly slower and initially (compared to the YS) look as if its climbing slower but in a long enough vertical climb, will start to look like its out pulling the YS version. Down line speeds are slower and transitions from slow horizontal flight to vertical will look more powerful.

In the end, these two power systems are very close.

Jim, how are you.

I agree that this is a complex problem. However, it can be simplifed a little. If we had a reliable way to determine the horsepower of a YS.110 and if we had a reliable method for determining wattage of an e-motor then you could do a conversion that will get you in the ball park. You will still have to swing the bat a few times to see exactly how it works.

I wish the ''science'' were better regarding this. If I were to get into a full 2 meter setup, I would just copy What Somenzini and Schulman have already found to work, with help from Hacker. Unfortunatly, guys like that do not fly .110 setups, so we're on our own.

It is not that complex if only it were easy to measure mechanical stuff like horsepower or torque. It would also be very useful if we could accurately measure the power it takes to turn a given prop at a given rpm. Bob Boucher has a prop chart based on theoretical calculations as well as some "factoring" as a result of testing real props. I feel it is a little on the high side (more power than actual) but it is better than nothing. So if you know an APC 15x10 at 9000 rpm is what you want you can find out how much power that requires from his chart. You can then assume an efficiency and calculate the power needed from the electric motor. That part is easy.

I did excactly what you suggest by copying Tony F's setup and it has worked flawlessly for over a year. I wanted something I felt was better than a glow power system and liked what I saw in his plane. However, the beauty of electric is you can select a motor to turn the prop you want at the rpm you want. The only problem is cost and weight.

Have flown the Venus 2 on OS 91 2 stroke, YS110, and Eflite Power 60 6S with a 16X10 prop.

The power 60 in my opinion is equal to the YS 110, and far more power than a 91 two stroke.
Best part is it is less money than setting up with a YS 110....servo requirements are less with the electric setup too, because there is absolutely no vibration in the model.

http://www.rcgroups.com/forums/showthread.php?t=700330

Ed

The link below has a good tool for getting an idea of what motor/esc/battery combo to use for a given type of airplane at a given weight. It's general, but it will get you started. The right side of the page has a section for a "Fast Axi Setup"

http://www.modelmotors.cz/en/index.php