I have a Focus Sport kit I'd like to build as a first electric pattern practice plane. I need help with appropriate motors and batterys that will give performance comparable to a YS 110 S. The array of motors, batteries, etc. confuses me way too much. I need an easy way to evaluate compared to comparable IC engines. What have you guys that fly electric 110 class pattern ships used successfully?
Thanks, Dave Burton

Look at "Glow To Electic" towards the bottom of the page:

mhtml:file://C:\Documents%20and%20Settings\Owner\Desktop\Downlo ads\AA%20RC%20master\AA%20Power%20calculations\AA% 20glow%20to%20electric.mht!http://www.modelflight.com.au/eflite..._brushless.htm

I think jumper is trying to point to this page: http://www.modelflight.com.au/eflite..._brushless.htm

If you want the power of a YS110 then you need the following:

Batt - 8S 4,000-5,000 mAh (best to use 2 pieces of 4S 4,900 mAh packs)
ESC - 90A HV (High Voltage, means can handle up to no less than 10S)
Motor - something in the 53mm range such as, AXI 5320, Hyperion 4045, Hacker A50 series, DualSky 5060 series
Prop - starting with 18x10

You will be pulling about 50A-60A for no less than 1,500W ... something in the 1,750W range is best. All the best!

Thanks for the recomendations. I was debating between the AXI 5320 and the AXI 4130 with the Jeti Plus 77 amp control. If I go with the 5320 and 2 4S LiPo packs I'm approaching carrying the same weight as the full 2 meter planes. I'm thinking it may turn out a little heavy for the 110 size airframe. Anyone flying the FAI sequences with similar E planes?

Dude ... EP is always heavier than GP till you reach around 120 size.

For planes like 40cc its usually slightly lighter. Example is the Comp ARF 2x2 Extra, was told its only about 13.5 lbs on EP but 15 lbs on gas. So the big EP planes are lighter to a point we need to sling the batts up front at the motor mounting box so that we can get the CG right. Your wing loading will be higher than GP but let's not get carried away because its probably not so much more that it makes the plane fly like a pig. You will have good power for sure.

If you want her lighter you can use 3,700 mAh packs but your flight time will be lower, that's all. To save weight you can also use lower C rated batts but please ensure it will handle the motor amp draw. My pal flies the Integral with 13C 5,300 mAh packs and they are lighter than my FP 25C 4,900 mAh packs. He has no issues at all. He has even competed with that.

In the past people were flying pattern plane like Curares, Angels, Arrows etc. Those were heavy planes (they had retracts too) with relatively lower powered engines than what we have today but they competed and they flew well. I don't think Hanno Pratner had 14 oz wing loadings back then but he is a legend. Well, the debate about lighter is better will go on ...

Just to digress a bit, new 2x2 planes as I have seen use so many weight saving stuff, e.g. small tail wheels, aluminium tubes for fuel etc. If we want to go to this extent then why not:

i. remove pilot or use sponge pilots;
ii. remove pilot headrest;
iii. use titanium screws;
iv. drill UC to lighten it;
v. drill out servo casing;
vi. use titanium pipes & header;
vii. use AAA cells for RX pack, bring multiple packs, 1 pack 1 flight
viii. use wooden props
ix. plastic spinner
x. use pylon plane wheels (you can narrow wheel pants too, less material and more aerodynamic)

See how crazy it can get? Heheheeheheee ...

Keeping the weight down on the Focus Sport as an electric may be difficult. Afterall, it was designed around the use of the YS 110 as its powerplant. No consideration in the design was taken for it being electric. At any rate, I'd still be curious to see if it could be done as an electric at a reasonable weight. Personally, if I were doing a 110 electric setup, I'd just purchase a Sebart Wind and be done with it.

Joe ... yeah ... that's a lovely plane ... Wind 110 ... I love my Angel 50.

Dave,
You might find some useful information in this thread, as the size and weight of my Inspire 90 is similar:

http://www.rcgroups.com/forums/showthread.php?t=708283

IMHO, what you need for the Focus Sport is:

(1) Motor = E Flite Power 110 or ....if you can spend more, the more efficient and slightly more powerful Neu 1512/1.5Y+6.7:1

(2) ESC = Jeti 90 or ..... CC HV85

(3) Lipos = (2) 4S 1P Zippy Rhino 3700's (Hobby City)

Ed

Ed ... how are the Rhinos? I just got wind of the CHEAP 5S 4,900 packs, USD66 only per pack ... ordered 2 for testing then if its ok will go for many more. Now everyone can fly 10S set ups!

I'm running (2) 6S 3700 packs head-to-head with (2) TP Extreme V2 3850 packs. They are almost exactly the same size and weight. So far ..... so good (holding 3.7 volts per cell under 60-70 amp loads). Too early to tell about life expectancy with only 20 or so cycles per pack. But at 1/3 the price .... hard not to like them a lot at this point.
Ed

TQ! TQ!

Would a Hacker A40-10S with 77 amp ESC and 5C LiPo be a suitable combination for a Focus Sport? Anyone have experience with the A40 Hacker?

No, the Hacker A40 is intended for 4-6 lb aircraft and 900 to 1000 watts.
http://www.aero-model.com/motors.aspx

You might consider the A50 14L with an 8S LiPo.

Ed

Thanks Ed,
I'm just trying to use something I have already rather than buying new stuff.
I understand IC cubic inches but the array of stuff to learn in the electric business is giving me head aches.

[/quote]

Thanks Ed,
I'm just trying to use something I have already rather than buying new stuff.
I understand IC cubic inches but the array of stuff to learn in the electric business is giving me head aches.

[/quote]


I understand wanting to use what you have. If the A40 on 5S is flying what you have now well ..... just stay with a similar size and weight plane .... and you should be fine.
Something like and Inspire 60, or similar size and weight "pattern" plane would fly well on the A40 and 5S.
A 90-110 size plane (like the Focus II) is going to need quite a bit more power to fly well. I've been flying this size "pattern type" bird (Venus II, Showtime 90, Inspire 90) for 3-4 years now. I'll be glad to help you any way I can. The learning curve is not that steep, once you get over the first few hurdles .
Ed