LS171Malibu

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What are some of the set-ups you guys are using that are flying SPA with electric power? I'm having trouble figuring it all out.

J Strong

My Feedback: (18)

Subscribe to the SPA discussion list and Ed L. Can give ya direction.
Pretty simple really, once you put the numbers where you want them. The Scorpion 4025, and think it was the 515 kv Version is a power house. But all you should use is 1300-1400 watts, so it doesn't even take that large a motor, but it's a good one.

J Strong

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I can sendf you a 1300 setup on a 5 cell lipo that cost less than $75

LS171Malibu

My Feedback: (16)

Thank you, I would be very interested in that. I have looked at Scorpion before, they are nice. I guess my problem is that when I use the flight calculator on Castle's site, I just can't seem to put together combination that is interesting. What is the prefered propeller?

I was on the email list, and I could not not read and delete the messages fast enough, there was so much!!

codycarlisle25

Just curious. How is the 1300 - 1400 watt number figured. Is that like a .61 swinging an 11 x 7.5 at 13,500 and that power figure converted to electric? Seems like with the engine disp. numbers increasing makes switching to electric make more sense than ever. Especially true if the powerplant is available for the $75.

J Strong

My Feedback: (18)

Think the number is 746 watts per hp
All the rules for El in SPA is on the seniorpattern.com website
Also Ezone website is a great information site.

doxilia

My Feedback: (3)

Cody,

Your typical 61 size engine puts out a little under 2 horses. Power in Watts is not an electric conversion, it is merely the SI unit for power. If you look at the specs of cars manufactured in Europe, they will typically give engine power in kW. Actually, by law I think they are required to.

In any case, 1 hp ~= 746W so it's easy to see that the 1400W electric motor power spec comes from the power equivalent of a 61 glow engine (1.9 x 746 = 1417W).

In the 1700's Scottish engineer James Watt used to compare the power of steam engines to draft horses, hence the origin of the imperial hp unit. Given your surname (I'm assuming), you and James might have enjoyed a dram back in the day.

David

codycarlisle25

Thanks Jamie and David. That really helps me grasp the 1400 watt figure. I really think I will be trying electric for my next new classic plane powerplant. I have way too many of the (old rule) glow engines to justify buying any new ones that make them obsolete. Don't get me wrong I will always have something glow powered flyable, just not anything I will ever use in SPA circles. That is alot of worry on my part as I have never participated in SPA, but I would like to a some point.

PatternPilot

My Feedback: (58)

codycarlisle25


Electrics are able to be used in CPA also

80sPattern

I successfully converted a Conquest IV to e-power.

Ihave a Scorpion 4025-10 motor and run a 6s system. At nearly 1600 watts Iam very happy with the set-up. The APC 13-10e is the best prop and it turns 10,800 static at sea level.

Take a look at the build thread and you can see the process that Iwent through to decide on the power system.

www.rcgroups.com/forums/showthread.php

Good luck and enjoy.

Doug

MTK

An apc 13x10 turning 10,800 is very close to where we had our piped 61's at 25 years ago. Anything from a 12x11 to a 13x10 produced great power for the 7 1/2 lb planes we flew back then

codycarlisle25

Scott,

Sorry I forgot to mention CPA. Too many cool planes to overlook. I am still chasing all those piped fire breathers that I couldn't afford back in the day, but dreamed of and have now acquired. I look forward to trying out everyone of them first, then I will aggressively pursue the electrics. I just wanted them(F.I.R.E.) for too long to skip them......I still can't wait to get them going!