Spark #2 - RC Groups
Thread Tools
This thread is privately moderated by TheTick, who may elect to delete unwanted replies.
Jan 29, 2011, 12:54 PM
TheTick's Avatar

Spark #2

Almost ready for maiden.

AUW around 12lbs (used cheap fish scale)
Stumax 110-45
Neu 1524/1.5y
CC160hv Medium timing
Gens Ace 30c 12s 5300
A123 rx pack. No regulator. No switches.
Airpower electronic valves for retracts and brakes.
CG 150mm

Full throttle static results with 82mm exhaust diameter:
6375 watts peak. 6kw after 5sec. 5.8kw after 10sec.
Gens Ace pack holds at 44.4v (3.7v/cell) at 131 amps.
CC160hv with cooling fan peaks at 137F after six 10 second runs with 20 seconds breaks between each run at half throttle. Used 3000 mah.

I used a large 5v cooling fan on the controller to avoid cutting vents in the plane. It seems to be doing a good job and only weighs .5 ounces. While running, I can feel the air exit out the tail of the plane. In the air, it should run even cooler. I'm shopping for a non LED fan as this one is obnoxiously bright.

Speed was the focus of this build and I believe I chose the right fan for the task. Hoping to maiden in a week or so. I'll try to get video and radar.


Update: Video of speed runs
208MPH CompARF Spark - 5700 WATTS - FAST RADIO CONTROL EDF RC JET ON RADAR (4 min 4 sec)
Last edited by TheTick; Mar 23, 2011 at 12:51 AM.
Sign up now
to remove ads between posts
Jan 29, 2011, 02:35 PM
Aut Viam Inveniam Aut Faciam
verticalspark's Avatar
I cant wait to see that video! Thats a ton of power!
Feb 07, 2011, 03:36 AM
Automotive Engineer
wyn819's Avatar
Hi Ben! Have you maiden the 12s 1524 1.5Y Spark yet? Can't wait to see the video.
Feb 07, 2011, 12:32 PM
TheTick's Avatar
Sorry I haven't had time to maiden yet. Hoping to maiden very soon. Just need the winds to calm down and coordinate with my radar/cameraman.
Mar 23, 2011, 12:50 AM
TheTick's Avatar
Very happy with the setup. Fly's great and lands easy. Thinking about going to 11s 5800 which weigh the same as my 12s 5300.

208MPH CompARF Spark - 5700 WATTS - FAST RADIO CONTROL EDF RC JET ON RADAR (4 min 4 sec)
May 11, 2011, 06:03 PM
TheTick's Avatar
Flew it on 11s 5800 today. Logger shows 5000 watts peak and average of 4500 watts. Does 176mph with a 3-5mph headwind. This is pretty much in line with the other guys running this fan at this power. Mid to high 170's

Then I flew my 12s 5300 pack. 6600 watts peak averaging just under 6kw. Radar got it at 190mph into a 3-5mph headwind. This is in line with my other runs which prove this to be a solid low to mid 190's.

I couldn't tell the difference in top speed from the 11s, just had to cruise at 3/4 throttle instead of 1/2 throttle. Got about a minute more runtime. Very happy with both setups.

I've only flown the plane on low timing.
May 11, 2011, 08:42 PM
Aut Viam Inveniam Aut Faciam
verticalspark's Avatar
Dang that's moving! are you considering moving the timing up?
Jun 13, 2011, 03:01 PM
TheTick's Avatar
I've thought about moving the timing up, but that still won't get me to 200mph. Maybe mid to high 190's. Low timing is recommended for neu motors and I want to keep everything happy.

I hooked up a clamp meter and compared them to the logger readings. The CC logger reads a bit high. Looks like I'm closer to 5.5kw - 6kw peak on 12s and 4kw - 4.5kw peak on 11s.
Oct 24, 2011, 09:07 PM
Lithium Member
Herb's Avatar
Hi Ben it was nice meeting you at Sepulveda ! Your Spark looks sharp, Herbert
Oct 24, 2011, 10:51 PM
TheTick's Avatar
Originally Posted by Herb
Hi Ben it was nice meeting you at Sepulveda ! Your Spark looks sharp, Herbert
It was nice to meet you as well! Look forward to flying with you.

Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Discussion Need Spark Arrestor Reco Batteries and Chargers 11 Feb 29, 2016 04:09 PM
Help! 2 Stroke no spark help? FighterCat57 Racing Boats - Internal Combustion 10 Nov 24, 2010 03:06 PM
Question CRRC 26R Spark Plugs shuglu72 Engines 3 Sep 18, 2010 09:54 AM
Discussion Shorted lipo, huge spark melted cutters flying-things Batteries and Chargers 65 Sep 17, 2010 08:10 PM
Video TJ100 power Spark 10s 2.7kw Tamjets Electric Plane Talk 0 Aug 08, 2008 05:02 AM