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Archive for August, 2015
Posted by Red.Sneakers | Aug 18, 2015 @ 10:55 PM | 5,452 Views

2015 Red Sneakers Airshow Fun Fly
Greenwood Lake Airshow
Greenwood Lake Airport, West Milford , New Jersey, USA

Attended the Greenwood Lake Airshow this year with the family. Had a great time. The program was full of non-stop action. The performers put on an excellent show. New acts this year. Especially liked the Canadian Wing Walker, Carol Pilon & the Raiders Team. Heck we loved them all: Gary Ward; Red Line; FLS Microjet; Greg Koontz; Greg Connell; MegasaurusKevin Russo; Jerry McCart; US Marines; Medivac Heli. The sponsors, organizers & volunteers out did themselves. 2015 had a record breaking attendance of 31,000!

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Posted by Red.Sneakers | Aug 17, 2015 @ 10:31 AM | 5,624 Views

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Sport Cub stock motor amp draw benchmarks for the umx Sport Cub S (SC) while in flight.

Buyer beware with the Sport Cub S stock replacement motors! see Good Bye Horizon Hobbies
=> https://www.rcgroups.com/forums/show...0#post32893537 <=

Conclusion: The Sport Cub stock motor consumes 3ma to 4ma less per minute than the Micro Motor Warehouse CL-0820-15-9T motor. I don’t know if having this much fun is against local ordinance but I got some smiles, waves & compliments while doing the ‘high speed’ testing

Flight plan was to stay close to the airport, no higher than 100 feet, oval or figure eight pattern and dead stick it to the nearest airport when the time expired. Total flight time 7 min. Timer set to 6:40 to allow 20 seconds to reach the runway. It was fun flying without throttle management, just controlling the speed to maintain altitude.

Here are some benchmarks to get you started when using a Sport Cub stock motor, with AS3x & SAFE active, so you can set your timer. The airplane was the SC with Grasshopper upgrade tires, SC motor & stock prop, and navigation streamers. Don’t forget to leave an allowance for Reserve fuel & fuel to return to home. If you want more info on setting your timer, see => https://www.rcgroups.com/forums/show....php?t=2374029

A stock umx Sport Cub S fuel burn rate, in the air, should be approximately:

- Calm to light breeze with no turbulence: 14ma per minute at <45% throttle [low &
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Posted by Red.Sneakers | Aug 09, 2015 @ 09:10 AM | 6,055 Views

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This is the story of my journey testing the Micro Motor (MM) Warehouse CL-0820-15-9T motor on a micro plane. Originally intended for the Champ but eventually installed on the umx Sport Cub S (SC).

Conclusion: I love my MM on the SC. The performance is very good & consistent. Looks like the MM #01 still had some life left in it. Hitting LVC sooner than before seems to be a combination of slightly higher amp draw & weaker batteries. Having a reliable motor back on the SC is nirvana. In the future, I may do some static testing using a different prop to see if I can maintain the performance while drawing less amps. I have ordered the Eagle Tree voltage logger so I can do longer static tests, say 30 second motor run & get the battery / motor / prop performance data. Video "How to solder tiny wires" at the end. Related blog "Micro Motor Benchmarks for Sport Cub", click here

I went back & researched when I started thinking about using the MM. It was back in September 2014. I purchased two motors & asked a question of the company. The simple email turned into a warring opinionated exchange of words via email. We each responded with passion. To the company’s credit, they said if I did not like the product, to send it back & they would issue a full refund. Hum, that just seems too easy.

The MM philosophy is “October 01, 2014: We sell high performance parts for enthusiasts, they require a good amount of skill and knowledge.
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Posted by Red.Sneakers | Aug 08, 2015 @ 01:05 PM | 5,817 Views
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Micro Motor amp draw benchmarks for the umx Sport Cub S while in flight

I donít know if having this much fun is against local ordinance. Had to do some more testing of the Micro Motor (MM) Warehouse CL-0820-15-9T motor & batteries.

Conclusion: The MM is a nice option for those flying the umx Sport Cub S albeit it requires a higher amp quality battery to perform well. This is due to the higher amp draw at WOT.

Flight plan was to stay close to the airport, no higher than 50 feet, oval or figure eight pattern and dead stick it to the nearest airport when the motor started pulsing LVC or time expired. It was fun flying without throttle management, just controlling the speed to maintain altitude. Plus I got a ďthatís coolĒ from a jogger passing by.

Here are some benchmarks to get you started when using a MM, with AS3x & SAFE active, so you can set your timer. The airplane was the umx Sport Cub S with Grasshopper upgrade tires, MM & stock prop. Donít forget to leave an allowance for Reserve fuel & fuel to return to home. If you want more info on setting your timer, see => https://www.rcgroups.com/forums/show....php?t=2374029

A Sport Cub with a micro motor fuel burn rate, in the air, should be approximately:

- Calm to light breeze with no turbulence: 18ma per minute at <45% throttle [low & slow]
- Calm to breezy with no turbulence: 21ma per minute at 50% throttle
- Windy & turbulence: 27ma per minute at 75% throttle
- Calm to
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Posted by Red.Sneakers | Aug 07, 2015 @ 08:10 AM | 5,623 Views
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Just when I thought I learned it all I had to go back to ground school. Having now flown my umx Sport Cub S for many months, experimenting with different batteries & now with a high amp draw motor, I noticed a lower “C” rated battery outperformed a higher “C” rated battery. So I asked a question to the RCG community. The answers were just too good not to archive in a blog.

Why does a 1s - 500mah 25C battery out perform a 220mah 45C battery with a motor that has a peak amp draw of 2.4 amp?

by turboparker
The reason is because all power sources have an internal resistance. The lower the internal resistance, the less voltage-sag there will be at a given current. In general - the higher the LiPo cell quality, the lower its internal resistance will be. Lower internal resistance = higher true C-rating. Factors that have a large effect on LiPo cell internal resistance include: cell construction & build quality, age (LiPo's start to die as soon as they come off the assembly line), number of cycles, depth-of-discharge, discharge current, operating temp, and storage conditions. That's the mechanism behind what we call a saggy pack. ALL packs sag to some degree as soon as you pull any current. It's Ohm's Law. The sag may be unnoticeable in flight at extremely low currents with respect to the pack's C-rating, but it's definitely measurable with a good meter. And because P=V^2/R, power output varies at the square of the voltage. Double the voltage &
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