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Thanks. They can also be found at Balsa Products in packs that will need to be broken down to four cell packs. Are you going to fly E-36? I am currently building a BMJR Kiwi Coupe. I plan to use a GWS 4.8v motor with a 6:1 gear box. I have not decided on a timer yet. I have used the Groth timers and the Starlink timers on brushless motors with success. I am considering the Smoothie with the built in brushed controler and hot wire DT. Does anyone have any experence with the Smoothie controler/timer with a brushed motor? Would anyone else care to share thier E-36 plans?
I was thinking of using my BMJR Amazoom [Amazon??]. It is intended for 1/4A Nos gas, but the instructions mentioned it ended up weighing more than 4 oz. Too heavy!! However, it might work well for the electric event. I need to sit down and figure out what is needed. Geared or direct drive? I imagine that geared is the way to go. But, that is just a guess. Anyone have any concrete equipment lists they might share? I have chargers etc., just need the time and drive to start yet another event!!! It certainly has some appeal, no mess, no fuss, just fly.
DohrmMy Dad is building the Amazoom for E-36. He is looking at a direct drive motor from Ron St. Jean. We have not tested it yet, but it looks like a very good motor for the Amazoom. He calls it the E-38. It weighs 38g. Mr. St. Jean has done extensive testing and has all of the specs on the motor.
My Dad is using the Smoothie to run the motor and DT, with 4) 150ma cells. I expect it will be a great combination. If there is anything I can do to help please let me know.Is it going to be necessary to purchase a large number of batteries and screen them to get the good ones? Just how uniform are these low cost made in China batteries? Will one need a new charger, or can old RC flgiht pack chargers work without damaging he tiny 1/3AAA cells?
Hank, nice to hear from you. Could there be a timer for E-36 in the works? The highest amp draw that I can imagine for E-36 is 6 amps. As to batteries I have heard that SR now has 150ma cells. They are larger than the Sanyo cells but measure out to be 150ma. I think that all of the SR packs are matched cells. I have been using the Sanyo cells and have been satisfied. As for charging I would not peak charge the 150ma cells at more than 1/3 amp. You can always start out low and monitor the temp of the cells and increase the charge rate untill you feel a little warmth. I use a charger that measures the resistance of the battery to determine the charge rate, but I still put a hand on them to monitor the temp. If you are considering manufactoring a timer I would be interested in a couple of them. 🙂
I am still on the fence about a timer. I made some prototypes a year or two ago, and could not even find anyone to give samples to. Everyone wanted 50 amp currents. I feel a mechanical timer has some advantages over the more sofisticated electronic ones. Sounds odd coming from an electical engineer, doesn’t it?
It really depends on the cell or cells. Electric freeflight will take cells to their limits. I would suggest buying a charger that will meter your cells to determine the charge rate. I use a $30 Graupner charger from Hobby Lobby. I will send you a new charger in exchange for a couple of timers 😀 . Hank, I think that E-36 will take off as the most popular electric event to date. If you will produce timers it would be a great contribution to the class. I would love work with you on development if you are interested. I will be happy to share any information that you might be interested in. Jim
How is the battery going to be verified? I mean I can find 1/3 AAA cells that are 185 mah. The one four cell pack I have seen had no marking on it at all. It couldl be anything. A large mah is going to give a long sustained burst of power, so it does make a difference in competition.
What made you pick the GWS motor for yours? Or have you changed?
Good question on battery verification. Vic Nipert would be most qualified to answer that one. I have been using Sanyo cells that are marked. I bought them from Muncie Hobby. I am still working on motors. The best combination for thrust so far is the MM-1 from Penn Vally Hobbies in a GWS 2.8 to 1 gearbox with a 8X6 prop. The problem with it is that it weighs 68g! The GWS IPS A motor with a 8X4 prop makes good thrust and only weighs 28g. Could be that both are good choices. Fly the heavy motor with beter thrust in windy weather for stability and penatration. Motors are easy, timers are the challenge. 😉
I beg to differ. Timers are easy, motors, gears, props, ana batteries are the hard things.
Jim, did you get my PM asking for your em adr.?
Hank, I did not get a PM. I will send you one.
Rudy, I have been using Sanyo 150ma cells that I bought after last years NATs at Muncie Hobbies. They are working great. The batteries that I flew with last year were purchased online as close outs and turned out to be 50ma cells marked as 150ma. Lesson learned. Chuck Groth told me that he purchased 150ma cells from SR Batteries. They are not listed on the web site. I have e-mailed SR, but have not heard back yet. I will post what I find out.
The MM-1 is rated for 4.8v. It works well direct drive or geared. I have used the MM-1 in a GWS 300 size gearbox. You have to epoxy the motor in place. The GWS motors vary, make sure you get a 4.8v motor. You can buy the motor and gearbox together in 3 different gear ratios, or you can buy them separately in just about any combo you would like.This will get you to the 4.8v combo’s http://www.bphobbies.com/view.asp?id=V415757.
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