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| Electric Jets Discuss electric jets in Canada. |
Topic Review (Newest First)
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| 10-02-2015 07:25 AM | ||
| 4stripes |
Re: Fiberglass FlyFly BAE 90mm Hawk in 2010 Anniversary scheme Here is the problem I see with two batteries (a separate RX pack and main flight pack) required to fly the plane. The pilot has to maintain and charge two batteries. With one battery supplying the plane the pilot has less to worry about or mess up. Even if the main pack drops in voltage due to one cell failing completely the BEC has plenty of voltage to operate and supply full RX voltage. At this point the plane has no thrust and is gliding or limping along to land but still under control. With a two battery system, if the RX pack drops in voltage due to failure or lack of charge the plane is doomed just like mine when the power was removed to the RX. My crash was due to a cold solder joint and not BEC failure. I pointed out the issue in order to help others prevent a similar problem. Simply inspecting the components can prevent the failure I experienced. The same type of failure can occur with different receiver power systems like the two battery type suggested or others as they all rely on proper connections. |
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| 10-01-2015 08:55 PM | ||
| airbourne |
Re: Fiberglass FlyFly BAE 90mm Hawk in 2010 Anniversary scheme Quote:
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| 10-01-2015 08:00 PM | ||
| 4stripes |
Re: Fiberglass FlyFly BAE 90mm Hawk in 2010 Anniversary scheme Tested the gyro and receiver in another plane for a couple flights today and they worked fine. Everything points to the cold solder joint that let go. |
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| 10-01-2015 05:20 AM | ||
| 4stripes |
Re: Fiberglass FlyFly BAE 90mm Hawk in 2010 Anniversary scheme Any wire has a solder joint, including a battery. The BEC did not fail. I still believe having a separate RX battery is not safer as it requires extra maintenance from the pilot. Batteries are more prone to fail than today's electronics. |
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| 09-30-2015 10:33 PM | ||
| airbourne |
Re: Fiberglass FlyFly BAE 90mm Hawk in 2010 Anniversary scheme Sorry to hear about that, this is a fantastic looking and flying model, almost got my hands on one! It's also one of the reasons I have gone 'bec' - less in all my nice composite jets, instead going with 6.6V LiFe rx packs to eliminate a potential point of failure. |
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| 09-30-2015 09:58 PM | ||
| 4stripes |
Re: Fiberglass FlyFly BAE 90mm Hawk in 2010 Anniversary scheme Bad news. The Hawk is no more. I installed the Hobbyeagle A3 Pro SE micro gyro and made a flight last week. After a couple circuits I was preparing to land when all of a sudden the plane began rolling. I tried to correct but the plane had a mind of its own and crashed. At first I suspected the gyro but when I found the wreckage I noticed the wires feeding the BEC had pulled out of the board. Today I tested all components and the first thing I noticed was the positive wire that pulled off the BEC had no solder on the strands of wire! The wire strands had pulled off the the BEC board. The negative wire did have a little solder but it was clear that the positive lead was a cold solder joint. After re-tinning the wire and soldering to the BEC all components worked properly including the gyro. The poor solder joint was under the blue shrink wrap of the BEC so I never noticed the lack of solder. If you have used the Hobby King HV BEC like the one picture here, take off the shrink wrap and check the connections. |
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| 05-27-2014 08:46 PM | ||
| 4stripes |
Re: Fiberglass FlyFly BAE 90mm Hawk in 2010 Anniversary scheme Bad news, my schedule came out and has me working that weekend! Very little chance to get the time off as it is unlikely someone would work my weekend in exchange for me working their weekday shift. I'll try to do a switch but I figure less than 10% chance of it happening. |
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| 05-27-2014 06:43 AM | ||
| ken park |
Re: Fiberglass FlyFly BAE 90mm Hawk in 2010 Anniversary scheme Quote:
Ken |
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| 05-26-2014 08:52 PM | ||
| 4stripes |
Re: Fiberglass FlyFly BAE 90mm Hawk in 2010 Anniversary scheme Getting back to the sound of the Mercury fan on my video... I flew it a few times again today and felt the fuselage at high power to check for vibration. It definitely has some slight imbalance. I will take the fan out to try and get the balance as good as my other fans. I never ran this one in a test stand because after running my other T33 fan it ran very smooth, and didn't think this would be any different (but it is). Sounds nice in the air, but perhaps with a little tweaking, it may be better. |
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| 05-25-2014 05:11 PM | ||
| 4stripes |
Re: Fiberglass FlyFly BAE 90mm Hawk in 2010 Anniversary scheme Did 4 more flights today in some gusty winds. It gets rocked around when slowed down so I still think I'm coming in a bit fast. Although the real aircraft may be a jet trainer, this model is not easy to land on a confined runway. More practice needed! here is a video made today. Apologize for the cell phone video quality.... https://www.youtube.com/watch?v=B5qy...ature=youtu.be |
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