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HomeAircraftHelicopterMain Discussion › want to maiden but have some questions
01-12-2009 06:45 AM  9 years agoPost 1
jjvwg

rrApprentice

Vail/Boulder, CO

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OK, i have my trex 450 all setup and ready to maiden but I need a few questions answered. Let me say that I have been flying for 2 years but this is my first electric and only my second heli that I have set up. I was helped getting my first heli set up but feel that I can handle this on my own now minus the following.

1. I know i need to break in my batteries for the first couple of flights, how much capacity do I want to use? Also, once they are broken in how many mah do I want to be putting back in to the battery? I think I remember hearing 80% but want to make sure.

2. Im running a 401 gyro and 9650 on the tail and was wondering what a good starting point for gain and delay would be, i was gonna start at 60% on gain, but have no idea where to start with delay.

Lastly, I am using a dx-7 and have my gyro sense plugged into the gear channel. What is the correspondence between the gain set in the ATV and the actual gyro gain when done this way. I remember seeing something that they are not the same and wanted this cleared up.

Thanks for all the help you guys, much appreciated.

Jeff

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01-12-2009 07:15 AM  9 years agoPost 2
Anthony.L

rrElite Veteran

Seattle, WA

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Regarding batteries, don't stress over "breakin", some people swear by it but I think it's a complete waste of time. I've owned many dozens of lipos totally over $10k. I run them from the first flight to the last flight on the pack the exact same way, hard.

Now with that said, it's very important to obey the 80/20 rule. This one isn't a urban myth and will certainly affect the lifespan and performance. Time your flights so you only use 80% of the battery's capacity. For example a 3S 2200mah pack that is common in 450 heli's, when you get finished flying and recharge the pack the charger should show no more then 1800mah put back in the battery.

To get a accurate flight time for 80% I will start with something low, like 4 mins of flight time. Fly and recharge, noting how much was used. Keep increasing the flight time until you reach 80% on the battery when recharging.

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01-12-2009 11:03 AM  9 years agoPost 3
predatorman

rrVeteran

Falkland Islands

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You will like the Trex 450, nice little helis...they punch above thier weight.

On the Gyro thing, channel 5 is the normal remote gain channel isnt it? I would have thought that this would matter with the remote gain settings etc.

LiPo's ? I am not a guru on these but I can get up to 10 mins on the packs I use...but thats general zooming about with some yanking and banking..I also carry a mini cam so hover around a lot. I set the timer on the radio to countdown from 8 mins. I can get 10 mins but the tail starts to wag as the motor pulses....I dont like pushing the pack too far so land and get a recharge.

The charger I use is a LiPo 4, its plug and play with no indication of whats going into the pack. I use Thunderpower, there are better pack around...the Kong series look interesting.

Dont ever get budget packs, they really are crap...I had a couple and had a lot of problems with the balancer leads coming apart and so on...one pack would only charge 2 cells out of 3!

Rob

Quality takes........time!

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01-12-2009 01:10 PM  9 years agoPost 4
Jeff polisena

rrElite Veteran

westpalmbeachflorida usa

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I'm with Anthony.L on lipos I run TP2600 6s in my TRex 500 as well as many in a 450 in the past . Lipos seem to like to be run hard just not discharged too low or over amped (If you have too much load for too long)They will over heat and damage. I dont use gyro sense I use ATV to control gain it is more simple start gain at 70% then lower if wagging if not go up until waging starts then back off until is stops.The true test if you can after getting gyro close, fly heli sideways and if tail starts to chatter lower gain more this will keep servo from over working and burning up.

I stole it ,flew it and gave it back ;)

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01-12-2009 03:41 PM  9 years agoPost 5
mferraz

rrNovice

Houston, TX

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Charging
Try and be present for your charging, either during bench time, or while watching TV or something. Lipo fires can be devestating. There are also "Lipo sacks", etc. but I like to watch me firsthand, as the manufactures recommend.

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01-12-2009 05:12 PM  9 years agoPost 6
TJinGuy

rrProfessor

Socorro, NM - USA

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I would highly suggest you use some training gear for your maiden flight. This is not only because it is you first electric (meaning probably your smallest heli so far) but also in case something is setup wrong. If yuo have it setup super fast or if the tail is backwards, you will be very happy to have the gear on there. You said yourself that this is only the second heli you have setup.

I would recommend dialing down your swash settings and throttle curve quite a bit for your maiden also. Work your way into it. On a typical 450 with HS65s I run about 50% for ail and ele on a Futaba 7C. I would recommend more like 30% for your first flight. Plus if you are running a 13T on a 450XL, then I would run about 85% throttle at the max, maybe something like a 0-50-75-80-85 curve.

Anyhow that is just what comes to mind when I think about a nitro guy flying a smaller electric. Hope it flies great and welcome to the world of electrics

- Chris

Team New Mexico
TJinTech

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01-12-2009 05:16 PM  9 years agoPost 7
jjvwg

rrApprentice

Vail/Boulder, CO

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Thanks for all the advice guys, ill take this advice into consideration.

Jeff

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01-12-2009 06:16 PM  9 years agoPost 8
predatorman

rrVeteran

Falkland Islands

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Do fit the training base, I use a hoop as it allows the heli to skid along should something go wrong. The x frame with the balls is ok, I just find a hoop more forgiving and less likely to snag...and you can fly around if you want.
Its worth fitting a small plastic ball on the end of the tail fin...on the bottom...just stops the fin digging in and wrecking the tail rotor.

I use a hoop on my helis whenever testing something out, handy for nose in hovering too...at low level its a life saver...plus helps keep my savings in the Bank too!

Rob

Quality takes........time!

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