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Ark › Hold it right there tail...
10-06-2005 08:29 AM  12 years agoPost 1
jaseyshef

rrApprentice

Sheffield, UK

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So this weekend I finally got a whole load of updates and modifications sorted on my X400 and I thought I'd drop by and let you all know the results.

Items fitted list:

GY401 (at last)
HDS 877 (on the tail)
HS 56 B (Aileron control)
Flightpower Exteme 20c 1800mah

First off lets cover the HS56B. I'd heard lots of good reports of this servo and as my HS55 was wigging out on the aileron control I thought I'd drop this in. What an improvement, a lot easier to fit than some forums had led me to believe and really precise and powerful. In flight not a huge differnece but it really does give me more confidence over the HS55.

Ok the big one (in my opinion) the GY401 and HDS 877. What can I say, after a lot of fidddling and a little learning (of setting up the GYRO in my tranny properly) I finally have a tail that holds properly, and what a difference. I have the Gyro set up in digital mode and the repsonse is excellent.
The AVCS mode of operation of the GY401 is a realy improvement for me over the way the Alight HH gyro works and the rate at which this thing corrects the tail is very very impressive. I relocated the reciever to the LHS of the heli and dropped the GY401 between the frames at the back where it fits very well.

I was so confident in fact that the single piro I did the other day became 4 in a row continuously, and in both directions. Small beer to many but a big deal to me - and great fun as well.

Only issue was fitting the servo, I use a TREX Boom mount and the brass inserts for the servo wouldn't work with my sorter hex screws, so I had to do a bit of bodget and scarper and make them fit - all good in the end.

As for the Flightpower lipo, in a word nice. I've been using a Kokam 2000 mah for a few months now and really rate it. The flightpower actually outlasted it by 2 minutes, which amazed me. Also lots of power on tap and it didn't get any warmer than the Kokam. The other advantage is that it fits in the frames of the X400 well.

So all in all and after a lot of tinkering - the X400 is flying like a dream, the control is now very precise and it's alowing me to fly it like I do the sim - well the basics anyway!

Next up (and I'm in no rush) is HS56s for the pitch and elevator, and also the cnc elevator parts for the heli.

Now I finally have a new lipo I will be using the EYECAM again as well, as I can now run it in the middle of a field - here we go!

Jase

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10-13-2005 10:00 PM  12 years agoPost 2
tikaboo

rrApprentice

Fylde Coast, UK

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How long do you get with the FP 1800?
I'm only getting 10 minutes with a FP 2100 but then I'm running a 14T. 13T is sluggish.

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10-14-2005 08:32 AM  12 years agoPost 3
jaseyshef

rrApprentice

Sheffield, UK

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11 mins on a 13 tooth

Jase

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10-14-2005 11:25 AM  12 years agoPost 4
tikaboo

rrApprentice

Fylde Coast, UK

My Posts: All  Forum  Topic

Thats interesting....so presumably only 9minutes with the Kokam....always heard good things about that battery so that flight time would annoy me.

Ok I switched back to a 13T today and messed about with the throttle to get it running good. Flight time with the FP 2100 is much improved at 12minutes....possibly could stretch that a bit if I lowered the throttle but not much.

I have 3 HS56hb's & one HS50 for the tail, JR R700 Rx, Ark brushless & Ark ESC.

My AUW is 732g

Pretty much stock apart from lighter t-rex canopy and a small brass plate on the back where I've mounted my RX. Only going eCCPM will allow me to go lighter.

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10-14-2005 04:06 PM  12 years agoPost 5
tikaboo

rrApprentice

Fylde Coast, UK

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Wow my O' Level maths have come in handy for the first time in 20 years....

On average your pulling around 9.8 Amps with your setup:

1800*(60/11)=9818.18

So if I were pulling that then I would get 12.8 minutes flight time:

2100/9818.18*60=12.83

Which is about what I'm getting give or take a few seconds. Never timed it that accurately. So thats good.....means my runtime is about right although it does show that the extra cost of the 2.1 wasn't worth an extra minute and a half. Seems like your 1800mAh was a good choice.

To get a significant improvement, say 15 minutes I would need a 2500mAh

15*9818.18/60=2454.54

And 20 minutes a huge 3.2Ah battery. 'Course I'd by pulling a few more Amps getting that thing off the ground so maybe the sweet spot is around 15 minutes....especially when price comes into the equation...Ooh equations.....I'm having a panic attack....too much maths for one day.

The only way to improve this is to lop off the weight....ie. eCCPM

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