Archive for April, 2010

Simulator training required. (more of)

Went for a quick fly earlier today with Mini-Titan but ended up crashing it for silly reasons.

Mini-Titan stripped down for repairs

Mini-Titan stripped down for repairs

I wanted to practise doing inverted circuits therefore you have a go and then you relax for a bit before having another go.  Whilst “relaxing” I did a figure of eight but put in the control as if I was inverted.  Hence a one way ticket to the ground.

In order to get to grips with this I have spend an hour or two today on the simulator trying to get this.  It’s so hard.  My brain just can’t compute the reverses required.  I can the the left turn but the right turn is all over the place.  (This implies my altitude is constant but it isn’t but I can control that easier) grrr..

A clean day at last

Just a quick update today.  Weather was perfect for flying today, sunny, light wind and warm!  Finished tweaking the Mini-Titan and got the T-Rex 250 setup perfectly.  Both are now flying great, and doing what I want them to do.  The Mini-Titan with it’s new electrics is running well and feels very smooth.  Those new servos are paying off.

The only thing I am tempted to gripe about is that I didn’t have the guts to try some inverted circuits.  I feel I really want to conquor these.  I know I have enough ability to try it, I just need to get on with it.  Will give it a go tomorrow.

T-Rex 700E

Well it’s now available on pre-order the T-Rex 700E, see it here at Fast Lad’s . TRex 700E Flybarless and with the latest gear then if I had the £969 then it would have to be the heli to have. Being electric it will be as good as the nitroversion but as it runs on 12s then your going to have a fair few batteries and a generator at the field. (Hmm.. actually that’s a poor reason. It’s the repair bill that I’m scared of..)

Result!

Well, the mini Titan is back! Weather was still this evening so thought it was time to try the mini Titan with all new electrics. Up it went and perfect no tweaks needed nothing! Been an expensive one but at least I can get back to practicing..

Brown times solution?

Okay, well what a weekend.  Lets start with the Mini-Titan and it’s electrical gremlins. I took the plunge on Friday night and brought a new ESC and Rx – £113.  As I use a Spectrum Dx7SE transmitter I brought the AR7600 High- Speed receiver. That way it would run at the high frame rate of 11ms. The logic being I could test to find out where my problems were.

So to work.. I changed the ESC for the new one and then started setting it up. After a while it did it’s reset thing again. This clearly means that it wasn’t the ESC and that means I now have a spare speed controller. Therefore the problem was with the receiver so I changed that for the new one and switched it on. Immediately the servos started twitching, which confused me further. I have a spare DX6i transmitter so I binded this with the new receiver and the servos stopped twitching. At this point I was ready to bin everything – so I went to bed.

Onto Saturday morning where I decided to take the transmitters and receiver back to the shop. Once I was there I showed them my problem  – on the Mini-Titan I had Hi-Tec analogue servos.

Spectrum AR-7600 on Mini-Titan

The new AR7600 fitted. Align 410M mounted alongside.

Due to the high frame rate when using a DX7SE and AR7600 receiver the analogue servos can’t keep up (news to me).    Therefore I either had to get a different receiver or upgrade the servos. I don’t need two receivers so instead I had to buy 3 Align 410M digital servos (£70). I went for the metal geared as there was a discount and they should stand up to more crashing.

In conclusion, I think I have solved the problems but until I have a test fly the jury remains out. On the positive side though I have a superb set-up for the Mini-Titan, all running at 11ms. I suppose after 2 years it was wearing out..

Protos down (and out for the moment)..

Not much to say really – after the mornings messing around with the Mini-Titan (will post later) needed a fly so went to the club.  To cut a long story short, I flew it too far away and got in a mess and sent it in hard.  If it wasn’t for the blades the cost to fix wouldn’t be much (reckon £15) but as it’s new blades then that gets to £50.  Too much for me at the moment.  Therefore I need to fly the mini-titan and get on learning some new stuff.  Well pi**ed off.

Brown times indeed :-(

Nightmare.  Total and utter.  Followers of the previous post will note that the Mini-Titan crashed recently whilst I was trying to learn inverted circuits.  I thought it would be a simple repair job and then I could get back into the skies for more fun and learning.  Far from it…

After putting it back together I went for a trim flight, 20 seconds after being airborne it lurched to the left and would not respond to stick input.  It therefore crashed into a wall fairly hard shattering the carbon blades and left me sweating.  Even though I had hit throttle hold it didn’t respond and thus did the “chicken dance” on the floor.   Worried me as it could of hit anyone.

Despite this I put it back together and tried again.  Didn’t do much just trimmed the heli and then left it for the night.  This evening I thought I should get to the bottom of it so I went up to the field and spooled her up.  After taking off I noticed lots of vibration on the tail so I was just monitoring it when it flipped inverted and hit the deck hard.  However when I got to the heli I noticed the receiver was flashing indicating a brown out.

Hmm.. this got me thinking so I put re-plugged the battery in an started wiggling the wires. Nothing happened and then suddenly it resets itself!  So I try again at the same point and nothing! I keep trying for a bit and then I touch around the front again and it resets itself.  For those that know the Mini-Titan then speed controller is at front and this all indicates a loose wire in the ESC (speed controller).

I have just spent the an hour or so in the cellar trying to create it again, by waggling everything but I can’t make it do it again.

Conclusion: We have to assume something in the electrics is causing a brown out and re-setting the on board electrics. It has to be said that this has been the heli I have had from the start and has so many crashes it’s hard to remember.  Maybe the ESC, Receiver, servos need replacing?  I had to replace the gyro and tail servo 3 months ago because they had started playing up. Either way the Mini-Titan is grounded until I can find the exact component.   My gut feeling in that I should get a new ESC (£40) and a new Rx (£65 for the 11ms frame rate) to be safe.  I mean after all the crashes I guess things wear out?  Problem is I want to practice my inverted stuff and the 450 size heli’s are the best for this.