T-Rex 500 Info

[Edders]

also I had a little problem with the balance but was able to fly for 20 minutes

[Mike W]

Hope ya bring it next time ya up this way Edders

[Tim Procter]

5000mAh Battery..



Bet yer canopy wont fit on there...

[Symon]

also I had a little problem with the balance but was able to fly for 20 minutes

20 mins! FANTASTIC! You could always carry it under the heli lol

Was everything else on the heli happy? lol

[TrexMADuk]

just tried my 4500 - 30C EVO will fit and balance is way front but cant get the canopy on...but a 20min flight

[barney]

How did you guys get on with setting up in the Radio on the recommended rod lengths..I ended with +15 or more and -10..

In the end I just set the servo arms 90 deg to the servo and not the rods but cant see it making hardly any difference. In the end I set the whole head 90 deg all the way up and still had to change endpoints in the radio to even it out + to -..

A tip for those using the 9650 servos is to mount the RX on the rear Gyro mount on top of the boom as it saves running extensions from the front servos.

I'm using a spartan 760DS which is very compact and can use a firm mounting without issue so there was room to fit it inverted under the boom..but you could possibly use the rear gyro mount but you may have to stiffen it a little first as its a little flexi. My DC-UP is below that on the base plate between the frames.

Flew really well except it flew a bit 'heavy' with the 4200's. BTW Bloddy tight squeeze under the canopy. My impression is the rotor disk dia is a little small at this AUW.

I also flew using 2170,s and it performed surprisingly well..really nimble..a little low in the power stakes but very acceptable... Providing the batteries are warm they were fine as later flights with cold batteries were poor till 2/3rds through when they started to warm up properly.

Be decision time as what to get soon. The ideal size cells are just not yet on the market..first to produce a good 25/30C rated 2800-3000 for 6S will be ££££'s in.

5S..may be a reasonable option with the right pinion as the battery used will likely have a higher Mha to start and superior C rating under load..3300+ ish. but not sure if it will have the punch a 6s can give.

My initial thoughts are to try and keep battery weight under 450g if poss on 6S.

The 4200 Revos in 5S guise would come in around 100G lighter than 6S and just possibly be a good choice????? maybe still a little heavy, but the Revos at this size certainly show less voltage drop..

Oh for a unlimited bank account

[Ashley Davis]

post removed coz I can't add up

[raptorheli2]

barney, you obviously dont remember me telling you about the rod lengths, old age eh..lol

i had same deal and everything is at 90 and level, there is something not quite right mechanically and i'm gad it's not just my heli or setup showing it. all you can do is adjust it out the best you can. i adjusted all the links a little so i could still keep the mixing arms level at 0 ish now and run 12-12.

5s though...........ZZZZZZZZZZZZZZZZZZZZZZzzzzzzzz

i'll have a 5s setup tested soon enough with 4200's.

cheers

[trvo]

hmm, I didn't read the instructions when doing the mechanical setup (I think Ash vernier'd the links when he put it together tho) but mine came out at zero centre with +/- 12.5 on first setup with equal end points on the cyclock?

Trev

[raptorheli2]

i set all mine up with a link gauge and as per factory settings and it is impossible to get them even and keep everything level on my own heli, not a major deal however as i mentioned. perhaps mine and barneys kits are the scottish editions or we were on the old brew during build.

cheers

edit, going to try and fly the 3000 pack today to see if it holds the HS like 4200's.

[trvo]

Would be interesting to see how the 3000's hold up. I think if we get the same headspeed holdup then it will be the ideal pack.

FYI, attached my cyclock setup screenshot. Whoops, just noticed I forgot to switch it over to digital servos, must get round to that

Trev

[raptorheli2]

trev, there is one major problem re the 3000 pack, i thought ash mentioned as i was speaking to him.......it doesn't fit in the heli. i have had to modify (dremel) my battery tray and frames to get them on there for a test and even at that it wasn't working out so they are on top tray and canopy has no chance of going on. all we will get from the test is if the C is enough.

cheers

[trvo]

doh, I seemed to remember Ash saying something like that to me a few nights ago...

Trev

[trvo]

A stab in the dark - but the Futaba gear centres at 1520us, whereas JR/Spektrum gear centres at 1500us. The cyclock 'outputs' 1520us but the input can be anything (which you specify) which means that it's converting the 1500us to 1520us for the servo centre signal output. Just guessing but maybe your setup is out because you are getting unequal or disproportional 'physical' throws on your servos due to the design of the Futaba signal range being slightly offset at centre to the JR tx output? (I believe both use a signal range of 1ms to 2ms meaning that Futaba centre is not 'true' centre on a JR system).

I've always had problems with JR tx and Futaba servos with unequal travels but the cyclock doesn't have that problem.

Trev

[ChrisB]

trev, there is one major problem re the 3000 pack, i thought ash mentioned as i was speaking to him.......it doesn't fit in the heli. i have had to modify (dremel) my battery tray and frames to get them on there for a test and even at that it wasn't working out so they are on top tray and canopy has no chance of going on. all we will get from the test is if the C is enough.

cheers

Wont be buying one of them then unless the 5s will fit,with my Dremelling skills i would have no heli left