T-Rex 500 Info

[Tim Procter]

a decent number of kits arrived yesterday (more than 30).

And where are these kits now Ash..

Obviously its christmas day and nothing will be dispatched until after the holiday period but where will we be looking to purchase one of this batch..

[Ashley Davis]

I believe they all went to pre-orders but I'd check with skyline and see if there's any left over.

[ChrisB]

Any confirmation that there are G10 ones?

[mattie-lodge]

10,100 views this tread has had.

Quite popular then!!!!!!!!!!!!!!

[Ashley Davis]

Any confirmation that there are G10 ones?

No info on that, I know there were far less G10 than CF ordered on the whole but whether any were in the shipment I don't know.

[barney]

Hi guys sorry for not getting back sooner, Xmas with the Family and all that comes first I'm afraid.

WOW Trev.. WTF was that all about...all bow down Trev is coming! At no point have I questioned your flying abilities in fact I commented to the contary. (JFYI I placed first at washing the dishes today and 3rd in a field of 7 masters flying in a comp 07)

I'm not prepared to get into a huge flamewar over this so lets get on with our lives and share the relavant information that will likely produce the best outcome that will benefit others.

OK lets get the facts together we already know. Pack weight is certainly best kept under 500g preferably a bit lower. Generally the bigger the pack the better it maintains its 'C' rating under load as I pointed out in another post..

Performance Aircraft fly best when kept light for a number of reasons and whilst momentum is useful in some areas, overall it compromise performance.

Why do I keep banging on about this..? the advantages are huge and have been proven countless times over the years.

An obvious example being the light heli will climb faster for the same amount of pitch as a heavier model.. The benefit is greater efficency which equates to longer flightimes or if you wish allows you to utilise more pitch to increse the climb rate further.
The model also carries less inertia so it can start/stop more quickly and efficently. This applies to all the controls, less movement = improved flightime or can be traded for increased agility.

Obviously there is limitations to how far this is of use to us. Anyways, heres some common pack weights to put you in the picture but bear in mind Manufactures figures can be deceptive depending on the way they actually arrive at these figures + the pack needs to be able to sustain a reasonable C rating..

2 x 2100 = 310g, 2 x 2200 = 348g, 2500 x 6S = 418g 3300 x 6S = 515g, 2 x 4200 = 620.
Other options being 3300 5S = 442g 3700 5S = 478.

The 2100 is being stretched, and the 2200 possibly a little too much. The 2500-3000 being about right, going much beyond this starts to incur a weight penalty with diminishing returns.

Ref, your early dampner failure this seems pretty much normal with the Aligns but running with the heavier packs certainly wont be doing them any favours.
I'm not certain if shimming will work like it does on the 600N. At this size of model (500) I imagine it would be difficult due to the lower centerfugal pull on the grips to arrive at a suitable result. As Paul mentioned a tube as per 600?..A change of material may be a better option till something arrives.

Tail servo choice..Full size or Mini..well TBH I'm not sure on this one at the mo, as I've only flown the 9650 or the hi-tec50/55 + Ace whatever it was on the small models.
Since the weight of this model is in new territory even for the likes of the 9257..we will have to wait and see.

Trevor the CSM560/720 is a little picky setting up on the small models, and as you have found needs a little tweeking to the Acceleration gain. Did this still stand when you moved to the full size tail servo? just interested to know or is it model size related.

Cheers

[Boggy]

you don't want to get into a flame war?????
fooled me dude

[trvo]

Trevor the CSM560/720 is a little picky setting up on the small models, and as you have found needs a little tweeking to the Acceleration gain. Did this still stand when you moved to the full size tail servo? just interested to know or is it model size related.

Nope, with the 8900 it's the same settings as my Trex 600e and n - stock. I've tried other gyro's with mini servos and get the exactly the same 'disconnected feel' as on my 500 everytime on Ash's 450V2. I think mini servos are just not up to the job, gotta be sacrificing something to fit it into that smaller case. 8900's sweet on the tail though

Trev

[barney]

Hi Trev I just had a gut feeling as to whether it was heli size or servo related. I've got a 9257 sitting here waiting patiently for my 500 to arrive. I still have a 560 left but the 720's are now gone but do also have a Spartan to try.

The Spartan seems to have a more agressive grip so be be nice to try it on something small.

cheers Brian

[trvo]

It's not the hold that is the problem, it just feels disconnected and slow to react. I tried the 9257, only a slight improvement over my 9650. It's servo size related for sure. Next step is some CF tail blades...

Trev

[Fixxxer]

Is this in any way connected to the thread on helifreaks concerning adding weight to the tail grip bolts ? For those not familiar it seems that on the 450 size helis additional weight takes alot of load off of the servo and makes response far better. Now the 500 tail being that bit bigger but using the same servo surely will suffer the same problem to some extent so weighting the 500 tail likewise might provided the answer to running a small servo well. Then again if it is fine running the standard size servos then perhaps it's just more messing than it's worth. Just a thought

[barney]

Fixxxer there is quite an extensive discussion about this on RR some time back I think the title is Chinese weights on the tail.

A lot of this came to light when at 3DM Colin Mill (Mr CSM) produced a test rig wherby you could control the tail blade pitch pushrod by hand as it was spinning. In his talk it was his opinion tail servo's are working close to there limits and that unfortunately it was to expensive for CSM tp produce a dedicated item to his spec. (this was aimed at standard size servos) but the above applies equally in miniture.

Colin suggested using longer blade bolts as it doesn't require a lot to assist the servo. The rig used a little electric motor to spin up the tails by pushing it against the tail shaft from the opposite side (rappie tail)..then push pull the rod to test

cheers Brian

[raptorheli2]

well guys i bit my own bullet. i'm not the proud owner of a fp2500 packs, little option left. i tried to fly today but was 25mph winds and we were trying to get a 600n flybarless rigged up so all the time was taken up on that.

the heli balances perfectly with these packs. i don't want to run these long term but will be a good stop gap until mike does the business.

cheers

[raptorheli2]

little update, i just spoke to mike to let him know these packs balance well and get leads for balancing, he MIGHT know tomorrow re the 2700mah ish cell delivery date. if thats the case my fp's will be sold without making a single flight.

cheers

[XH558]

Here's a question for you Trex aficionados...
Is the 500 ever going to be made in a kit that wont involve a motor/esc gyro etc as I have a very blinged up Robbe Eolo that has ...
a Hacker C40 9L - with a matching Hacker ESC and a Ubec + a decent HH Gyro and a good digital tail servo. Also some good FP 2500mah EVO20 11.1v Lipos.
I'm looking to use all the electrics and stuff from the Eolo in something else due to very tight budget.

So the next question will be if not a 500 then what other recent heli that's Eolo/Trex 500 size - as I can see the Trex 450 is actually smaller.

Eolo is 880 rotor diameter - 720 length and 190 tail rotor - carbon main and tail blades - belt drive tail upgrade - all alloy swash and head.
But she's tired and I need a new plaything to get me back into helis a bit