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Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › T-Rex 700E or 800E
03-12-2014 07:55 PM  6 years ago
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Mnstorm07

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Manchester, CT

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T-Rex 700E or 800E
For my biggest heli, I've been debating over getting the 700 or 800. A buddy of mine let me fly his 700 and it was incredible obviously. But, its really not that much more for the 800. I definitely want a electric model as all my helis are.

Lot of vet pilots in here, what are your thoughts?
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03-12-2014 09:04 PM  6 years ago
unclejane

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santa fe, NM, USA

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Well I have both now, a trex 700E V1 (the old-school with the V1 FBL head) and an 800 pro DFC, which I just got a couple weeks ago.

If you can spring for the pro DFC version on either one, I would highly recommend it. It's a really well put together kit that's as strong an a brick outhouse. The parts count is low and it goes together easily.

I'm an FPV flier, so my experience with them is a little different than you line-of-sight pilots. But the main advantage of the 800 is going to be wind handling. I've flown my 800 in winds gusting over 20mph, even watching tumbleweeds running under the heli, but had very little problems hovering/landing/taking off. And that's at approx. 1000rpm headspeeds on one 6S batt. On 12s, it ought to handle a total hurricane....

The only disadvantage is fitting it in your vehicle and there doesn't seem to be a huge selection of 800-class rotor blades out there yet. Parts probably won't be a problem, since a lot of them are shared with the 700 DFC kit.

I went with the 800 because I want a lot of wind handling and stability for FPV. The 700 is still pretty stable but the 800 is just moreso....

LS
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03-12-2014 11:35 PM  6 years ago
Mnstorm07

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Manchester, CT

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Cool, thats what I was thinking.

I drive a Jeep Wrangler Rubicon Unlimited, plenty of room in the back for bigger heli's. I was more concerned about the benefits and i really so no reason not to get the 800 if you can afford it.

Basically right now, I only have a trex 450L domi that I fly in open fields, all my other heli's are small enough to fly in my backyard.

To be honest, right now...I'm having a blast with the new Trex 150! Lol, fragile as all hell, but really flies like a bigger heli. if you crash it, you will be replacing parts. But performance wise, it can easily rival a trex 250. Very fast, just not as stable as the 250 outside.

The 800 may be my upcoming winter project end of this year. As with all of us, this will be "my baby" so I want to take my time building/setting up.

Thanks for your input, always appreciated.
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03-13-2014 01:05 AM  6 years ago
Vaderluck

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Melbourne - Australia

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A big jump from 450 to 800.
I go from 450 to 600Nitro. A guy from our club said I will have a huge learning curve. I yet to find out. The only thing I know for sure is a crash costs me a lot more money !
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03-13-2014 02:06 AM  6 years ago
unclejane

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santa fe, NM, USA

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I built my 800 in about the time of a weekend. I got the kit on a thursday, I believe, and started on it after work. Before bed, I had the rotor head assembled and had begun on the frames. I did the maiden I believe that sunday.

So it won't take long to build. Since the DFC is direct to swash, the servo installation, which is usually the most grueling part of a heli build, goes pretty fast.

Since I'm FPV only, the view is the same no matter what I'm flying, so the 800 is a bit overkill. But it handles like a big machine which is what I like, especially with the hurricane winds we have here all the time. And it sounds really realistic on a single 6S batt...

I love my 2 700 sizes, but there's a noticable difference in stability with the 800 size.

I dont have any criticisms of the 800 yet, since nothing has really gone wrong with it yet - not enough flying time. There was only one gotcha during the build and it was minor (the 4mm female bullets for the ESC to motor connection are too small to fit onto the 10gauge wires coming out of the ESC).

But it flies great, and no problems so far out of the DFC head. But I fly at low HS's and don't do aeros yet...

LS
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03-13-2014 02:47 AM  6 years ago
Mnstorm07

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Manchester, CT

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That is very cool.

I've only flown my quadcopter FPV (Phantom 2), never tried it with a heli, and not sure I'd want to. Its challenging enough for me to let go when flying the quad - when you stunt fly heli's, you get VERY used to visibly seeing the machine, orientation, blades...etc. Would be very strange without that.

And I know it will be a big jump from a 450 to an 800. But, I have the 450L, very big 450 Lol. I see no need to get anything in between, mainly because I'll have to fly them at the field anyway...why not just go for it? I already have 7 heli's, the 800 will be 8. We'll see....
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03-13-2014 03:06 AM  6 years ago
unclejane

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santa fe, NM, USA

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I'm the only one I know of that's mentally deranged enough to fly a helicopter FPV 100% full time, spool up to spool down, so yeah I don't recommend it LOL. Not true, it's doable once you're comfortable on a multirotor in manual mode (I taught myself with a Phantom I), but there are some significant differences in the handling.

The 800 is like driving a giant floating truck or something. And in the hover and in the wind its great.

But even line of sight, the main thing you'll notice is just slower movements overall and more inertia. Especially movement with cyclic inputs is slower due to the bigger size and extra weight. It's not a big deal. Just don't get near the thing when it's spooling up lol.

I was the same way, I started on a trex 450 (which I still have) and saw no reason not to go to a 700 size when I needed something bigger. If the 800 had been out at the time, I'd probably have gone to it directly also...

LS
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03-13-2014 03:30 AM  6 years ago
Slowpoke

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Dublin, OH

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I have a TRex 800E Trekker, not the DFC model. I'm running 12s with VBar. I also have a 700 Nitro. The 800 is a little bigger. Super stable. Easy to see in the air. The sound of those 800mm blades is awesome.
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03-13-2014 03:22 PM  6 years ago
unclejane

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santa fe, NM, USA

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I thought about the trekker also, by the way. It looks similar in a lot of ways to my V1 700E, which is a good kit. It's got a bellcrank arrangement for the cyclic servos, which is really strong and puts the servos closer to the front. Helps CG and you have less servo wires strung around the frames.

I got the Pro mainly because it's going to be a little easier to build and the electronics/power system is upgraded a little bit. Not that that equipment wouldn't have worked for my purpose tho. I also wanted the black gears. So for the extra money it was worth it.

I've heard guys complain about the OWB being weak on the trekker, but I think it's the same part number as what's on the Pro (I'll check and see). The way I run my machines I'm far below the level of abuse that would tear it up, so to me it's 6 of one 1/2 dozen of the other on the OWB...

LS
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03-14-2014 01:21 AM  6 years ago
Mnstorm07

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Manchester, CT

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Ok, I'm now sure about it, I'll get the 800 when I'm ready. Thanks again guys for the input. Always apprecaited.
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03-14-2014 02:04 AM  6 years ago
unclejane

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santa fe, NM, USA

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When you do get the scratch together and order it.... I got mine from Helidirect, who offer it as a combo with a pair of batts. Mine came with 2 of the newer 5200mah Align 6S (new 50C versions).

The combo now has pulse batts and is even cheaper:

http://www.helidirect.com/align-t-r...ies-p-27846.hdx

Highly recommend helidirect, they're a class operation.

LS
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03-14-2014 02:39 AM  6 years ago
Mnstorm07

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Manchester, CT

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Wow, that is a good deal. By far the best price I've seen so far. I've been seeing around $1900-$2200, and that is without the batteries.

THanks for the tip. I usually order parts from the Align T-Rex Store, Ebay or Amains whichever has the best price.

Kinda makes me want to order one right now :P Would be hard to hide this one from the wife! Lol...
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03-14-2014 04:52 AM  6 years ago
jschenck

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La Vista, NE.

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I've been flying a Trekker for over a year now all box stock including the 3GX. I will say when you really crank on the sticks @1950 RPM it'll get aggressive. Maybe not as super agile as a 700DFC pro but it'll move even with the 750MX motor. The 810 blades were a bit much for throwing it around, great for cruising and sport aerobatics though and the auto's are 2nd to none. The 780 blades let it get more agile and don't load it up as much but you feel it in the auto's.

For sport flying I've wanted to reduce it to 8S - I've flown it around at 1500 RPM and it still has plenty of pep to it. I don't like this though as it's too low of a throttle setting for the ESC, I'm afraid I'm going to smoke the ESC on 12S throttled that low. I've seen vid's of guys running these on 6S, that is a very low headspeed, say 1000RPM. I'd bet 8S would be a good compromise.

I've enjoyed my Trekker. I may even stretch my ALeeS Rush and put some 780 blades on it.
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03-14-2014 03:29 PM  6 years ago
unclejane

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santa fe, NM, USA

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That's one of the reasons I fly my HV setups (my 700's and the 800) on 6S full-time. They're so hideously overpowered on 12S, you can cut that in half and still have a super realistic flying helicopter.

Plus you lose about 1.5lbs of weight and the ESC essentially runs at wide-open throttle all the time, which is the best thing for it.

The motor on my 800 is capable of dissipating 5100W continuous, which is almost 7hp. 7hp is just crazy in a model a little over 10lbs.... So on 6S, trust me it still has plenty of poop.

It's expensive to experiment so I've not tried a 7S or 8S on any of my 700's or the 800. With the 6S batts I've already got, tho, the performance is ideal. Nice and quiet and not as dangerous, no shaking, no burning things up or wearing things out...

LS
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03-14-2014 08:57 PM  6 years ago
Slowpoke

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Dublin, OH

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unclejane,

Do you change the gearing when running 6s? What headspeed are you getting?

If all you have to do is just leave out one battery pack, I might give it a try, as all I do is sport flying..
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03-14-2014 09:12 PM  6 years ago
unclejane

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santa fe, NM, USA

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No, you don't change anything at all. Just pull a pack, check the CG and go fly. The ESC will just run at full throttle all the time for the whole flight.

I'm getting somewhere around 1100 rpm by a rough guess on my trex's and around 1200 on the Whip E. It will decay a little bit throughout the flight as the pack voltage drops because you're at wide open throttle. There's basically no governor to speak of because the ESC is pegged. So you'll also hear it drag a little if you use a lot of collective, etc.

But I love running them this way. very very realistic and nothing is shredding apart or stripping or burning up...

LS
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