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Old 02-17-2017, 01:48 PM   #1 (permalink)
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Default Trex 600 and Scorp 4035-450

Putting together my first scale project. Picked up my airframe, a Trex 600 pro dfc, it has the mod 1 112t main gear, a 12 and 13t pinion with it. I plan to put a 4 bladed head on.

I've just ordered an 11t pinion, along with the KDE adjustable motor mount. I'm looking now to the motor choice and if I'm working things out correctly I think the Scorpion 4035-450 will be a good choice. The other option I'm looking at is the Scorpion 4035-330.

Looking for some more experienced input, maybe there is other choices out there that would be good.
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Old 02-17-2017, 02:36 PM   #2 (permalink)
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If you are going to use a multi blade head you will have tail issues. I used the auto rotation gear and front tt gears from the 600 nitro to speed up the tail. Dominator 118t main gear, KDE adjustable. Motor mount and 10t pinion. I run the stock 600mx 510 kv motor w/4 blade head at 1500 rpm.
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Old 02-17-2017, 03:50 PM   #3 (permalink)
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Thanks for that. Are they a drop in fit or is there any modification needed?

Would that be these parts -

http://www.fast-lad.co.uk/store/prod...ducts_id=37172
http://www.fast-lad.co.uk/store/prod...ducts_id=26804
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Old 02-17-2017, 07:19 PM   #4 (permalink)
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If those are indeed the parts for the nitro then, yes.The holes for the torque tube transmission block in the frame will have to be elongated to adjust the gear mesh. KDE sells a kit. I read the instructions on the website and filed out the holes and used washers behind the screws instead of buying the fancy " bling " plates. It works perfect.
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Old 02-18-2017, 02:09 AM   #5 (permalink)
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RPM = kV x (cells x 3.7V) x 0.9 (efficiency) x pinion teeth / main gear teeth = RPM at 100% throttle towards the end of the flight.

So in your case with 12s & a 450kV motor,

RPM = 450 x 44.4V x 0.9 x 11T / 112T = 1766rpm

You don't mention what ESC you have. If it is a freewheeling model, you will be fine. If it is a CC Edge HV or similar, then the lowest you really want to go is around 90% for the governor - lower than this starts causing heat issues.

So 1766 x 0.9 = 1590rpm

IMO this is too fast for a 4 blade 600. I run my 600 Seahawk at 1350rpm, and it flies well.

With a 330kV motor, it is 1295rpm at 100%, which is too slow.

Something like a XNova 4035-400kV (much better than a Scorpion IMO) might be better;

RPM = 1570rpm at 100%, so 1350rpm would mean governing to 86%, which is a bit low, but if you live in a cooler climate, may be OK.

You can't drop to a 10T pinion ?

Another option is to go for a XNova 4030-350kV (which would have plenty of power for scale flying) and a larger pinion.

At 350kV and 12T pinion, RPM = 1423rpm, so 1350rpm would be governing to 95%, which is perfect.

I run a Xera (predecessor to XNova) 4030-470kV in my Seahawk, and it has never let me down. I run a Trex 700 164T Mod 0.7 main gear and 13T pinion.

FYI, my Seahawk has 4x 105mm tail blades and has plenty of tail authority, but with 2 blades, or 600 size tail blades, you may struggle.

Colin
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Old 02-18-2017, 04:14 AM   #6 (permalink)
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Thanks for the calculations.

I don't have the esc yet so that gives me some flexibility I guess. The 4035-450 is a good price so may give it a go.

I also had my main gear wrong, it's actually 118t which brings head speed down a bit more to between 1508 at 90% and 1676 at 100%, with an active freewheeling esc I can run it lower at about 80%. I run hobbywing on a few of my helis, so will probably go that route.

Will that work?
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Old 02-19-2017, 02:27 AM   #7 (permalink)
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No clue sorry - I have never used a HW ESC, or any other freewheeling ESC (like Kontroniks or YGE) - not even sure if HW has active freewheeling.

A very quick reveals that both Scorpion 4035-450kV and XNova 4030-350kV are around the US$250 mark, but maybe you are getting a better price ?

http://www.experiencerc.com/store/pr...ducts_id=19755

http://www.rc711.com/shop/scorpion-h...ss-p-6151.html

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Old 02-19-2017, 04:28 PM   #8 (permalink)
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Hobbywing calls it something different, can't remember what, but the platinum v4 esc's definitely have active freewheeling. They also have a really slow spool up rate up to 25 seconds which would be good for a scale project.

I think I'll get the motor, it's half the price i've seen the xnova for.
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Old 02-20-2017, 04:36 AM   #9 (permalink)
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Went for the Scorpion 4035-450 as it was 119, a great price. Picked up a 10t pinion too so all bases should be covered now.
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