View Full Version : Trex 500 nitro??????

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02-08-2009, 05:28 PM
Check this out.

02-08-2009, 06:06 PM
That was cool, seems like he have modified the frame a bit to get the tank to fit.
Maybe someone have more detailed information about the mod. :noteworthy

/ Stolpe

Redfire SVT
02-08-2009, 06:45 PM
Nice :smokin:

02-08-2009, 09:01 PM
Sweet! I want one! Looks like it had a pull start? is that a car motor?

02-08-2009, 09:42 PM
Cool! Anyone have closeups on the setup?

02-08-2009, 09:45 PM
Sweet love to see some picture of the setup. Look like it's balanced pretty good too. Fun is a T500 smoking .:smokin:

02-09-2009, 12:32 AM
That looks like the best mod Ive seen yet for a 500.

02-09-2009, 04:42 AM
I like the fact that it's a pull start.

02-09-2009, 08:26 AM
I want one , i dont care if it dosent have the torque of a 90 .

i want , i want


02-09-2009, 04:59 PM
What do you think then its an os .18 engine pull or top start, solid main shaft, drive is 12-1 head speed up to 2666, i love flying my 500 ep just get fed up of the batteries only lasting 9-10mins so i made a nitro one as well, can get upto 15mins per tank and it actually weighs less too and if ive worked it out right will have more power to weight than my 6c 2800 powered rex 500 but will have to see

02-09-2009, 05:05 PM
Thanks for posting

No how about taking the cover off..... LOL so we can marvel at its working..

i dont know if you realise this , but being the first is awesome , now watch them pop up around the place .

lol' thanks for your hard work ...


02-09-2009, 06:50 PM
Yeah it dose feel good mate only been in the hobby just about a year too

02-09-2009, 06:54 PM
Very cool! Love it when it's done different. :thumbup:

Any vids of your 500"N"SP doing some loops or forward flight?

02-09-2009, 06:55 PM
Good job !

02-09-2009, 06:57 PM
as soon as the weather get better there will be, will try ang get out at the weekend but lately the weather over here is crap:thumbdown:

02-09-2009, 07:14 PM
Yeah it dose feel good mate only been in the hobby just about a year too

02-10-2009, 06:10 AM
I'd be interested to hear the full details of this, such as how you went about making the frames, what pinion/main gear/fan/shroud/fuel tank etc you have used. And also how it flies! When this idea has come up before, a lot of people have suggested that it would end up being too heavy and underpowered.

02-10-2009, 06:25 AM
That looks awsome cant wait to see that bad boy flyin:)

02-10-2009, 11:17 AM
you should make a page explaining what you did to convert the 500 over to nitro

i have acess to an OS 18TZ-Tx that i could use:YeaBaby:

02-10-2009, 01:35 PM
Yeah it dose feel good mate only been in the hobby just about a year too

The conversion build should be a sticky here in the forum. That is sick mate..:noteworthy:thumbup:

02-10-2009, 01:49 PM
The conversion build should be a sticky here in the forum. That is sick mate..:noteworthy:thumbup:

+1 :lolol

02-11-2009, 06:52 AM
Yes come on Rex500nitro -spill the beans mate!

02-11-2009, 08:15 AM
+ 1 awesome job mate
LOOKS like a factory one !!

nutto !!

Jason .

p,s, thanks for posting

02-11-2009, 09:48 AM
Hi, by chance, I was just toying with this conversion myself.

I'm a rank beginner so any comment/suggestions on my plan would be much appreciated. Just tried removing my trainig gear this week.

By coincidence(?) the frame spacing of the Trex500 is 39mm - exactly the flange width of most 1/10 car engines from a .12 up to and including a .18. The .21 and larger sizes are bigger. (Airplane engines are also sized differently, so even a .15 plane engine won't fit.)

So I crunched some numbers based on a 14T pinion (to be scrounged from a car) and the stock rex500 144T main gear.

I'm guessing the OS .18 CV develops max power at about 28000 rpm (based on manufacturer's power ratings). (higher for the top of the line TZ version)

Mutilating the electric formula and assuming an efficiency of 80% (should be higher)

Estimated headspeed = (Motor kv * Battery Voltage /(Main Gear /Teeth of Pinion)) * Efficiency Rate

= 2800/(144/14) x .80
= 2177 rpm

That's flyable, no? Actually, I think the efficiency is a little higher cuz the efficiency losses have already been factored in so I need not do so again.

So I think I’ve found my plan. Just need:-

1. 1/10 engine mount for cars (either 2 piece or 1 piece with integrated heatsink…)
2. 1/10 flywheel
3. 3 shoe clutch assembly
4. 1/10 clutch bell with 14T pinion…

Would add a 1/10 header and pipe, or just the header and make my own mousse can muffler (airplane style). Should probably also be thinking about a fan and some ducting, but these will likely have to be custom modified. Probably not required to fly, but something to fiddle with down the road….

Does all that sound intelligible and reasonable? Sorry, heli newbie here.

02-11-2009, 04:02 PM
Hi to start off with mate you would be luckey to find a car pinion to mesh with the 500 main gear, a car clutch wouldn't last 5mins, thats if your luckey they wont handle it, you need a propper heli type all makes have the same type and they r not a shoe type
cooling is a must in a heli so will need a fan, and needs to direct air over the head so a fan in a shroud like i used would be best, i looked into using a top mount fan but after going to all this trubble i didn't want the risk of cooking my engine every 5 mins your spot on with engine i used the cv as it has side exit, u can use the tz but thet will be more work as rear exit, i would aim for arount 2600 rpm head speed,12-1 gearing to use the power band of the cv @28000