Trex 600 Nitro to Helibug HB6-RCT7

[phillhague]

Anyone got one of these flying at present ? Have just built a Raptor 90 Thunderbird gasser and was thinking of building another gasser using my Trex 600 nitro as the donor model. So I'm just looking for info on what you think of the Helibug HB6-RCT7 in terms of weight and how it flies compared to the stock nitro version, also what motor may suit it best G240RC 4 bolt top end or G270RC. If you have the all up flying weight including fuel that would be useful. Was also thinking of going with the Helix OS 15 gasser but from looking at the posts, maybe that motor is not the most reliable engine to have in a heli.

[jimmymc2286]

I am putting one together now but don't have it flying yet. Wish I could help. I need to round up the servos for it yet. The ones I were going to use are now in my Raptor 30 gasser. Keep us up to date on what you decide to do.

[Calil]

I did. The 270RC engine is a lot of engine to the 600 I have a lot of engine to 4.7 kg.

I'm considering stretching it to 700 size. You should go with the 240, that's more than enough.

[rbort]

Otherwise its too heavy. If you have to use the smaller one, go with the 240 like Calil says, good advice as you don't need more than that.

But my preference is to stretch it so it will have a bigger disk and carry the weight better.

-=>Raja.

[Sowa]

How does a stretched 600 gasser compare in weight to a goblin 700 gasser?

[phillhague]

4.7 Kgs seems really heavy for a 600 aitframe. As for stretching to 700, does the 10mm mainshaft/bearings and 600 head/blade grips have the ability to cope with the larger rotor disc ?

[Azalin]

The best blade size for this conversion is 640mm. Longer than that the pinion block will fail eventually.

For 600 to 640 blades you don't need to change the rotor head. For 700's you need a 700 head which uses 10mm main shaft.

[Calil]

Hey Azalin

And the tail blades, 95?

I tough the 700 head uses 12 mm main shaft

[phillhague]

Originally Posted by Calil

Hey Azalin

And the tail blades, 95?

I tough the 700 head uses 12 mm main shaft

I think Azalin means that I would need to find a 700 head block to fit the 10mm mainshaft, maybe something like the RJX item they did a while back but there are probably other ones available elsewhere. Seems like too much messing about to me and maybe it's better just to leave the 600 as it is until OS get the gt15 motor sorted out.

[Azalin]

105 tails for longer than 600 mains. Maybe 620's and 95's will work together.

Yes, RJX made a 700 head that uses 10mm main shaft.

I used a 700 rotor head in my 600 in the past. Used 10mm ID and 1mm wall precision steel tube but I didn't like it.

[fastflyer20]

There is very little different in weight between a HB 600 and 700. My stretched HB 600 weighed the same as my 700.

You may want to look at 700 heli's using the Zenoah clutch, I am not a fan of the nito style clutch in a gasser.

[phillhague]

I have a brand new RJX 700 size headblock with the 10mm bore, just found while sorting some stuff from FBL projects from a couple of years ago. Trouble is there is no point in me doing the conversion on the 600 if it turns out as a 700 size heli, best leave it as it is ! 4.7 Kgs is too heavy for a 600 size heli that at present weighs in at 3.6Kgs with a full tank of fuel

[Calil]

Mine is flybar. Just weight it again, 5.0 kg

But it flies great, very easy in manouvers and engine at 50-60 % may be.

I like it a lot!

OS15hz? good luck mate!

[phillhague]

Originally Posted by Calil

Mine is flybar. Just weight it again, 5.0 kg

But it flies great, very easy in manouvers and engine at 50-60 % may be.

I like it a lot!

OS15hz? good luck mate!

Mine is flybar model at 3.6Kgs with fuel ! 5.0Kgs that's alot of extra weight you got some lead in there somewhere ? Yes OS 15 gasser, no chance I'm not going down that route sounds like they spend plenty of time in for repair and not much in the heli flying. My local heli shop were a bit puzzled when I asked them about buying one, gave me some strange looks and that sorta said it all for me.

[Calil]

I don't know why mine is so heavy. Really

It's a T-Rex Flybar 600 with the helibug and stock zenoah 270RC.

Not a problem flying since I only fly scale/sports. My thottle curve highest point is 60%, it's too much engine for it.

May be that's the reason of the weight? how much does the 240rc weights?

How much weights the others 600 conversions? Where is ALI from helibug? HELP ALI!

[phillhague]

Please don't forget mine is flybar Nitro model at 3.6Kgs with fuel.

Anyway had a look on Daves motors, spec weight for G240RC and G270RC is 2.07Kg - same for both engines. I assume that's with the stock Zenoah silencer and clutch, 50 size nitro with pipe but without clutch is in the region of 0.560Kg / 0.600 Kg. You have got approx 1.5Kg extra weight in the motor alone, stick on a RJX / Hobbyking pipe at 0.350Kg and the weight adds up. Trex 600 with that Zenoah motor is always going to be a fatty but if it suits your flying style that's all that matters.

[Mark Dean]

I have the kit with a Zenoah 290 swinging 600mm Edge blades. All up weight is 14lb. It flies great but the autos are a little fast due to the heavy disc load. The stretched 700 is a good flying machine, but the 600 is more like the nitro version of the bird. As everyone has stated, the 240 will be plenty. It really is a great little gasser.

Helibug Gasser (8 min 13 sec)

Mark

[phillhague]

Checked out the video ! it looks to be a great flying machine and weight does not appear to be a problem, thanks for the reply and info. Phill