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Home✈️Aircraft🚁HelicopterThunder TigerRAPTOR 90 › Trex700 rotorhead on Raptor 90
12-26-2010 03:27 PM  9 years ago
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trillian

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London, UK

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Trex700 rotorhead on Raptor 90
Has anyone put a Trex 700 rotorhead (with flybar) on a Raptor 60/90?

I asked this on another forum a while back and got no answer. I would be very surprised if no one has tried it.

You may ask why? I have a Raptor and due to a mechanical mishap the original rotorhead was severely damaged. I happen to have a black Trex 700 head I bought for another project and it fits straight on. I am still working on other things so I have not gone beyond just fitting the head on but if anyone has done this already then anything learned from the experience could be helpful.
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12-26-2010 04:04 PM  9 years ago
unochen

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12-26-2010 04:10 PM  9 years ago
trillian

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Hi Unochen,

Cool!

Did you use the Raptor main shaft? The 700 shaft has additional threaded holes for the two screws that go in above the Jesus bolt.

It fits on the Raptor main shaft but I'd have to either just ignore those two bolt holes (most heads don't have them anyway) or drill a hole in the Raptor shaft.

Did you have to do any other mods?

By the way, what blades are those ? :-)

Many thanks!
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12-26-2010 05:43 PM  9 years ago
c54fun

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Trillian,
I use a 700e flybarless head on my Raptor 90. Stock Raptor 90 shaft. I use the lower bolt hole on the Trex head. I do not use the upper hole. You could drill it if you wanted.

I think the flybared head bolts on the same way as the flybarless.
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12-27-2010 06:41 PM  9 years ago
trillian

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Hi C54fun,

Yeah, when I realised the upper holes are not threaded my first thought is just to ignore them. Most main hubs just fit snugly on the shaft and only have the one 'Jesus bolt'.

There seems to be plenty of overlap and perhaps the Trex shaft is ever so slightly longer above the holes but it should be fine on the Raptor shaft.

Mine does have a little slack and can rock ever so slightly if the lower bolt is loose but maybe that's no big deal (or a wee bit of tape on the shaft would solve that as well perhaps)

In the pic above though I can see a profile of what looks like a bolt in the upper holes so either he drilled into the Raptor shaft or modded a Trex shaft.
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12-27-2010 07:51 PM  9 years ago
payne1967

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why not just tap the upper hole and fit some grubscrews to stop the head rocking
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12-28-2010 02:12 AM  9 years ago
c54fun

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Good idea payne.

Just checked mine and there is plenty of material to tap.
Mine has no play at all with just the lower bolt.
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12-28-2010 11:00 AM  9 years ago
unochen

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Yes,I used the Raptor main shaft to modify.
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03-20-2011 01:38 PM  8 years ago
trillian

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Finally flew it
Now that the weather has been warming up here I finally got round to flying the Raptor with the Trex 700 rotorhead.

I have to say, my flights were very brief due to engine tuning issues (basically just not knowing where to set the mid needle as it is an OS 91 SX C spec with a pump and my manual shows a carb that does not have a needle on the return line).

So I only just flew some small circuits but it feels pretty good so far, the cyclic response seems quite fast and it hovers hands off.
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03-20-2011 11:16 PM  8 years ago
RaptorRob

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trillian

just surf the engines fourm on here for the needle settings thats how i got close on mine if i find the thread again i will post it

i know altitude will affect the settings but it got me close sometimes the needles can be so far off you just chase them its just a good starting point

i ran a t rex 600 head on my rappy 50 and i liked it very much it was rock solid and the parts are cheap basicly if everything fits and you get enough pitch run it

fyi if your running a gov your engine is running off the high needle the mid needle dosnt come into play that much once i set mine i never touch it just adj the high needle when it calles for it
no babe i swear i sold my other heli to buy this one :)
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03-20-2011 11:28 PM  8 years ago
payne1967

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uk

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sheryl
you know my reply
aka
electricsceadu
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03-20-2011 11:36 PM  8 years ago
trillian

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Hi RaptorRob,

Yeah I have searched everywhere and it seems having the extra needle on a pumped 91SX is very rare, every thread I have followed to shed any light on it has been a dead end. Plenty of info on the non pumped version and plenty of info on the pumped version without the mid needle. But not to worry, I will get it sorted :-)

I'm not running a gov on it at the moment.

Hi Dave, well, ya just never know so I thought it wouldn't hurt to try good old RR. But when I get some time I'll have a look at maybe changing out that banjo bolt thingy. I want to take the path of least resistance / quickest solution rather than burning lots of fuel fiddling with it at random.
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03-21-2011 12:06 AM  8 years ago
RaptorRob

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what is it doing?? rich? lean? and were in the throttle curve is it doing it
not running a gov can be challenging your throttle curve has to mach your pitch curve perfect and alot of people forget to tell you it has to match your flying style also bogging the motor flying hard will make the motor run richer so leaner settings are needed

head speed is also a factor you need to match your head speed to your gear ratio so that the motor is running at its optimal range

me personaly i think the mid needle is useless lol i use the low needle for idle and as soon as i take off i go into idle up 1 witch i run about 1650 1700 head speed and that is in the high needle range
(im no expert)
let us know what shes doing mabe we can shed some light on the sbjt
no babe i swear i sold my other heli to buy this one :)
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03-21-2011 01:12 AM  8 years ago
trillian

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London, UK

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Hi Raptor Rob,

I have a spare OS91SX just like it only without the extra needle where the return line is, so the path of least resistance is probably to swap out the fitting and run it as just the single high needle, then it's easy really.

I am very aware of setting my pitch curves / throttle curves, etc. etc. I have lots of helis and have been tuning engines for a couple years now. But this is the first one with a pump and that does change things a bit :-)

I'll figure it out, I have a post in the engine section here in the hope maybe someone had first-hand experience with this particular engine and carb.

I don't want to take this thread too off topic as it is intended to be about the 700 head on the Raptor.
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