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T-REX 450 › Which head type????
04-16-2018 03:54 AM  5 months agoPost 1
UKhelinoob

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Michigan USA

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Guys I just bought this Nitro conversion for a T-Rex 450, so far I have ordered a complete torque tube boom assy and other parts that are needed for this heli (It's a project for me to do).. But I'm at a loss whether to go with a flybar head or FBL one.. Please help ( I hope that I don't sound stupid).. You see I've never flown a FBL heli before..

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04-16-2018 05:13 AM  5 months agoPost 2
rcflyerheli

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Granbury, TX USA

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You will still see an occasional flybar head, but by and large, the world has gone FBL. Seeing your photos, I really hope there is some upper mounting points for the engine mount; otherwise I would say you are going to get a lot of vibration from the engine, maybe to the point of a FBL unit not being able to work.

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04-16-2018 07:16 AM  5 months agoPost 3
ticedoff8

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Morgan Hill, CA. USA

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I would use a flybar head to begin with.
Keep it simple and get the thing sorted out before you complicate it with an FBL gyro.

But, I think a simple tailrotor gyro may be overwhelmed by the vibrations too.

You may have a "white whale" there. The mythical beast.
The legendary 450 nitro.

I have so many questions

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04-16-2018 02:00 PM  5 months agoPost 4
Richardmid1

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Leeds, England

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Throw it in the bin or TRY sell it on. Nitro's are great and I prefer them but anything smaller than a 550 needs to be electric. If flight time is your concern then dialing an electric down to give the same performance as that nitro will probably give you MORE flight time and so so SO much less head aches! Sorry.

60% of the time, it works every time!

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04-16-2018 02:20 PM  5 months agoPost 5
BeltFedBrowning

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Kansas City

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What size engine is that? That is a neat project. I would go flybar initially till you get the airframe figured out. I would have gone with a belt tail to cut down on vibration.

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04-16-2018 09:44 PM  5 months agoPost 6
UKhelinoob

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Michigan USA

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Guys I gone with Flybar head for now, as for the vibration..I never thought of that, so I'll ask the guy about that, as he made the conversion.. Oh the engine is a new .18 Toki... All parts to complete the build are on order.

And here's the HPI nitro truck starter that I modded. I changed the feeble 550 motor for a $80 high torque one (It's a ball-raced one). and I replaced the 16 AWG wire to 14 AWG and since the motor can run up to 12 volts. I can use a 7.2v HiMH (4600 mAH) for small nitros and a 11.1v Lipo for the large nitros (4000 mAH).. But getting the thick Lipo battey wires into the tamia connector was very hard, cos the wires are so thick (Used Vaseline to do it).. The pistal starter is nice and light, and Comfortable in your hand, and has a built in clutch in case the engine locks up.. It' a lot better that the heavy drill ones that people use ..

I'll let you know how it goes with this build.....

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04-16-2018 10:25 PM  5 months agoPost 7
UKhelinoob

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Michigan USA

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Guys I had a word with the guy and he said that making upper engine supports won't be a problem. You see he has a small machine shop, and he's done other heli conversions too.. Also I ordered a belt driven tail unit too..

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04-16-2018 10:49 PM  5 months agoPost 8
BeltFedBrowning

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Kansas City

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Lots of pictures with the updates, please. That is unique enough to warrant its own build thread

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04-17-2018 01:37 PM  5 months agoPost 9
UKhelinoob

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Michigan USA

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Ok will do...But lucky for me he hadn't shipped it, so he can make the upper supports that will be needed, as for that fuel tank that's in it.. I don't like it, so I get another one and it's be the other way round...

Oh, my heli collection is (2) 450 E-Razor's and that nitro 450 which will really be a T-Rex 450..

Please don't laugh.. But this is my training heli (Better than a sim)..I have changed the 2 motors for more powerful ones, and there's one servo on the wash-plate too (No motor on the tail). But to my surprise, is that the radio is 2.4Gz (100 meter range) and I have the wireless camera for it too (Transmitter has a button to turn the camera on for FPV.. Also it'll fly for 20 minutes on a fully charged lipo...

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04-18-2018 07:35 PM  5 months agoPost 10
UKhelinoob

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Michigan USA

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Well guys it came in the post today, and what a bargain I got..Inside the package was 3 (New) spare engines, 6 blade rotor head, and a muffler too.. With a note saying that he's giving up making these conversions (I bet that he can't make money doing it)..That's why he gave me the other engines)

Anyway looking at it.. The clutch drives 2 plasic gears which drives a small one way bearing shaft (In a bearing mount), and there's the electric motor pinon gear on top of the shaft which drives the main gear.. I must say a nice design.

However the clutch bell is rubbing on one of the hex head screws, and even though the engine mount is screwed down by four screws (M2x5mm).. You can still move it back and fourth, so I'll remove the engine and mount to see why the engine is not right in the middle of the mount (I'll be able to fix that, as its 2 pieces), and the mount sure does need supporting at the top (You are right about that), so I have a aluminum plate and will cut out 2 braces to solve that problem.. But for just $112 shipped (even with the minor problems), I came out a winner eh??

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04-18-2018 07:53 PM  5 months agoPost 11
BeltFedBrowning

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Kansas City

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If he had tried to market these 10 years ago, it may have been a different story.

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04-18-2018 08:30 PM  5 months agoPost 12
UKhelinoob

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Michigan USA

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Yep your right (Poor guy). Oh, anyone know where I can get the 6mm hex adapter from, as I don't know what the one is on the engine..

Oh, as for the frame I'm going to dump it and go for a carbon fiber one..

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04-19-2018 01:40 AM  5 months agoPost 13
JuanRodriguez

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The Villages, Florida

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UKhelinoob
But for just $112 shipped (even with the minor problems), I came out a winner eh??
Are you trying to convince yourself ??

Please let us know if you get this flying......

Been there, done that and old enough to know better.....

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04-19-2018 01:48 AM  5 months agoPost 14
UKhelinoob

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Michigan USA

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Yep I consider it great buy, and I'll do pics during the build..

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04-19-2018 01:57 AM  5 months agoPost 15
JuanRodriguez

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The Villages, Florida

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UKhelinoob
Yep I consider it great buy, and I'll do pics during the build..
And a video of it flying , right ?? Looking forward to it.... good luck !

Been there, done that and old enough to know better.....

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04-26-2018 08:55 PM  4 months agoPost 16
UKhelinoob

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Michigan USA

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Guys I need some help at getting this .15 Toki started when I completed building the heli... I have fitted a hex adapter to the engine shaft.. But I need some sort of small starter that takes a one-way hex wand.. Any idea's Please.... Oh Also I'm trying to get some spare gears for this custom nitro 450, but the guy said that he can't remember or he made them himself... But I don't think that he made them, as I do know that the plastic has to be pressed inside a mold, so the plastic ends up being very hard.. If not they will wear out fast, as for other gear.. He did make the aluminum block for it and the shaft that it spins on (It meshes with the smaller gear then up to the main gear)..Which has the normal motor gear (Brass).. For the main gear I'll use a Align slant teeth one....

Any idea's where I can get them from. Plus My plan is to use a Align 450L torque tube assembly and the main/Tail blades too (Cos they are longer).. I'll do a build thread for this project, and the first thing that I've done is drilled the holes in the bottom carbon fiber frames for that gear block (Pictured).. Plus cut out the top braces for better support to the engine mounts....

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04-27-2018 11:41 AM  4 months agoPost 17
Richardmid1

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Leeds, England

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See my first reply above!!

Seriously though you could use a standard one way starter wand and grind the hex down to suit. The gear looks like it is from another heli but im not sure which, maybe someone else will recognise it. Maybe you could modify the drive train slightly to use more upto date/common parts?

60% of the time, it works every time!

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04-27-2018 01:48 PM  4 months agoPost 18
UKhelinoob

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Michigan USA

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Richardmid1
ee my first reply above!!

Seriously though you could use a standard one way starter wand and grind the hex down to suit. The gear looks like it is from another heli but im not sure which, maybe someone else will recognize it. Maybe you could modify the drive train slightly to use more upto date/common parts?
I know what your saying.. But I'll continue building this heli, as for the drive train.. Anyone recognize the gears please... One has 19 teeth, and the other has 27 teeth. Also, they both look like they are from the same manufacture because they both use a pin that goes through the shaft (Gears have a pin slot)...

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05-11-2018 08:21 PM  4 months agoPost 19
UKhelinoob

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Michigan USA

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Guy's I think that I'll give up on completing this Nitro heli.. Because the fuel tank that came with it, is only 1oz, and you can't fit a bigger one into the frame, so with such a small tank. How long will the engine run for 2 Minutes or less LOL...

Shame though.. Because the 6mm hex start adapters (2 of them) arrived for the Toki nitro engine (For the back-plate), and I made the upper support braces for the engine mounting plates..Plus I was planning on fitting T-Rex 450L boom, main blades, and with a fly bar rotor head too..

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