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Home✈️Aircraft🚁Helicoptere-AlignT-REX 450 › Pinion gear pitch
05-09-2013 04:26 AM  6 years ago
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Toadster25

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Iowa

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Pinion gear pitch
Does anyone know if one of these old pinion gears I have left over from my rc car days will fit on my trex. I'm thinking the rc cars use a standard pitch and guessing the trex uses something metric. The look like they will work but I don't know.

Also I'm running a 2900 kv motor on 3C battery, what pinion should I run with this set up. I am currently using an eleven tooth and the tail barely has enough power to hold doing full pitch and I think I'm just running too low head speed.

Sorry I know I could probably do a search but its late and I'm tired.
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05-09-2013 04:32 AM  6 years ago
AWittleWabbit

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O.C., CA

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I'm pretty sure it's .5 ModHeli-itis sufferer.
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05-09-2013 05:09 AM  6 years ago
Heli 770

rrProfessor

USA.

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The 450 is a mod 0.5, Only the 32 pitch should be used as a metric replacement. But, only for a Mod 0.8 The Mod 0.8 has a 31.75 pitch.
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05-09-2013 02:55 PM  6 years ago
jschenck

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La Vista, NE.

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Also I'm running a 2900 kv motor on 3C battery, what pinion should I run with this set up. I am currently using an eleven tooth and the tail barely has enough power to hold doing full pitch and I think I'm just running too low head speed.
I ran an 11T with a 3550kv motor for a long time, that would get me about 2700 RPM.

If I were running a 2900kv motor today, minimum I would try would be a 13T, probably a 14T or 15T. 11T is way too slow though. Assuming you are running a head that has thrust bearings in the main grips. If you are running the older head with no thrust bearings I'd keep the headspeed below 2800-2900. just my opinion.
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05-09-2013 08:00 PM  6 years ago
Toadster25

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Iowa

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I think it is too slow but when I tried to run it faster I would get a really bad vibration from the main rotor head so running slower worked but now I want to start flipping it and stuff but need better tail holing power and roll rates.

I went and bought new revolution carbon blades to replace the align blades that look like plastic but say carbon in them. These new blade may have just solved a lot if my problems. They seem more efficient and less vibration. Only hovered in front yard so far though.

It does have thrust bearings so I should be okay if I can find a larger pinion but from the sounds of it I shouldn't use my old rc car gears
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05-09-2013 08:08 PM  6 years ago
jschenck

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La Vista, NE.

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make sure there are no bent shafts - main shaft and spindle bend easily, especially on the older ones. Check tail shaft also. It shouldn't shake at higher headspeeds.

also check the balance of your main blades and tail blades. many I check are off, even new out of the package.

If you were flying the old Align "Fiber" blades, they absolutely suck. much better off with the Align "Pro" wood blades. At the headspeed you are flying at I'd suggest you get a set of the 325 or even 335 woods and try them out. They fly really well at 2700 RPM and a lot less stuff gets broken when you wreck compared to composite blades.
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05-09-2013 09:54 PM  6 years ago
Toadster25

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Iowa

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Yes I think they were old align fiber blades that look like plastic to me. I am thinking they are junk and were causing my some of my problem. I have new spindle and main shaft but I am a little worried about the head block being bent or at least not clamping down onto the main shaft straight. Have you ever seem a problem with that or that causing a vibration?
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05-09-2013 09:58 PM  6 years ago
jschenck

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La Vista, NE.

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yep, I've bent the main block on them before and it'll cause all kinds of shakes. If you can get it to wobble or move around on the mainshaft it's bad. A trick I've used to see if the head block or mainshaft is straight is to put a small screwdriver or something in the hole at the top of the block where the head button screws on then rotate it slowly. If there is a wobble it should show up that way.
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05-09-2013 11:11 PM  6 years ago
Toadster25

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Iowa

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When I spool up I can see it wobble but I didn't know if it was an imbalance causing it. I think I should probably get a new head.
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