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HelicopterAlignOther › Have you shrunk your 600 to a 550?
04-06-2011 05:32 AM  6 years agoPost 1
McKrackin

rrProfessor

Lucasville,Ohio

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It is a bolt on mod for stretching a Trex 550 to a 600.
You just put on some 600mm blades and a Trex 600 tail boom and torque tube.

So it stands to reason you could put 550mm blades and a Trex 550 tail boom and torque tube on a Trex 600.

My question is this...

How about a Trex 550 Nitro?
Can I change the gearing to get a higher head speed?
Would 2200 RPM be enough with 550mm blades?

I literally never use the word literally right.

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04-06-2011 05:39 AM  6 years agoPost 2
Eco8gator

rrElite Veteran

Palm Beach, FL

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Just change the blades...

I tried putting a TT and boom on the 600 and the heli just looked silly. The weight savings is not worth doing the extra work.

BTW, I switched back to 600mm on my 600. I just felt it flew better esp since the airframe is a bit heavier than the 500 frame.

C

Xera Motors
ProBar
Minicopter
Thunder Power

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04-06-2011 05:47 AM  6 years agoPost 3
McKrackin

rrProfessor

Lucasville,Ohio

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I wouldn't think it would look too odd.
Maybe just because it looked so different to what you're used to.

The skids,rotor head,tail boom and tail rotor are all interchangeable so it should look pretty natural.

Head speed is the only real concern for me.
I want a fairly fast heli to fly in a slightly confined space and I have no interest in electric helis whatsoever.

I literally never use the word literally right.

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04-06-2011 09:50 AM  6 years agoPost 4
swat310

rrApprentice

Mesa Arizona

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Why would any one wanna shrink a heli? Bigger is better! I understand 550s are cool I have one and love it. But why would you wanna make one smaller? bigger blades = smoother flying and more control. Plus its much easier to see when they get far away

Trex 450pro V-bar, 700E V-bar 550 V-bar 600N & 250

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04-06-2011 01:18 PM  6 years agoPost 5
Eco8gator

rrElite Veteran

Palm Beach, FL

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I actually did the modification.

The heli proportions are off and it looks plain silly.

If you want to waste some bucks to save like 2 g of weight go for it because there is absolutely no good reason to put a shorter boom on the heli

If you want 550 blades just put them on the heli. If you want 30 size efficiency then just put an OS37 in the heli with a muffler.

C

Xera Motors
ProBar
Minicopter
Thunder Power

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04-06-2011 02:05 PM  6 years agoPost 6
MartyH

rrProfessor

USA

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I think you're going the wrong direction. Bigger flies better.

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04-06-2011 02:15 PM  6 years agoPost 7
DougCart

rrNovice

Port Charlotte, FL

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Yeah,bigger is way easier to fly.You gotta be a pro to fly a smaller heli equally as well.

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04-06-2011 04:46 PM  6 years agoPost 8
McKrackin

rrProfessor

Lucasville,Ohio

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"It looks silly" is not the answer I'm looking for.
How did it perform?

Why? I said it clear enough. I want a slightly smaller heli for some confined space flying. NO ELECTRIC.

I know bigger is better.
The Trex 600 I want to mod is sitting right beside my Trex 700.

I also would like to see for myself how a 30 size heli performs with a good 50 size engine.

Obviously there's no information on the subject worth reading and the only people who know can only comment to the silly appearance.

I may just have a go at it myself and might even share its performance issues or pluses.

I literally never use the word literally right.

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04-06-2011 04:54 PM  6 years agoPost 9
McKrackin

rrProfessor

Lucasville,Ohio

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I think you're going the wrong direction. Bigger flies better.
Yeah,bigger is way easier to fly.You gotta be a pro to fly a smaller heli equally as well.
Why would any one wanna shrink a heli? Bigger is better!
Why do people even post comments like that?
I'm only interested in performance opinions.

Have you done it? yes or no?
If you have,how did it do?

How did it look or what size heli do you like....Not interested.

Sorry,but I get tired of people pushing their opinions off on every topic.
Your opinions here are 100% off topic.

I literally never use the word literally right.

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04-06-2011 04:59 PM  6 years agoPost 10
Thatlumox

rrApprentice

NY

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Not exactly what you are asking for, but...
I did knock my Raptor 50 Titan back to a 30 size with the 50 motor, pipe and gear ratio and I have to say it flies damn good. Better than it did as a 50 size actually.

"I'm a dirt torpedo!"

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04-06-2011 05:05 PM  6 years agoPost 11
McKrackin

rrProfessor

Lucasville,Ohio

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Thank you Thatlumox!

Not exactly what I was looking for but completely on topic.
So you reduced a 50 to a 30 and kept the 50 power plant and it worked well.

Size is all I'm concerned with.
I want a nitro heli with good power that I can tumble around the yard with.

I don't want to spend another couple grand to find out if I like it but I might risk a couple hundred.

I literally never use the word literally right.

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04-06-2011 05:12 PM  6 years agoPost 12
Eco8gator

rrElite Veteran

Palm Beach, FL

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You asked and I told you the result of doing so on my T600...looked stupid, felt heavier but flew pretty much the same.

The difference in length between the 550 and 600 is very minor...just enough to clear the extra 50mm which is around 2 inches(we are talking a few grams in weight savings). If you think 2 inches will be the difference between you flying in confined spaces and not your mistaken

Oh and flying in your yard with a 30 sized heli or heck even a TREX 500 is not the best idea.

If you want a yard beater the Blade MCPx is pretty cheap and definitlly does the job.

C

Xera Motors
ProBar
Minicopter
Thunder Power

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04-06-2011 05:37 PM  6 years agoPost 13
McKrackin

rrProfessor

Lucasville,Ohio

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I have a big yard.lol...Half a day mowing with two zero turns.

I fly the 700 here but it would be nice to have something that turns a little quicker.

Eco..you never commented on performance.
You said it looked silly and you changed it back.
And I was really not talking to you but rather the guys that say bigger is better...Don't do it....easier to see....yadda yadda...

I appreciate your responses since you have tried it.

I literally never use the word literally right.

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04-06-2011 06:27 PM  6 years agoPost 14
jschenck

rrProfessor

La Vista, NE.

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If you can get the gearing right it'd probably perform like a 550e.

Let see, 18000 RPM = typical 50-55 size nitro
18000/7.5 = 2400

so if you can find a way to get a 7.5 gear ratio in there and run 2400-2500 RPM it'd probably run great as long as the engine can pull 550mm blades at that gear ratio.

I don't see any reason to put a shorter boom on there, even on the Raptor. The small weight savings wouldn't be worth the cost IMO.

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04-06-2011 07:52 PM  6 years agoPost 15
3dwanabe

rrVeteran

Huntersville, NC

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I put 550mm V-Blades on my 600N a few years ago just to see what would happen. The headspeed was cranked from 2000 to 2300 on the gov and maxed out the collective pitch to +/-14 degrees. Roll and flip rate was slightly faster and the collective punch was about the same. The blades were soon changed back to 600mm because the tank would run dry after just 6 minutes(high headspeed)and autorotation performance sucked.

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04-06-2011 08:34 PM  6 years agoPost 16
McKrackin

rrProfessor

Lucasville,Ohio

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Thanks guys.
If I get the gearing right,fuel should last a tad longer.
I can see how stock gears and short blades would rev up and burn some extra fuel but I rarely fly longer than 4-5 minutes anyway.

I literally never use the word literally right.

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04-06-2011 08:48 PM  6 years agoPost 17
Shawn Behrens

rrApprentice

DEEP IN THE BOG

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Infiniti hobby has a conversion to put an os91 in a trex 600N. This kit provides two other pinion gear (clutch bell gear in this case) options, I believe a 21 and a 22 (vs 20 stock if memory serves me). The larger 22 pinion will help but still not ideal. I thought about doing this awhile back but deemed it was not worth the time due to the fact that the cg will be jacked, and you won't lose enough weight imo for it to be truly fun. If someone made a 24 tooth pinion and cut some frames without bellcranks (to save weight) and move the mechanics around abit this would be an awesome size machine. Just think os55 geared correctly swinging 520mm blades at about 6 lbs it would be a seriosly fun little machine. I am actually blown away nobody has done it yet.

shawn

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04-07-2011 12:34 AM  6 years agoPost 18
rspiegel

rrVeteran

Austin,TX South Buda

My Posts: All  Forum  Topic

r50

I had a R50 with non hyper os50. I ran 550 wide cords. it was great ran the head at 2k. it was nice. very nice setup. it would flip and rolled nice. I put 600 on it to try and went back to 550s. just liked how quick it would flip. ALso crash cost was lower.

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04-14-2011 03:07 AM  6 years agoPost 19
ccieslin

rrNovice

Portland, OR

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Infiniti hobby has a conversion to put an os91 in a trex 600N.
Where on the site is this conversion I'm pulling my hair out to see it. Help please?

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04-14-2011 03:53 AM  6 years agoPost 20
Shawn Behrens

rrApprentice

DEEP IN THE BOG

My Posts: All  Forum  Topic

here's link to conversion kit, ( http://www.infinity-hobby.com/main/...roducts_id=2906 )the parts used to be sold separately too. Looks like a 23 tooth pinion is what comes with the conversion so the gearing is actually a little better than what I thought.

shawn

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