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HomeAircraftHelicopterHelicopter Main Discussion › How critical is blade speed, Do I need an optical RPM sensor ? Nitro Heli
01-19-2015 12:13 PM  3 years agoPost 1
adamrs80

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San Antonio, TX

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I'm just about finished setting up my new Hirobo Shuttle Plus 2+ and I installed an OS. 37 SX-H in it. It's designed for the old OS.32. The manual says to limit blade speed to 2000 rpm.

I had a Shuttle Challenge years ago and a JR venture as well, and I never thought about blade speed.

I have the stock wood blades. Do I have to worry about blade speed because I'm using a more powerful engine, or does the gear ratio limit the max blade speed?

My radio is a Hitec Eclipe 7 pro and I have an Optima receiver that is telemetry "ready".

Do I need to get into all that or can I start flying?

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01-19-2015 01:13 PM  3 years agoPost 2
dkshema

rrMaster

Cedar Rapids, IA

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You do NOT need a governor. They are nice to have but not a necessity.

Your radio has two useful features built into it which can be used very successfully to match your heli to the available power. Pitch and throttle curve settings. These two curves can be set to complement each other and to keep the head speed fairly constant while keeping the motor within its power band.

With wood blades you need to insure the blade root reinforcements are properly glued in place. You may want to see if your blades have a listed maximum RPM then adjust the pitch/throttle curves to make sure you remain below the max.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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01-19-2015 01:54 PM  3 years agoPost 3
Josh Kussman

rrApprentice

Superior, NE

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No governor needed. If u know how to setup curves well and have motor running good u can fly hard 3d with out one.
Hopefully u can find out head speed limitswith wood blades but to start I would keep it lower than 1900 maybe even under 1800. I'm sure someone on rr can give u a better idea of head speed. I would start low and work it up if u don't have a head speed tac. If your tail bobs up and down its to low just raise it tell it stops. Hope this helps

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01-19-2015 02:16 PM  3 years agoPost 4
Andy from Sandy

rrElite Veteran

Bedfordshire, UK

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It looks like your question was missed. I read optical RPM sensor as referring to a tacho.

In order to know for sure how fast the blades are turning yes you will need a tacho, however there are governors that allow you to set an actual head speed and it will be what you set. The one that springs to mind is the Aerospire MultiGov. I would hold out hope of finding one second hand. I agree you don't need one but it will remove one layer of doubt about exceeding the safe speed of the blades.

You could go to hobby king and get their magic window tacho which is quite cheap but to safely use it requires a second person.

I don't know the gear ratio of your model but the offload speed of the engine is around 22000rpm. I am guessing this is going to give a head speed in excess of 2000rpm so yes you need to find a way to stop the head speed from exceeding the safe speed of the blades that you quoted.

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01-19-2015 02:42 PM  3 years agoPost 5
Rudy

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Houston TX/Bend OR

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governor??? where in the OP's post did you get governor. Try reading the post before you rush to hit reply

A tach is a very helpful tool to have. My tach gets used all the time because I'm the guy at the field that has one.

The problem is it takes two people to use it. One person to fly the helicopter and one person to use the tach. Not a good thing if you are by your self.

There are tach apps for both Iphones and android phones. This you can do your self. You start the app put the phone on the ground and then hover the helicopter over it.

At least get a phone app, having the headspeed right will make life much better. I would run a 1700 - 1800 head speed on that helicopter/blades. 1700 for learning to hover and normal mode. 1800 idle up 1.

Also on those wood blades (which are just find for learning to fly) be sure to glue the roots on.

Rudy Ackerman Houston TX/Bend OR

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01-19-2015 02:53 PM  3 years agoPost 6
Andy from Sandy

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Bedfordshire, UK

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governor??? where in the OP's post did you get governor. Try reading the post before you rush to hit reply
It appears dkshema took rpm sensor to mean governor.
The problem is it takes two people to use it. One person to fly the helicopter and one person to use the tach. Not a good thing if you are by your self.
Yes noted in my first post.

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01-19-2015 03:09 PM  3 years agoPost 7
Rudy

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Houston TX/Bend OR

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Yes noted in my first post.
You were not who I was talking about. You read the post and provided a good reply

Rudy Ackerman Houston TX/Bend OR

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01-19-2015 06:16 PM  3 years agoPost 8
adamrs80

rrNovice

San Antonio, TX

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Thanks to everybody for your replies. They were all educational to me.

I was talking about an optical sensor for main rotor RPM.

No plans for a governor here.

It looks like I can add the sensor for under $50 so I thought it might be a useful tool for programming and also carburetor tuning. I also plan to stick with wood blades for the foreseeable future and my understanding is that that are more limited than other materials.

Thanks again

Regards,

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01-19-2015 06:31 PM  3 years agoPost 9
Aaron29

rrProfessor

USA

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Yes. A +1 here for epoxying the plastic to the wood. It gives them much more strength.

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01-19-2015 07:22 PM  3 years agoPost 10
HeliRyan

rrApprentice

Colusa ca

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I used the Heli tac app... There's a couple other ones out there too that get the job done with out having to spend $50+

I don't crash, I land at full speed!

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01-20-2015 12:57 AM  3 years agoPost 11
flydan

rrApprentice

lawrenceville GA

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I agree, No need for a gov on nitro really.
It just helps.
I have a 600 nitro with a os 50 running the throttle curve, of.
100 85 80 85 100. and it works REALLY well. Now i have used gov in the past . Multi gov pro. Vbar, Ikon, Align gov. just about them all and they all work well., but for me im going simple and saying F govs. heres a flight of my 700n without a gov.

Watch at YouTube

}:>

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01-20-2015 01:58 AM  3 years agoPost 12
adamrs80

rrNovice

San Antonio, TX

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My blades are just the stock Hirobo blades. They are screwed together at the root. Do I need to take them apart, epoxy them and then re-balance?

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01-20-2015 02:03 AM  3 years agoPost 13
Aaron29

rrProfessor

USA

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Is best if you do.

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01-20-2015 02:17 AM  3 years agoPost 14
flydan

rrApprentice

lawrenceville GA

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back on the gov topic, if you over speed a nitro, you will pop a con rod. ive done it.

}:>

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01-20-2015 02:40 AM  3 years agoPost 15
dkshema

rrMaster

Cedar Rapids, IA

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You asked about the reinforcements on wood blades.

Many wood blades have a heat shrinkable plastic film covering them, or perhaps an adhesive-backed foil, then some form of plastic reinforcements screwed onto the root.

These below had clear plastic heat shrink film and plastic reinforcements.

Slow or medium cure epoxy (30 or 15 minute stuff) gives you a bit of time to get things together. Medium, thick CA - superglue - also works well.

Before unscrewing and removing the blade reinforcements, trace them (top and bottom) with a fine-point Sharpie pen.

Remove the reinforcements, and remember which was top, and which was bottom! Set them aside for a minute or two. Carefully cut the plastic film INSIDE the outline. The dotted line below gives you a good idea of where the cut should go. Don't dig into the balsa, spruce, basswood, or whatever blade material you have. Remove the piece of film.

Coat the insides of the reinforcements with your epoxy or medium thick CA. Reinstall both sides on the blade, screw together, quickly wipe down to remove excess. Let the glue cure.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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01-20-2015 09:32 AM  3 years agoPost 16
HeliHov

rrNovice

NorthEast USA

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Good info Dave, Back to the headspeed issue. I would think using the wood blades that it would be very important not to overspeed them as they would not hold up to the stresses that a carbon fiber blade can handle at higher rpm`s.

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01-20-2015 03:46 PM  3 years agoPost 17
Simmer

rrElite Veteran

Massachusetts

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Well what I have done in the past is go to the local flying field and borrow a friend (and his tach) to initially setup my heli. Once set to your desired RPM (and I would def stay under 2000 on a shuttle) it will not change much, as long as most parts don't change, (engine, blades, etc)

You don't really need on in your flight box as long as you know someone who has one

Carb smart was a really good idea and yes the thermocouple was very fragile and could easily be damaged, must be placed in the proper place. Useful you bet, but it did require an additional servo = weight = one more thing to go wrong

Oh yea, PLEASE fix those blades. Many a heli from those days (shuttle time) blew their blades apart from too high an RPM.

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01-21-2015 02:27 AM  3 years agoPost 18
adamrs80

rrNovice

San Antonio, TX

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Thank you Dave for the detail instructions. I will follow them and go the epoxy route.

I went ahead and ordered the Hitec nitro aircraft telemetry module and the optical RPM and temperature sensor because it was only $12.

I'm going to be traveling quite a bit for the next month starting tomorrow. Hopefully I can get some time mid February to wrap it all up and get flying.

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01-21-2015 04:05 AM  3 years agoPost 19
ICUR1-2

rrElite Veteran

Ottawa, Ontario

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ditch the woodies and get a governor.

I started out with a hawk pro and wood blades, no governor.
I was always apprehensive about the head exploding from user error.
glass fiber blades are safer than wood and less expensive the carbon.

To the OP pm me if you want an inexpensive ATG governor
I installed it but then switched to FBL before I used it
does the gear ratio limit the max blade speed?
yes; but may still be to high for wood blades

spending time, paying attention

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01-21-2015 05:57 AM  3 years agoPost 20
Aaron29

rrProfessor

USA

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I flew wood blades at 1700 rpm on a raptor 30 for over a year. Good cheap blades for learning/crashing. I even stunted with them. Just tach in the 1600-1700 range. No higher.

Wont hurt to do glass or carbons except they are high dollar.

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HomeAircraftHelicopterHelicopter Main Discussion › How critical is blade speed, Do I need an optical RPM sensor ? Nitro Heli
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