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HomeAircraftHelicopterGasser Model RC HelicoptersOther › Spectra tail grips step 1
03-13-2010 03:09 PM  8 years agoPost 1
smallplanes

rrElite Veteran

S.C. ,SSA

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I got the pics in my gallery if anyone wants to see them. I messed it up though i forgot to cut the slot in it before i took it out the machine and i have no real way of locating it back straight enuff to cut the slot perfectly with the leg for the ball. I may do some change this is just the first try at it.

Thanks
smallplanes


Spectra G 26cc
Jewel
Bat 27cc
Trex 700<br

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03-13-2010 03:57 PM  8 years agoPost 2
rbort

rrProfessor

Franklin, MA - USA

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I saw a cylinder
Wow, I can appreciate all the work that it takes to make one. Its like staring with a block and cutting the whole things down into something you want. Its like you said there are many steps but looks like a good start

-=>Raja.

MA 1005 Hanson 280, 4210 flts
Spectra 27 3DMax, 3280 flts
Whiplash V1-2 Hanson 300, 1555 flts
Whiplash V2 Hanson 300, 393 flts

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03-13-2010 03:59 PM  8 years agoPost 3
smallplanes

rrElite Veteran

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I know some of you think it looks a little heavy but when i cut the slot and cut the bearing hole and drill and tap the hole for the ball it will be a lot lighter. Like i say this is a test run i may make them different in the end i just wanted them a little beefer than the Aluminum grips from MA. There not fansy but the will be there long after the heli is shot. If anyone has any input let me know?

Thanks
Ivan


Spectra G 26cc
Jewel
Bat 27cc
Trex 700<br

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03-13-2010 04:05 PM  8 years agoPost 4
rbort

rrProfessor

Franklin, MA - USA

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If I can give some input
They have to be light because extra weight will stress the tail rotor system as we've seen over the years. Remember Minair said only CF blades with the solid hub no heavy plastic blades. I think Justin has a set if I'm not mistaken, you might want to ask him to weigh one for you and give you an idea of what yours should come out as.

-=>Raja.

MA 1005 Hanson 280, 4210 flts
Spectra 27 3DMax, 3280 flts
Whiplash V1-2 Hanson 300, 1555 flts
Whiplash V2 Hanson 300, 393 flts

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03-13-2010 04:10 PM  8 years agoPost 5
smallplanes

rrElite Veteran

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So your telling me the tail want hold up if i make the grips a little heavier? I wish someone would have told me this a while back. If i have to make them just a thin as MA'S i will not make them. I have a set of the Aluminum grips here i bought from Mike545.

Thanks


Spectra G 26cc
Jewel
Bat 27cc
Trex 700<br

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03-13-2010 05:06 PM  8 years agoPost 6
j.8

rrVeteran

Denmark

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Hi

Anotherthing about increased weight, it will stress the
tail servo alot more.

But if you still want to make some, perhaps you can make
them as light as the MA ones, but with the build in weights,
that would not only benefit the spectra people but the
stratus ones aswell.
Have to say, if you go down that road, it will take alot
of experimenting.

Regards bo

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03-13-2010 05:40 PM  8 years agoPost 7
smallplanes

rrElite Veteran

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I did not think the little extra weight would hurt anything but i guess i was wrong. I WILL not make them as light as MA made theres i just don't trust the light weight grip. That just me i'm sure they hold up fine or we would hear about it. I got a few more tricks up my sleave we'll see. Thanks for the input keep it coming.

Thanks


Spectra G 26cc
Jewel
Bat 27cc
Trex 700<br

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03-13-2010 07:58 PM  8 years agoPost 8
rbort

rrProfessor

Franklin, MA - USA

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Chinese weight mods
If you've heard of the chinese weight mods that go on tail grips maybe you can make some with built in weights for the balance.

Just a thought!

Also, a little extra weight might not hurt anything but too much could turn into a problem.

-=>Raja.

MA 1005 Hanson 280, 4210 flts
Spectra 27 3DMax, 3280 flts
Whiplash V1-2 Hanson 300, 1555 flts
Whiplash V2 Hanson 300, 393 flts

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03-13-2010 08:30 PM  8 years agoPost 9
smallplanes

rrElite Veteran

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Raja the first time i made the spectra grip i had the weight mod on it bit i milled the rest of the grip to thin so i abandon the mod and went for stock type grips. I may do some changing to the grip,but if i do it will add weight when everyone is saying to lighting the grip so i'm stuck. I will do a few more different styles and will see how it goes.
Thanks for the input.

Thanks
smallplanes


Spectra G 26cc
Jewel
Bat 27cc
Trex 700<br

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03-13-2010 08:54 PM  8 years agoPost 10
oldfart

rrProfessor

Vancouver, Canada

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The problem with any tail rotor system, is not so much the weight of the grips and blades combined, as the weight is relatively close to the rotating axis.

The bigger issue is that of damping and harmonic flutter.

Unlike main rotor heads, tail rotors usually do not have any form of damping to absorb minor dynamic forces caused by blade lead-lag discrepencies, blade instabilities or in flight tip flex resonances etc. other then that which may be available from a less rigid grip, like one made of a proper GRP plastic.

So if you now take away even that minor damping capability, by replacing them with more rigid CNC grips, all of these resonant type of forces will now all have to be absorbed by the spindles on which these blade grips are supported. The result, if one does not use blades that are designed to be dynamically neutral, is that a relatively high rate of metal fatique will result, and the spindle will break. I am sure you can envision the final result when this happens. Many have probably already seen it.

NOTE: making the grips of even a harder, more rigid metal such as titanium, can be even worst on a tail rotor that has blades with dynamic instabilities and tip flutter resonances. That is because titanium is more brittle then a softer aluminum, so it will be less friendly to these type of stresses. (That is also why it would not be good to use for a throttle arm either, as the constant vibrations it will be exposed to may quickly result in a metal fatique failure.)

A very rigid tail rotor can be very beneficial, but only if all the forces acting on the spindle are ROTATIONAL forces, that are only acting through the center of the bearings that ride on it.

This can only be accomplished with very rigid tail blades that have all control forces acting at this pivot point. The center of lift of these blades must always be located, at all angles of attack, at this pivot point. Unfortunately such type of tail rotor designs are very limited in number. I only know of one.

Phil

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03-13-2010 11:04 PM  8 years agoPost 11
Sean Bosse

rrApprentice

Germantown, MD.

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They look good Ivan. Can't wait to see the finished product. Keep up the good work!

Sean

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03-13-2010 11:16 PM  8 years agoPost 12
smallplanes

rrElite Veteran

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Thanks Sean.

olddude i'm not sure what your talking about can you put that in blue coller terms?

Thanks for the input
Ivan


Spectra G 26cc
Jewel
Bat 27cc
Trex 700<br

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03-13-2010 11:28 PM  8 years agoPost 13
Scorpion

rrApprentice

Socal USA

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Carbon fiber tail rotor blades
Hey oldfart,
Are carbon fiber blades the best to use on the tail rotor? or what do you recommend.

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03-14-2010 01:46 AM  8 years agoPost 14
Justin Stuart (RIP)

rrMaster

Plano, Texas

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I think if you made the CNC grips with a Chinese Weight mod, you could sell a lot of them to MA pilots. Looks like a good start.

Avant RC
Scorpion Power Systems
Thunder Power RC
Kontronik Drives

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03-14-2010 04:10 PM  8 years agoPost 15
smallplanes

rrElite Veteran

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Well back to the drawing board. Thanks guys for the tips. I only have one question for some of you how can i make them light with the china mod made into them?

Thanks
smallplanes


Spectra G 26cc
Jewel
Bat 27cc
Trex 700<br

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03-14-2010 06:11 PM  8 years agoPost 16
j.8

rrVeteran

Denmark

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Hi smallplanes
Well back to the drawing board. Thanks guys for the tips. I only have one question for some of you how can i make them light with the china mod made into them?
good question, but when I said as light as the MA ones, but with
build in weights, I actually ment MA style but with weights,
that little extra weight from the "weights", I really don`t
think will cause any problems. But only tests will show.

With the weight mod, I think you can make a lot of
spectra, stratus and ion-x tail servos last longer, and
work alot more effecient

Regards Bo

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03-14-2010 07:09 PM  8 years agoPost 17
smallplanes

rrElite Veteran

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Well i'm going to redraw it in Cad and see how it looks. But like i said i'm not going to make them as thin as the MA one even if i have to stop the project altogether. I will test them on my heli before i let anyone else test them.

Thanks for the tips keep them coming
Ivan


Spectra G 26cc
Jewel
Bat 27cc
Trex 700<br

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03-14-2010 07:12 PM  8 years agoPost 18
smallplanes

rrElite Veteran

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One more thing i do not plan on competing with MA if they make a set i will pull mine from the drawing board i'm only doing this because MA does not offer the Aluminum grips and a lot of you want them. It's not for the money it's just to help the people in the gasser forum.

Thanks
Ivan


Spectra G 26cc
Jewel
Bat 27cc
Trex 700<br

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03-14-2010 07:17 PM  8 years agoPost 19
smallplanes

rrElite Veteran

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There are some people trying to take work from other guys but i'm not like that i will stop just as soon as MA makes there own set. I make enuff money in the manufacturing world that this hooby stuff can't compete. I'm just doing it for the people.

Thanks
Ivan


Spectra G 26cc
Jewel
Bat 27cc
Trex 700<br

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03-14-2010 07:20 PM  8 years agoPost 20
rbort

rrProfessor

Franklin, MA - USA

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Thanks Ivan
We all greatly appreciate what you do for us here in the hobby! I know the hobby stuff is like small potatoes compared to the other stuff that machinists make, and I'm really glad to find someone like you who will spend his own time offhours making things like this for us hobby people. People like you are rare and hard to find

-=>Raja.

MA 1005 Hanson 280, 4210 flts
Spectra 27 3DMax, 3280 flts
Whiplash V1-2 Hanson 300, 1555 flts
Whiplash V2 Hanson 300, 393 flts

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HomeAircraftHelicopterGasser Model RC HelicoptersOther › Spectra tail grips step 1
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