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HomeAircraftHelicopterHelicopter Main Discussion › Throttle mixing on raptor 50 titan
09-21-2013 07:44 AM  5 years agoPost 1
doctor

rrApprentice

Clear blue sky

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HI,

Just a newb question. How to do the throttle mixing on Raptor 50 titan.

Engine : OS 50 hyper without governor n i run 15% nitro

Radio is JR propo DSX7.

HAd gone through the raptor technique.com but couldnt get specific instructions for my radio.

Can anyone explain it in a stepwise simple way.

Thanks in advance.

Regards

Doc

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09-21-2013 12:58 PM  5 years agoPost 2
doctor

rrApprentice

Clear blue sky

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Bump...

Help me out guys.

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09-24-2013 02:28 PM  5 years agoPost 3
Dagigalo

rrApprentice

Buffalo IA. USA

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I'll look what I have on mine tonight After work and I'll get back to you.

Gravity SUCKS!!!!!

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09-24-2013 03:50 PM  5 years agoPost 4
Tyler

rrElite Veteran

Chicagoland area

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You will create two programmed mixes in your radio.

Remember, as the cyclic is adding pitch to change the heading of your model, the engine will realize a higher load. This aileron-to-throttle curve is created to help give the engine a little more power a little sooner than a standard throttle curve alone. The standard throttle curve is already mixed with the collective. As the pitch increases the engine will realize a higher load. The throttle curve anticipates this and adds more throttle in a proportional relationship to the pitch.

The first mix will use aileron as the master channel and throttle as the slave. Start off with a small value like 15%. Full aileron stick will give you about 15% additional throttle to your throttle curve. This is proportional, so little aileron inputs will result in little added throttle.

Create a second mix for elevator the same way.

I don't own your radio so I am not certain if you will see a line graph in your mixing screens or if you will simply see numerical values.

I would have these mixes active at all times, not assigned to a switch.

You may also have to ensure that the mix works for both direction of aileron stick movement and both directions for elevator movement.

An effective throttle curve is essential to begin with.

Also, you will need to spend considerable time ensuring that your throttle geometry for the carb is perfect. The carb must close at your engine kill position. The carb must hit the mark for idle, half throttle, and full throttle perfectly with no binding. There is a reason for all of this.

If your carb is behind the ball, so to speak, your engine is always trying to add power after the additional load is realized. However, if your carb is adding power slightly before the load is added to the demand of the engine, the engine won't bog down and it will run cooler.

Follow this link, it revolutionized my modeling experience and truly works...

http://www.ronlund.com/rcheli/ARCHIVE_THROTTLE.html

Initially it took me two hours to get my first model following this principle perfectly. Each model became successively easier to set up properly.

Enjoy things that money can buy IF you don't lose the things money can't buy.

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09-24-2013 03:52 PM  5 years agoPost 5
Tyler

rrElite Veteran

Chicagoland area

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Here you go. Start on p. 97

http://www.spektrumrc.com/ProdInfo/Files/DX7_Manual.pdf

Enjoy things that money can buy IF you don't lose the things money can't buy.

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09-24-2013 04:00 PM  5 years agoPost 6
Paul Woodcock

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Dubai - United Arab Emirates

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Hi

You need an "open throttle" value for both left and right aileron and the same for elevator.

The problem with the DX7, is the mix will allow an overdrive situation to occur. If you are at 3/4 collective/throttle and you give an aileron input, the throttle will increase by the amount of the mix (15% as suggested above). This is great..... but at full throttle, when you get the extra 15% it will bind the carburettor and stall the throttle servo. This is very bad. I have seen guys making some spring loaded sliders to overcome this.

If you are flying hard enough to notice this, i would suggest investing in a governor. They are quite cheep, esp here on RR as people are using the built in gov function on some of the FBL units and selling of their old stand alone governors.

Regards
Paul

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09-24-2013 04:08 PM  5 years agoPost 7
Tyler

rrElite Veteran

Chicagoland area

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pwood,

Thanks for adding your input. I was going to mention the overdrive situation but was going to look for information on that topic first. Do you have any helpful links?

Ultimately I agree that a governor is a much better option, especially when they can be purchased here for $25. The align is my favorite.

Enjoy things that money can buy IF you don't lose the things money can't buy.

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09-24-2013 04:18 PM  5 years agoPost 8
Paul Woodcock

rrElite Veteran

Dubai - United Arab Emirates

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Hi

There is no electronic solution on the DX7.

I have seen small coil springs and wheel collars used to make an overdrive proof mechanical linkage..... But there is metal to metal vibration issues....

I would suggest a good throttle curve. When you fly well enough to get bogging, get a gov.

Cheaper than an upgraded radio that has limits to a p-mix.

Regards
Paul

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09-24-2013 11:59 PM  5 years agoPost 9
TMoore

rrMaster

Cookeville, TN

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What sort of mix are we talking about?

Delayed Response Operator Not Engaged
AMA SECTION 336 = Good
Drones = EVIL

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