That's the same method they use to install stoplights ... wait until someone is killed trying to cross the street before installing one.

No thanks, I prefer to be more pro-active than that, especially when the cost is negligible....

Bad analogy!!! If we didn't have stoplights people would be getting killed everyday!!!!! Out of how many heli flights that don't carry a failsafe function have killed someone. I'll bet it's ZERO!!! You must be a man who worries of the little things in life and feeds off silly arguments. I agree saftey of my peers is an important matter but with the variables of heli flight a failsafe is more worthless than it is worth something. You've contorted THIS ISSUE and look ignorant!!! I didn't come here to create any arguments with fellow members. I came to learn as much as I can and potentially pass any input to the newer members if needed. I'm happy to be a new memeber and value this site. I'm surprised to see a man of your caliber flying helicopters. Or are you???

Why the anger?

Neither of us have these stats and there are a lot more cars than RC helis ....

It's a simple matter; I can safely say my heli will not wander over a crowd due to interference or Tx failure, can you?

Do I fly helis? Just a few (LMH, Nexus, Raptor, Mystar, Hummingbird).
Here's a pic of me at the '99 Nationals....

And try less caffeine buddy.

Your sense is ill. Your rebuttals get weaker and weaker. I'm done with your nonsense.

"Tis a weak mind that resorts to insult when losing an argument."

Let me turn your question back on you, Do you even fly helis?

I agree and understand your fantastic "QUOTE". I would suggest listening to it so you know when to use it.
I have sim experience, what's your point? This topic is about modulation. Not who has more heli experience.

Nope, it's about a REAL comparison. I have 30 years of field experience (5 with am, 25 with ppm, 10 with pcm, 7 of these with helis). I've experienced real radio hits and the benefits of fail-safe firsthand (with witnesses that are on this forum). I also have an engineering degree (specialising in digital electronics) from the University of Toronto (where I work part time) and I work full time as a systems designer for a major bank... but your double digit sim time obviously makes you better qualified.

Now that the personal drum beating is out of the way, why not try this from a more formal logic approach and prove to me why fail-safe is useless in a heli. Are you familiar with failure mode analysis? For example, why would a decay in potential energy of the head not be beneficial in the case of loss of control?

You obviously have more REAL experience flying helicopters. I failed to mention I own an nitro LMH 110. I also have several years of REAL (which includes real FM) flying fixed wing under my belt and experienced many radio hits. Your argument is based on chance and mine on probability. You say "failsafe has been beneficial". I'd like to here from the people that were nearly hurt or even killed from your helicopter due to lose in radio frequency. I'd also like you to prove how a failsafe function HAS SAVED a life!!

To answer your redundant point AGAIN since you like to carry on and on and on. Where in this forum have I or any of the other members quoted "failsafe as being useless"?? No Body. Simply an explanation of what the originator meant by "useless".

Thankfully that list is zero in length ... I fly PCM and fail-safe brought my heli down well within the designated flying area on a couple occasions. If I was flying FM, I can't predict where it would have impacted but I can predict it would have released a significantly greater amount of energy....

"Razmo" if we can get beyond the bashing, maybe we can communicate.

Precisely.

Q) What is the most common cause of interference in a heli?
A) high frequency vibration (espc. metal to metal eg. crack in header).

Q) How do you reduce vibration in a heli?
A) reduce throttle

Q) How do you reduce throttle if you have no control due to interference?
A) fail-safe

I've had a couple saves granted by fail-safe dropping throttle (eliminating source of interference), returning control for me to auto to safety. Most recent was last June when I had a muffler bolt break.

And this is yet another reason (beside my aforestated reasons of (1) reducing potential energy in a crash and (2) controlling distance covered when control is lost.)

Useless?
You do the math....

Anyone can draw a line Jim. I'm really begining to feel ill. Good luck to you.

Cheers bud!

captain18

72000 is just above 16 bits., so your 3600 bits is way off. But indeed you have some 6 bits more, about 70 cycles per 'bit'. I have no idea how many are needed to switch between on and off, I just quoted what I heard.

My grandpa used to always say some old saying about "bits" but I think he was talking about money, LOL One thing that I am really impressed about by this thread though.....is the fact of all the combined education/experience in electronics these forum users have! If I ever have a electronic question from now on, I know where to go! This topic went way beyond the original question to the heart of the facts! Good information, guys.