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600 Class Nitro Helicopters 600 Class Nitro Helicopters manufactured by Align, Tarot, SYMA, Airhog, Chaos, HK and similar.


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Old 02-22-2008, 04:06 AM   #1 (permalink)
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I was at the yesterday morning flying my 600N and noticed a guy with his 600 strapped to a table. He said that he was breaking his engine in. He told me he sets his normal pitch curve to 0 degrees all the way across and straps his heli down for safety and breaks his engine in that way. Just wanted to post this to see what you guys think. If you guys think this would work I think I will try it on my second 600N that is almost finished. What do you guys think?
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Last edited by ghayes; 02-22-2008 at 04:09 AM.. Reason: spelling
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Old 02-22-2008, 04:36 AM   #2 (permalink)
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I'm thinking serious overspeed!!

Is he new to heli's or something?

Surely a new motor needs to be under some load?

Tom
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Old 02-22-2008, 04:41 AM   #3 (permalink)
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He said that he was breaking in his first heli and the engine cut out on him while hovering causing him to crash. So he came up with this idea to stop him from crashing due to engine cutout during breakin. He said he's broke in two other helis that way. Sounded interesting. Thought I would get thoughts from people here. So you think overspeeding would be a problem? Maybe if you put 1 to 2 degrees of pitch all the way across it would help. I just thought it looked funny. I've only been flying nitros for about 2 months.
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Last edited by ghayes; 02-22-2008 at 04:45 AM.. Reason: edit
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Old 02-22-2008, 04:57 AM   #4 (permalink)
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Yeah, it wouldnt even take 1/4 throttle on a 50 to get up to around 2000 rpm with no pitch on the blades. In Bob's break in video on the 600N he talks about keeping the rpm different in the break in. I would of thought that to break an engine in the throttle needs to be exercised. The only way to do that is to add load that way increasing throttle while not affecting headspeed.

Also part of the break in process is tuning the engine. That cant be done under no load. When the engine is broken in like that and then flown it is not tuned for load. must be a big shock factor to a new engine that only knows what unloaded running is then being forced to run +11 -11 pitch

Sounds like madness to me. I dont know what someone who cant auto from a hover is doing flying helis anyway

I would say you would do well not to accept any advice of that guy

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Old 02-22-2008, 05:01 AM   #5 (permalink)
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ghayes,

Just reading over my last post and it sounds a little harsh :o If i were you I would hover it to break it in. I see you have a few helis already and i'm sure you could auto down from a hover.

I personally look at break in not only dfrom the engines point of view. In this period you can fine tune trim and gyro function and get a general feel for the heli. Seems a waste to strap it to a bench.

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Old 02-22-2008, 08:23 AM   #6 (permalink)
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Sounds like a good way to break something. Look up "ground resonanance"

He must have been reading an old copy of Rays Helicopter Manual. Did he have a motorcycle helmet on?
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Old 02-22-2008, 08:47 AM   #7 (permalink)
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nice post subject line, btw. really gets to the heart of the topic
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Old 02-22-2008, 10:37 AM   #8 (permalink)
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If the engine was cutting out, it sounds like the mixture was wrong. Did he try fiddling with that before giving up and resorting to the bench method?
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Old 02-22-2008, 11:08 AM   #9 (permalink)
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Quote:
Originally Posted by cudaboy_71 View Post


nice post subject line, btw. really gets to the heart of the topic
Ooh natural frequency at it's greatest! That's pretty crazy!

Hovering to break an engine is much more fun that strapping it to a bench.
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Old 02-22-2008, 01:09 PM   #10 (permalink)
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I thought it looked a little crazy. Seen him again this morning while I was flying. He was messing with the engine needles the whole 2 hours I was there. Just seeing that now I know his idea is no good. It onlyy took me about 6 - 7 tanks to get my engine set. Haven't touched my needles yet. Think I'll stick with the normal method of breakin. Thanks for your comments. I knew I'd get the right answer here.
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Old 02-23-2008, 02:54 PM   #11 (permalink)
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I'm cracking up reading this post, now if he's at a club don't you have season heli pilot to help him out?

You need to do him a favor and give him helifreaks website and point him to Bob's videos, I'm new to nitro (since Nov, have 7 gallons on my bird) I don't spend more than five minutes to get my bird in the air.

Your friend needs help.

Thanks

Robert
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Old 02-23-2008, 04:35 PM   #12 (permalink)
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I told him about this website. He said he woud check it out. I can see where he's coming from, he works third shift like I do and there is noone around in the morning. Luckily I found Helifreak a while back. Now hopefully he will see the light.
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Old 02-25-2008, 10:08 AM   #13 (permalink)
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Quote:
Originally Posted by BarracudaHockey View Post
Sounds like a good way to break something. Look up "ground resonanance"

He must have been reading an old copy of Rays Helicopter Manual. Did he have a motorcycle helmet on?
You can not get ground resonance in a two bladed rotor system
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