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HelicopterEngines Plugs Mufflers Fuel › Question about bad hot start
09-12-2007 02:49 AM  10 years agoPost 1
MJHiscott92504

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James Hiscott , Germany for past 11 months

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I have heard of this Hot Start and damage it can cause, just read about a bad clutch do to hot start, what is "hot start" and what damages can come from it?

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09-12-2007 06:17 AM  10 years agoPost 2
jsenicka

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Eagle River, WI

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Hot start = starting with throttle above idle. Usually caused by mode switch in idle up. Typically results in a wrecked clutch liner, clutch (from being over sprung) and sometime a damaged clutch bell.

Can usually be avoided by a thorough pre-start check. For me it is "all switches up/back, and throttle to bottom of travel, and correct model set". I go through this check on every start, even if flying same heli back to back.

Risk of hot start is why you hold the head with one hand while cranking. It is also wise to have a plan. Such as "should I hot start, I will immediately engage the fuel line pinch with the hand I use on the starter, while continuing to hold the rotor head stopped with my other hand"

Jim Senicka
Team Manager, GrandRC Flight Team

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09-12-2007 07:12 AM  10 years agoPost 3
MJHiscott92504

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James Hiscott , Germany for past 11 months

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TY

Thank you for the insight and information, knowledge is power my friend....Jim

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09-12-2007 03:31 PM  10 years agoPost 4
BarracudaHockey

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Jacksonville FL

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Everyone does it once

Andy
AMA 77227
http://www.jaxrc.com

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09-12-2007 05:50 PM  10 years agoPost 5
lrogers

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Mobile, Al

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And after you've done it once (and changed your pants), you will be much more careful during your pre-flight check list!

Larry Rogers - R/C Helicopter Pilot

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09-13-2007 06:43 AM  10 years agoPost 6
jsenicka

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Eagle River, WI

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Exactly.
came home about a year back with my almost brand new Raptor 90SE covered in blue clutch lining and no flights that day. Did my normal switch check, but knocked the throttle up with the wire to my glow igniter. Hard to believe how fast a C-Spec could come up to full power. I got the fuel clamp on quick, but still destroyed my clutch lining, clutch, and even damaged the bell.
Since then my start routine includes keeping the transmitter farther out of harms way, and always selecting throttle hold on start up.

Jim Senicka
Team Manager, GrandRC Flight Team

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09-13-2007 12:34 PM  10 years agoPost 7
airdodger

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Johnston USA

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It will shut the engine down quicker if you block the exhaust.

Chris

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09-13-2007 01:16 PM  10 years agoPost 8
jsenicka

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Eagle River, WI

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wrong side of the heli on a Raptor

Jim Senicka
Team Manager, GrandRC Flight Team

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09-13-2007 01:45 PM  10 years agoPost 9
GyroFreak

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Orlando Florida ...28N 81W

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wrong side of the heli on a Raptor
Then start on that side.

I have a flexable exhust diverter, pinch that shut and imediate shutdown, can be the diff between burned out clutch or usable clutch.

I think about the hereafter. I go somewhere to get something, then wonder what I'm here after ?

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09-14-2007 01:07 AM  10 years agoPost 10
ZXXflyer

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stone mountain, georgia, US

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See my posts in the QuickWW section! I did it last week bacause my 9C was set on the srong model and I have been flying for 5 years!
The O.S. .61 fired right up on the first bump of the starter and proceeded straight to 100% power. Whole thing only lasted 4-5 seconds before I snagged the carb line, but the whole heli looked like it flew through a dust storm... a clutch dust storm!

Thankfully did not damage the $50 clutch, and amazingly didn't even eat more than a few thousandths off the liner..

Total damage $100?

Busted a brand new $50 metal tail, bent da boom, bent tail shaft, damage to main blade roots and tail blades.

I had my hand on it the whole time, but when the tial swung around at 100mph and hit my hige 30lb filed box, the mains got yanked out of my hand while trying to throw the starter down, and luckily the starter cord caught a main and wrapped around it... so the mains only spun half a turn, but one struck the boom. The tail hub was bent horribly as were the tail grip bolts... sad news is that HHI no longer makes the hub!

Believer in Weston motors!

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09-14-2007 02:22 AM  10 years agoPost 11
Niko

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MD, USA

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Checklist

When I used to fly airplanes I had made 2 checklists for myself. One was for pre start and one for pre takeoff. I had laminated them and used them every time. I am not using them on my helis right now but I try to follow the exact routine every time before I start and fly. Full size pilots also do this as forgetting some things could be fatal.

For those who have had a smimilar incident, like myself, it becomes obvious that they need something to prevent it from happening. I am writing this more for those who havent experienced this. A routine where one does the same thing every time before start and takeoff is not a nicety but a necessity.

Niko

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09-14-2007 02:29 AM  10 years agoPost 12
Maxists The Baddist

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Pa

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The thing that stands out in my mind about the times I've done a hot start is the smell of the clutch lining being burned. For some reason I will never be able to forget that smell.

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09-14-2007 02:44 AM  10 years agoPost 13
cwright

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Blossvale New York

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I usually start mine in throttle hold. That way if I accidently hit the throttle nothing bad happens. Chuck

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