Finless's DX7 throttle cut??

kvnm27 · 10-19-2009, 08:15 AM

Finless shows how to setup a thr cut.. Which I have done. However, after talking to a fellow RC'r he said that by cutting the engine there will be leftover fuel in the line and in the cylinder which will increase chances of flooding or bearing wear. Just looking for a few different ideas or opinions on this.

Thanks!

reyd1 · 10-19-2009, 11:27 AM

I use the throttle cut to kill the motor when I'm finished flying. When I put my heli away, I clamp the fuel line and fire up the engine to get rid of any residual fuel in the engine.

chadjay · 10-19-2009, 04:23 PM

I use throttle cut, then clamp line. I never burn the rest of fuel out of carb/line. When I get ready for a start, the last thing I do before the start is unclamp the fuel line. Never any issues with hydro-lock.

I just recently looked inside my OS 50 to see condition of bearings. There are a few tiny rust spots on the crank, but the bearings looked good. Its been since april (maiden) and 6 gallons of fuel later with good results. So, I'm not changing a thing.

kvnm27 · 10-20-2009, 05:30 PM

Thanks for the input fella's. Looks like thrusday is going to be the moment of truth!! First flight!

Anything I need to know before firing off this bird for the first time??

Sonic_BOOMER_SOONER · 10-20-2009, 07:03 PM

Quote:

Originally Posted by chadjay

I use throttle cut, then clamp line. I never burn the rest of fuel out of carb/line. When I get ready for a start, the last thing I do before the start is unclamp the fuel line. Never any issues with hydro-lock.

I just recently looked inside my OS 50 to see condition of bearings. There are a few tiny rust spots on the crank, but the bearings looked good. Its been since april (maiden) and 6 gallons of fuel later with good results. So, I'm not changing a thing.

+1 I no longer burn out excess fuel. I empty my tank and then fill after my last flight of the day so that the clunk isn't exposed to damaging fumes for too long. The only hydrolocks I've had came when I forgot to clamp the fuel line before refueling. If that happens just tilt the heli to the left, over the pipe, and hit the started to clear.

Ed1955 · 10-20-2009, 07:34 PM

I watched his throttle cut video, learned and use it every day I fly. He makes total sense. The only time I have to touch my throttle trim is for starting and I doubt there is anyway around that. If there is, please educate me. I must admit that all machines are not the same. I found that my identical Trex 600N's require different percentages of drop by the switch to kill the motor. My normal procedure is (Keep in mind that I'm still considered a noob when it comes to flying Nitros) after my normal circuits, I bring it down to 10-12 feet and hit throttle hold. Yea, Yea, I know I should know how to do autos from high altitudes by now but I simply don't have the mad money at the time to learn them. I then switch off the throttle hold with the collective stick at it's lowest point and hit the gear switch. The motor dies and I'm either ready for refueling or the Windex bath. The throttle cut will do nothing unless you release the throttle hold though, unless I have something set up totally wrong. I like it because I don't like messing with the throttle trim anymore than I have to. It reminds me to much of plankers. It comes down to personal taste and how much it bothers you to run the servo to it's full throw to kill the motor. I prefer Bob's method pretty much 99.9% of the time. The other .1% would be me wanting more DX7 related videos rather than the 9303 which many of us haven't cleared with the Mrs.
Respectfully,
Ed

kvnm27 · 10-20-2009, 07:57 PM

"I empty my tank and then fill after my last flight of the day so that the clunk isn't exposed to damaging fumes for too long."

So Sonic_BOOMER_SOONER you empty the tank and then fill??? You go home with a filled tank? With 30% this won't break down the fuel line?

chadjay · 10-20-2009, 08:03 PM

My tank is always full unless I'm transporting a long distance. After I fly the tank gets filled up first thing. This pushes the nasty fumes out of the tank. I also use Hayes for my clunk line in the main tank and the header tank. I have had no problems doing this routine. Just keep in mind the Hayes line does grow when its in fuel.

Navigator53 · 10-21-2009, 12:26 AM

I run the tank nearly dry then just purge the fumes by running the elec pump backward filling the empty tank with fresh air ?

ShankBones · 10-21-2009, 12:35 AM

Quote:

Originally Posted by Navigator53

I run the tank nearly dry then just purge the fumes by running the elec pump backward filling the empty tank with fresh air ?

Hey.......That's a great idea, I never looked at it like that..

...Thanks Navi,

Navigator53 · 10-21-2009, 12:47 AM

Welcome Bones

10-19-2009, 08:15 AM	#1
kvnm27 Registered Users Join Date: Mar 2009 Location: US columbia, sc	Finless's DX7 throttle cut?? Finless shows how to setup a thr cut.. Which I have done. However, after talking to a fellow RC'r he said that by cutting the engine there will be leftover fuel in the line and in the cylinder which will increase chances of flooding or bearing wear. Just looking for a few different ideas or opinions on this. Thanks!

10-19-2009, 04:23 PM	#3
chadjay Registered Users My HF Map location Join Date: Sep 2007 Location: Van Wert, Ohio	I use throttle cut, then clamp line. I never burn the rest of fuel out of carb/line. When I get ready for a start, the last thing I do before the start is unclamp the fuel line. Never any issues with hydro-lock. I just recently looked inside my OS 50 to see condition of bearings. There are a few tiny rust spots on the crank, but the bearings looked good. Its been since april (maiden) and 6 gallons of fuel later with good results. So, I'm not changing a thing. __________________ <<450SE V2, CC35, Kong Power 3S 25C 2200, 430XL, 401 w/9650, HS65MG, tail weight mod>> <<Blade MCX with glow-in-the-dark setup, carbon fiber canopy>> <<Yellow 600SNP, 8717s, 770 & 8900G, AR7100, Multigov Pro, Align 2 in 1(used for glow driver only)>>

10-20-2009, 07:34 PM	#6
Ed1955 Registered Users Join Date: May 2007 Location: Pocono Mountains, Pennsylvania	What would we do without Finless????????????? I watched his throttle cut video, learned and use it every day I fly. He makes total sense. The only time I have to touch my throttle trim is for starting and I doubt there is anyway around that. If there is, please educate me. I must admit that all machines are not the same. I found that my identical Trex 600N's require different percentages of drop by the switch to kill the motor. My normal procedure is (Keep in mind that I'm still considered a noob when it comes to flying Nitros) after my normal circuits, I bring it down to 10-12 feet and hit throttle hold. Yea, Yea, I know I should know how to do autos from high altitudes by now but I simply don't have the mad money at the time to learn them. I then switch off the throttle hold with the collective stick at it's lowest point and hit the gear switch. The motor dies and I'm either ready for refueling or the Windex bath. The throttle cut will do nothing unless you release the throttle hold though, unless I have something set up totally wrong. I like it because I don't like messing with the throttle trim anymore than I have to. It reminds me to much of plankers. It comes down to personal taste and how much it bothers you to run the servo to it's full throw to kill the motor. I prefer Bob's method pretty much 99.9% of the time. The other .1% would be me wanting more DX7 related videos rather than the 9303 which many of us haven't cleared with the Mrs. Respectfully, Ed __________________ If only I could fly them as well as I can build them!

10-20-2009, 08:03 PM	#8
chadjay Registered Users My HF Map location Join Date: Sep 2007 Location: Van Wert, Ohio	My tank is always full unless I'm transporting a long distance. After I fly the tank gets filled up first thing. This pushes the nasty fumes out of the tank. I also use Hayes for my clunk line in the main tank and the header tank. I have had no problems doing this routine. Just keep in mind the Hayes line does grow when its in fuel. __________________ <<450SE V2, CC35, Kong Power 3S 25C 2200, 430XL, 401 w/9650, HS65MG, tail weight mod>> <<Blade MCX with glow-in-the-dark setup, carbon fiber canopy>> <<Yellow 600SNP, 8717s, 770 & 8900G, AR7100, Multigov Pro, Align 2 in 1(used for glow driver only)>>

10-21-2009, 12:26 AM	#9
Navigator53 Registered Users My HF Map location Join Date: Mar 2008 Location: Canby, Oregon	I run the tank nearly dry then just purge the fumes by running the elec pump backward filling the empty tank with fresh air ? __________________ When the people find that they can vote themselves money, that will herald the end of the republic. ~Benjamin Franklin ~ To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

10-19-2009, 11:27 AM	#2
reyd1 Registered Users Join Date: Jul 2009 Location: Winter Garden, FL	I use the throttle cut to kill the motor when I'm finished flying. When I put my heli away, I clamp the fuel line and fire up the engine to get rid of any residual fuel in the engine.

10-20-2009, 05:30 PM	#4
kvnm27 Registered Users Thread Starter Join Date: Mar 2009 Location: US columbia, sc	Thanks for the input fella's. Looks like thrusday is going to be the moment of truth!! First flight! Anything I need to know before firing off this bird for the first time??

10-20-2009, 07:57 PM	#7
kvnm27 Registered Users Thread Starter Join Date: Mar 2009 Location: US columbia, sc	"I empty my tank and then fill after my last flight of the day so that the clunk isn't exposed to damaging fumes for too long." So Sonic_BOOMER_SOONER you empty the tank and then fill??? You go home with a filled tank? With 30% this won't break down the fuel line?

10-21-2009, 12:47 AM	#11
Navigator53 Registered Users My HF Map location Join Date: Mar 2008 Location: Canby, Oregon	Welcome Bones __________________ When the people find that they can vote themselves money, that will herald the end of the republic. ~Benjamin Franklin ~ To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

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