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RE: Extreme Flight 88" Yak - Build and Fly - 3/12/2009 8:49 AM   
Absolut Yak



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Doug

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RE: Extreme Flight 88" Yak - Build and Fly - 3/12/2009 4:24 PM   
propchief


 

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Status: offline 		Go with the pipe or cannister if you prefer less noise. I started my gas experience with a pitts rear dump muffler and quickly swapped that out for a cannister ... quieter and more pleasing (IMO.) Going to use a pipe next.

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RE: Extreme Flight 88" Yak - Build and Fly - 3/13/2009 5:21 AM   
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I was doing inverted flat spins and a senior very experienced pilot came over and asked how I did it.....big smile
I love this plane!
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RE: Extreme Flight 88" Yak - Build and Fly - 3/13/2009 5:32 AM   
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Status: offline 		Man I'm jealous! I haven't flown mine in so long!! Now that I'm almost moved into my new place,I hope to get out next week,as long as the weather stays "Jersey Fresh"...


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RE: Extreme Flight 88" Yak - Build and Fly - 3/13/2009 6:49 AM   
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ORIGINAL: xtraflyr

Man I'm jealous! I haven't flown mine in so long!! Now that I'm almost moved into my new place,I hope to get out next week,as long as the weather stays "Jersey Fresh"...

xtraflyr,
Spring has sprung down here, it's commin' you way I'm sure! Hang in there!
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RE: Extreme Flight 88" Yak - Build and Fly - 3/13/2009 6:51 AM   
diamondave



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Status: offline 		you guys that have used choke servos, what do you use? is a standard old nylon gear good enough, like a 425, or do we need metal for vibration like a 645? just curious, thinking about adding to a few planes

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RE: Extreme Flight 88" Yak - Build and Fly - 3/13/2009 6:57 AM   
Gatorb8


 

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ORIGINAL: diamondave

you guys that have used choke servos, what do you use? is a standard old nylon gear good enough, like a 425, or do we need metal for vibration like a 645? just curious, thinking about adding to a few planes

diamondave,
I use a optical ignition kill and manual choke, can't help ya there
I do use a hi-tec 225-mg mini on the throttle though, would use another if I did a choke
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RE: Extreme Flight 88" Yak - Build and Fly - 3/13/2009 7:08 AM   
diamondave



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Status: offline 		yeh some people say even though the 225 has the torque, the smaller gear set cant handle vibration, i just got the chinn yak with a saito 82 and ef says to use any standard size case servos just for that reason, even on that small thing, so not sure about 225's on a big gas plane, i use 5625's on my throttles, i know you dont need the torque but those are nice and quick too on 6v, anyway for choke its only used to start it, i wont use it to kill it, but i still wouldnt want to have gear sets going bad even if its on something not as "important"

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RE: Extreme Flight 88" Yak - Build and Fly - 3/13/2009 7:13 AM   
Gatorb8


 

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ORIGINAL: diamondave

yeh some people say even though the 225 has the torque, the smaller gear set cant handle vibration, i just got the chinn yak with a saito 82 and ef says to use any standard size case servos just for that reason, even on that small thing, so not sure about 225's on a big gas plane, i use 5625's on my throttles, i know you dont need the torque but those are nice and quick too on 6v, anyway for choke its only used to start it, i wont use it to kill it, but i still wouldnt want to have gear sets going bad even if its on something not as "important"


Thanks for the feedback, I'll look into it, may be a weak link.....? I thought Curtis told me it would be ok, I'll call and ask.
Gator

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RE: Extreme Flight 88" Yak - Build and Fly - 3/13/2009 7:17 AM   
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Status: offline 		Ive been using the 225mg mini on mine for 2 years without a problem,OOPS!! Hope I just didn't jinx myself!!


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RE: Extreme Flight 88" Yak - Build and Fly - 3/13/2009 7:23 AM   
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Ive been using the 225mg mini on mine for 2 years without a problem,OOPS!! Hope I just didn't jinx myself!!

EFYAKINVERTEDFLATSPINHOVERKNIFEEDGEWATERFALLROLLINGHARRIERLOOOOOOOOOOOOOOOOWPONDDIP
There, the jinx has been negated!
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RE: Extreme Flight 88" Yak - Build and Fly - 3/13/2009 3:25 PM   
diamondave



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Status: offline 		well they told me for the surfaces on the chinnyak anyway, mini is okay for throttle, but someone on here once said they had 225 go bad on throttle of gas plane, i think more than one person mentioned that actually, maybe they will chime in

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RE: Extreme Flight 88" Yak - Build and Fly - 3/13/2009 5:50 PM   
Absolut Yak



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Status: offline 		Had a 225 on the throttle and killed the gear train. I've run a 5625 for 400 plus flights without a hitch. Believe it or not, I have a 5955 on my choke on my 110" Yak. Why? Because I had one that wasn't doing anything. AND, it can handle my A123 voltage unregulated.

Doug

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RE: Extreme Flight 88" Yak - Build and Fly - 3/13/2009 6:15 PM   
Gatorb8


 

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quote:

ORIGINAL: diamondave

well they told me for the surfaces on the chinnyak anyway, mini is okay for throttle, but someone on here once said they had 225 go bad on throttle of gas plane, i think more than one person mentioned that actually, maybe they will chime in

diamondave,
I did a search on "225 and mg and throttle" , found a small sample of mixed results. Some used for years with no problem, some had repeated failures.

I can see where setting a throttle servo up on a digital servo is critical. If the endpoints are not set perfect, with limits and low idle in mind, it would be easy to kill a throttle servo. Some radios have the capability, some don't.

I am concerned to hear about "any" 225mg throttle failures, think I'll just change it out. I'll take it apart and take a close look, has about 6 gallons on it.
thx
Gator

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RE: Extreme Flight 88" Yak - Build and Fly - 3/13/2009 6:25 PM   
cjcyclesrc



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Status: offline 		Dave,

I've used 3004 Futaba's and 475 Hitec's without any problems on the choke. None of my planes have choke servos now but I like having them. I used to always kill my DA50 with the choke and I would start back up on the first flip probably 8 out of 10 times when I go out for another flight.

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RE: Extreme Flight 88" Yak - Build and Fly - 3/13/2009 9:17 PM   
xtraflyr


 

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quote:

ORIGINAL: Gatorb8


quote:

ORIGINAL: xtraflyr

Ive been using the 225mg mini on mine for 2 years without a problem,OOPS!! Hope I just didn't jinx myself!!

EFYAKINVERTEDFLATSPINHOVERKNIFEEDGEWATERFALLROLLINGHARRIERLOOOOOOOOOOOOOOOOWPONDDIP
There, the jinx has been negated!
gator

Thanks Gatorb8! I feel much better now!!


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RE: Extreme Flight 88" Yak - Build and Fly - 3/13/2009 10:26 PM   
tashley



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Status: offline 		I have a 225 on my choke and it seems to be fine for the job. I also use it for a kill.

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RE: Extreme Flight 88" Yak - Build and Fly - 3/14/2009 5:45 AM   
diamondave



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ORIGINAL: cjcyclesrc

Dave,

I've used 3004 Futaba's and 475 Hitec's without any problems on the choke. None of my planes have choke servos now but I like having them. I used to always kill my DA50 with the choke and I would start back up on the first flip probably 8 out of 10 times when I go out for another flight.



thanks, i will try a 425 or 475 then, i heard somewhere you shoulnt kill the motor with it though, something about leaving fuel in there or something? i forget the details but it was a no-no i thought, i figure it will be an extra safety thing to since i no longer use the smart fly fiber optic kill deal, i had one of those go bad so i took them out of my planes, i figure with a choke i can kill it if the throttle gets messed up, and the ease of starting sounds good, my sd yak i reach in a hole in the cowl with a screw driver to operate choke, and my 110 i ran a choke lever out the bottom of the cowl, i was so proud of how it turned out and how well it works, but i soon realized every time i prime it with choke closed, it drips some fuel on my rod and runs down, so i get fuel on my fingertips everytime i start , i just lick them clean but id like to stop doing that, making me goofy

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RE: Extreme Flight 88" Yak - Build and Fly - 3/14/2009 6:00 AM   
xtraflyr


 

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Status: offline 		What kind of problem did you have with the Smart Fly Kill switch?


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RE: Extreme Flight 88" Yak - Build and Fly - 3/14/2009 6:08 AM   
cjcyclesrc



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quote:

ORIGINAL: diamondave


quote:

ORIGINAL: cjcyclesrc

Dave,

I've used 3004 Futaba's and 475 Hitec's without any problems on the choke. None of my planes have choke servos now but I like having them. I used to always kill my DA50 with the choke and I would start back up on the first flip probably 8 out of 10 times when I go out for another flight.



thanks, i will try a 425 or 475 then, i heard somewhere you shoulnt kill the motor with it though, something about leaving fuel in there or something? i forget the details but it was a no-no i thought, i figure it will be an extra safety thing to since i no longer use the smart fly fiber optic kill deal, i had one of those go bad so i took them out of my planes, i figure with a choke i can kill it if the throttle gets messed up, and the ease of starting sounds good, my sd yak i reach in a hole in the cowl with a screw driver to operate choke, and my 110 i ran a choke lever out the bottom of the cowl, i was so proud of how it turned out and how well it works, but i soon realized every time i prime it with choke closed, it drips some fuel on my rod and runs down, so i get fuel on my fingertips everytime i start , i just lick them clean but id like to stop doing that, making me goofy



I never had any problems with killing it with the choke. You could use the switch on the last flight of the day if you were worried about leaving it wet. I always liked the fact it was already primed for the next start. The ZDZ rear carb would make it more of a pain on the twin.

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RE: Extreme Flight 88" Yak - Build and Fly - 3/14/2009 7:07 AM   
diamondave



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Status: offline 		what would be more of a pain on the twin?

i think it was the cable went bad, the reciever end would light up but i got no led on the ignition side, it was in a plane i had sold, i took it out and set it up in my sdyak, worked initially when i set it up, when i went to the field i had nothing, bypassed it and she fired right up, not sure if it was kinked or split, i even recut the ends and tried again, nothing, so what bothered me was that it woked when i set it up, i didnt do anything different till i got to the field, didnt make sense, but from then on i had that in the back of my head that it can fail, maybe not likely, but it can, so i thought why am i trying to eleminate one problem(throttle linkage or servo going bad) and creating another, so i went back to basics, kISS theory , i have to say it was kind of nice having it no matter how high your idle was taxing back you could cut it off instantly, but now adays i make sure my linkage does it for me

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RE: Extreme Flight 88" Yak - Build and Fly - 3/14/2009 11:24 AM   
cjcyclesrc



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what would be more of a pain on the twin?


Hooking up a manual choke. With my bottom carb DA I just stuck a carbon rod out the bottom front of the cowling where it is easy to get to.


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RE: Extreme Flight 88" Yak - Build and Fly - 3/14/2009 4:24 PM   
Gatorb8


 

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ORIGINAL: diamondave

what would be more of a pain on the twin?

i think it was the cable went bad, the reciever end would light up but i got no led on the ignition side, it was in a plane i had sold, i took it out and set it up in my sdyak, worked initially when i set it up, when i went to the field i had nothing, bypassed it and she fired right up, not sure if it was kinked or split, i even recut the ends and tried again, nothing, so what bothered me was that it woked when i set it up, i didnt do anything different till i got to the field, didnt make sense, but from then on i had that in the back of my head that it can fail, maybe not likely, but it can, so i thought why am i trying to eleminate one problem(throttle linkage or servo going bad) and creating another, so i went back to basics, kISS theory , i have to say it was kind of nice having it no matter how high your idle was taxing back you could cut it off instantly, but now adays i make sure my linkage does it for me


The more I think about it (and you talk about it), the more I like the idea of choke for cut-off versus ignition kill.

If ignition kill fails, engine dies (for sure)
If choke servo fails, I think it would remain in current position (on), I never had a servo fail, would it stay in position or would it search?
anyone know what happens when servos typically fail?

I guess if the engine came loose on the firewall, you loose thr and choke, but if that happens, probably a gonner anyway
Gatorb8

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RE: Extreme Flight 88" Yak - Build and Fly - 3/14/2009 5:49 PM   
diamondave



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Status: offline 		you should grab your engine(prop, hub) once in a while and move it around and see how much it flexes, give you kind of an idea if its loose before that happens

and yes it was kind of a pain to figure out choke on that zdz100, i wanted to come out the front like i saw some others doing with da's, but the carb is directly behind, so i would have to come up, then out, or down, then out, so i had a stroke of genious and put an all thread straight up to the little arm on the bottom of the choke plate, used 2 jam nuts to hole it in place, then put a clevis on the bottom for leverage, now i just twist it, not a pull push, twist ccw closes and cw opens, works great but like i said its messy for me, and its unsupported all the way down through the bottom plate in box, and just short of cowl, i left it short so it wouldnt shake against the cowl, i cut a hole big enough on the bottom for my stubby fingers to reach in and twist, but im sure that thing is vibrating all around during flight and may break at the jam nuts eventually, i just ordered some 475/s, will do my sd and 110, sd 1st cause i am putting a new motor in anyway so nows the time to set it up

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RE: Extreme Flight 88" Yak - Build and Fly - 3/14/2009 5:51 PM   
diamondave



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quote:

ORIGINAL: Gatorb8


quote:

ORIGINAL: diamondave

what would be more of a pain on the twin?

i think it was the cable went bad, the reciever end would light up but i got no led on the ignition side, it was in a plane i had sold, i took it out and set it up in my sdyak, worked initially when i set it up, when i went to the field i had nothing, bypassed it and she fired right up, not sure if it was kinked or split, i even recut the ends and tried again, nothing, so what bothered me was that it woked when i set it up, i didnt do anything different till i got to the field, didnt make sense, but from then on i had that in the back of my head that it can fail, maybe not likely, but it can, so i thought why am i trying to eleminate one problem(throttle linkage or servo going bad) and creating another, so i went back to basics, kISS theory , i have to say it was kind of nice having it no matter how high your idle was taxing back you could cut it off instantly, but now adays i make sure my linkage does it for me


The more I think about it (and you talk about it), the more I like the idea of choke for cut-off versus ignition kill.

If ignition kill fails, engine dies (for sure)
If choke servo fails, I think it would remain in current position (on), I never had a servo fail, would it stay in position or would it search?
anyone know what happens when servos typically fail?

I guess if the engine came loose on the firewall, you loose thr and choke, but if that happens, probably a gonner anyway
Gatorb8


ive stripped gears, but never had a servo itself go bad, im guessing even with stripped or missing teeth, it would still keep the choke in an operating position, since the choke "snaps" open anyway

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