RE: Aviation Models 33% Yak Build Thread

RE: Aviation Models 33% Yak Build Thread
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RE: Aviation Models 33% Yak Build Thread - 6/25/2007 11:14:08 AM

pliebo

Posts: 142
Joined: 6/29/2006
From: sevierville, TN, USA
Status: offline

well I got to maiden mine over the weekend. Had a heck of a time getting the zdz 80 to start, I must have flipped it a hundred times. when I finally got it started, it ran rich but very powerful. the first flights were just taking it easyto get the engine running and trimming etc, when I got warmed up it flew like a dream, so stable and light on the wing. I did some smooth rolling circles, some great knife edge with 0 coupling, perfect,just alot of pattern stuff I can honestly say this is the best flying plane I've ever flown, and it looks so awesome. I can't wait till the engine gets broken in and I can do some 3-d

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IF YOU ONLY HAVE TO BEND OVER ONCE TO PICK UP YOUR PLANE, IT WAS A GOOD LANDING

(in reply to jrjohn)

Post #: 1951

RE: Aviation Models 33% Yak Build Thread - 6/25/2007 1:32:54 PM

JoeAirPort

Posts: 6979
Joined: 8/11/2003
From: Milwaukee, WI, USA
Status: online

I have something that you can try. Both my new ZDZ 50's were a beeotch to start until I did one simple thing: leave the choke on partially for the first start. After it's running a few seconds take the choke off and goose the throttle. Starts the first time every time now. Make sure to have the choke just cracked, almost full choke but enough air that it can keep running rich. It works freeking awesome dude.

quote:

ORIGINAL: pliebo

well I got to maiden mine over the weekend. Had a heck of a time getting the zdz 80 to start, I must have flipped it a hundred times. when I finally got it started, it ran rich but very powerful. the first flights were just taking it easyto get the engine running and trimming etc, when I got warmed up it flew like a dream, so stable and light on the wing. I did some smooth rolling circles, some great knife edge with 0 coupling, perfect,just alot of pattern stuff I can honestly say this is the best flying plane I've ever flown, and it looks so awesome. I can't wait till the engine gets broken in and I can do some 3-d

< Message edited by JoeAirPort -- 6/25/2007 1:33:23 PM >

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Joe AP

(in reply to pliebo)

Post #: 1952

RE: Aviation Models 33% Yak Build Thread - 6/27/2007 12:21:26 AM

pliebo

Posts: 142
Joined: 6/29/2006
From: sevierville, TN, USA
Status: offline

thanks, I'll try that next time, it gets a little easier to start every timeit's only been flown about 5 times so I'm gonna go this weekend and fly the crap out of it!

I've got my choke on a servo so I can just sub trim it to open partially, thanks, phil

_____________________________

IF YOU ONLY HAVE TO BEND OVER ONCE TO PICK UP YOUR PLANE, IT WAS A GOOD LANDING

(in reply to JoeAirPort)

Post #: 1953

RE: Aviation Models 33% Yak Build Thread - 6/27/2007 1:32:11 AM

customjrod

Posts: 17
Joined: 10/12/2004
From: narrows, VA, USA
Status: offline

Ive got the same set up with the same problem. make sure the choke is fully closed, even a little crack will make this thing really hard to start. mine starts on 6th flip now

(in reply to pliebo)

Post #: 1954

RE: Aviation Models 33% Yak Build Thread - 7/2/2007 11:18:43 AM

pliebo

Posts: 142
Joined: 6/29/2006
From: sevierville, TN, USA
Status: offline

I've flown my yak about 6 times now, and love it!, this zdz super 80 is a super pain in the ass though, every time I go to the field it's flip, flip flip, flipflipflip, choke on, choke, off, choke cracked, recommended starting procedure from manual, doesn't matter, it 's just a bear to start, and after I get it going, and after my flight I come in , wait 15 min, then it won't start at all. Maybe my ignition battery isn't large enough , I'm gonn a try a lipo setup with 2100 maand reg, and see if that helps, I hope it gets better when it's fully broken in. I'm just on my second gallon so I'm not too worried yet.

_____________________________

IF YOU ONLY HAVE TO BEND OVER ONCE TO PICK UP YOUR PLANE, IT WAS A GOOD LANDING

(in reply to customjrod)

Post #: 1955

RE: Aviation Models 33% Yak Build Thread - 7/2/2007 11:40:07 AM

Richard D Bahmann aka/Wrongway

Posts: 2017
Joined: 1/7/2004
From: Ormond Beach, FL, USA
Status: offline

Pliebo. I have another manufacturer's engine that gave a similar problem. For me it turned out to be the low end needle was too lean.
Have you tried wide open throttle when choking it for the first time of the day? Please make sure that you have the airplane secured. (best with a friend)
Unless your battery is really small capacity I don't know that it will cause trouble on the start up. Battery capicity will come into play when running full throttle as the more rpm means more sparks discharged in a period of time.
Take a look at this guy's recommendations. I have not tried it yet but do know Pei knows his stuff.
http://www.prme.nl/forum/viewtopic.php?t=10

_____________________________

Gonna kick the tire and light up my
Torch...Gone Flying...WrongWay

(in reply to pliebo)

Post #: 1956

RE: Aviation Models 33% Yak Build Thread - 7/2/2007 1:51:52 PM

NeoGenesis

Posts: 902
Joined: 1/22/2003
From: Findlay, OH, USA
Status: offline

quote:

ORIGINAL: pliebo

I've flown my yak about 6 times now, and love it!, this zdz super 80 is a super pain in the ass though, every time I go to the field it's flip, flip flip, flipflipflip, choke on, choke, off, choke cracked, recommended starting procedure from manual, doesn't matter, it 's just a bear to start, and after I get it going, and after my flight I come in , wait 15 min, then it won't start at all. Maybe my ignition battery isn't large enough , I'm gonn a try a lipo setup with 2100 maand reg, and see if that helps, I hope it gets better when it's fully broken in. I'm just on my second gallon so I'm not too worried yet.

I will reply to this because I just had the same problem over the weekend. I was breaking in a new ZDZ "first time out" and it was doing exactly what you were experiencing. Hard to start....and if it quit or was shut off....you would have to wait for a bit till the engine could be restarted. What I found was that the top end was too rich and the bottom was too lean. I was so frustrated at that point I just reset the needles to factory specs and it runs great now. 1 1/2 turn on the top and bottom. It's good enough to fly for break in and I will slowly tweak them to get the optimal setup. There is one thing to try though. After you shut it off....follow this procedure.

Ignition off
choke off
full throttle
flip the engine 20 to 30 times
leave the choke off
ignition on
it should start within a few flips.

What I found was happening is that upon shutdown the engine was flooding itself and by following the procedure above would help clear it out. But.....since I reset my needles and started from scratch....it starts and runs great now....albeit very rich.

Neo

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Fly it like you stole it!!!!!!!!
Revver Brother #122

(in reply to pliebo)

Post #: 1957

RE: Aviation Models 33% Yak Build Thread - 7/2/2007 4:47:23 PM

pliebo

Posts: 142
Joined: 6/29/2006
From: sevierville, TN, USA
Status: offline

thanks guys that makes me feel better that I'm not the only one.

I think my low needle might be too lean also, I think I'll try the factory settings too. couldn't hurt and at least I can see where I am as opposed to where the factory settings are. I changed my battery to a 2300 ma lipo on a 6v regulator, and we'll see what happens. Phil

_____________________________

IF YOU ONLY HAVE TO BEND OVER ONCE TO PICK UP YOUR PLANE, IT WAS A GOOD LANDING

(in reply to NeoGenesis)

Post #: 1958

RE: Aviation Models 33% Yak Build Thread - 7/2/2007 5:04:21 PM

pliebo

Posts: 142
Joined: 6/29/2006
From: sevierville, TN, USA
Status: offline

okay, I just started it, wasn't too bad this time, I richened my bottom end a little, and within about 20 flips I had it going. man, this thing is a real powerhouse when it runs! thanks for the help, Phil

_____________________________

IF YOU ONLY HAVE TO BEND OVER ONCE TO PICK UP YOUR PLANE, IT WAS A GOOD LANDING

(in reply to pliebo)

Post #: 1959

RE: Aviation Models 33% Yak Build Thread - 7/2/2007 5:20:21 PM

Richard D Bahmann aka/Wrongway

Posts: 2017
Joined: 1/7/2004
From: Ormond Beach, FL, USA
Status: offline

Cool beans!!

_____________________________

Gonna kick the tire and light up my
Torch...Gone Flying...WrongWay

(in reply to pliebo)

Post #: 1960

RE: Aviation Models 33% Yak Build Thread - 7/2/2007 5:59:01 PM

NeoGenesis

Posts: 902
Joined: 1/22/2003
From: Findlay, OH, USA
Status: offline

quote:

ORIGINAL: pliebo

thanks guys that makes me feel better that I'm not the only one. I think my low needle might be too lean also, I think I'll try the factory settings too. couldn't hurt and at least I can see where I am as opposed to where the factory settings are. I changed my battery to a 2300 ma lipo on a 6v regulator, and we'll see what happens. Phil

You said your running a ZDZ RV-J right? You are not supposed to run a regulated pack on that ignition. It is made to accept a 2 cell lith pack directly into it.

I'm glad to hear it's running better, but it still should not take 20 flips to get it running. At a absolute max, 5 to 10 on choke to fire, then no more than 5 to 10 unchoked to run.

Here is the sequence I use to start

Ignition on, choke on
flip till it pops
unchoke
flip till running

This is done with the throttle at a idle setting. I check you needles. How many turn out are you on the top and bottom end?

Neo

_____________________________

Fly it like you stole it!!!!!!!!
Revver Brother #122

(in reply to pliebo)

Post #: 1961

RE: Aviation Models 33% Yak Build Thread - 7/2/2007 11:37:24 PM

pliebo

Posts: 142
Joined: 6/29/2006
From: sevierville, TN, USA
Status: offline

you mean I can run a 2 cell lipo right into the ignition without a reg? I can't find my home made long & skinny screwdriver right now to check my needles but I think I started at factory settings then leaned out about 1/4 turn on each I think it'll get better as I get it broken in more, I think I didn't have enough voltage going into the ignituion, cause I only had a 4.8 volt 1100 ma batt on it.

I'm thinking about doing a smoke system on my yak, I have the pump and my muffler has a smoke fitting on it. has anyone had much experience with this? I need to know how to hook it up.

_____________________________

IF YOU ONLY HAVE TO BEND OVER ONCE TO PICK UP YOUR PLANE, IT WAS A GOOD LANDING

(in reply to NeoGenesis)

Post #: 1962

RE: Aviation Models 33% Yak Build Thread - 7/3/2007 12:53:06 AM

Richard D Bahmann aka/Wrongway

Posts: 2017
Jo