OS 1.60 & Perry VP 30 Pump Issue

OS 1.60 & Perry VP 30 Pump Issue
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OS 1.60 & Perry VP 30 Pump Issue - 7/7/2008 12:05:28 AM

maineflyer

Posts: 537
Joined: 1/26/2002
From: Caribou, ME, USA
Status: offline

Guys,
I have a 1.60 and perry VP-30 on it. The motor has about 7-9 tanks through it. I have the idle dialed in fairly well and the high end is taching a APC 18-6W at 9,000 with great smoke and am idling at 2,300-2,400. I could probably get a little more from the high end but am not pushing for a lean run. I have an OS A-5 plug and am running 10% fuel. The problem I am having is an inconsistant mid-range. I can idle on the bench for a minute and get instant transition to full throttle but in the air there is sometimes a warble in mid-range and I am seeing some lag in transition it seems. I am wondering if I am a tad to lean on the low end as I have had a dead stick with it and the lagging. I don't dare get too low with the Yak it is on as I don't want a 20' dead stick.

Any thoughts on how to dial this in would be appreciated.

Thanks
Jeff

Post #: 1

RE: OS 1.60 & Perry VP 30 Pump Issue - 7/7/2008 12:42:38 AM

Sport_Pilot

Posts: 7600
Joined: 1/21/2002
From: Acworth, GA, USA
Status: offline

You are probably a bit rich on midrange from the pump pressure. You need to reduce pump pressure per the instructions.

(in reply to maineflyer)

Post #: 2

RE: OS 1.60 & Perry VP 30 Pump Issue - 7/7/2008 8:13:55 AM

Flyer95

Posts: 957
Joined: 9/21/2004
From: STOCKHOLM Akersberga, SWEDEN
Status: offline

What Sport_Pilot said and a OS-F glow plug should solve the rich midrange and give you instant acceleration. OS-F plug is my favourite glowplug for the large twostrokes.

(in reply to maineflyer)

Post #: 3

RE: OS 1.60 & Perry VP 30 Pump Issue - 7/7/2008 11:02:04 AM

maineflyer

Posts: 537
Joined: 1/26/2002
From: Caribou, ME, USA
Status: offline

Thanks guys, I appreciate the imput.
Jeff

(in reply to Flyer95)

Post #: 4

RE: OS 1.60 & Perry VP 30 Pump Issue - 7/24/2008 2:16:17 AM

nitrobeast

Posts: 351
Joined: 10/31/2005
From: , NJ, USA
Status: offline

quote:

ORIGINAL: maineflyer

Thanks guys, I appreciate the imput.
Jeff

Hey there main..
Im finally getting back to my yak. I also need some help with my pump and 1.60. Any tips on how to tune this thing? I never used a pump before and really dont know where to begin.

Thanks

(in reply to maineflyer)

Post #: 5

RE: OS 1.60 & Perry VP 30 Pump Issue - 7/24/2008 3:00:42 AM

maineflyer

Posts: 537
Joined: 1/26/2002
From: Caribou, ME, USA
Status: offline

Nitro,
This is where I would go to get some info.

http://www.rcaerobats.net/OS160_Setup.htm

Jeff

(in reply to nitrobeast)

Post #: 6

RE: OS 1.60 & Perry VP 30 Pump Issue - 7/24/2008 12:13:34 PM

nitrobeast

Posts: 351
Joined: 10/31/2005
From: , NJ, USA
Status: offline

quote:

ORIGINAL: maineflyer

Nitro,
This is where I would go to get some info.

http://www.rcaerobats.net/OS160_Setup.htm

Jeff

Jeff,
I saw that yesterday while looking for some info. thanks..The stock low niddle setting is 2 1/2 turns out. The info says to turn it in 2 turns from factory...Can that really be??

I got my pump used when i bought the 1.60. Can you tell me how far the screw should be out from flush? Basically im trying to get it to factory setting again.

This might be a dumb question but how do you set the tank up for use with a pump?
Thanks

< Message edited by nitrobeast -- 7/24/2008 12:31:13 PM >

(in reply to maineflyer)

Post #: 7

RE: OS 1.60 & Perry VP 30 Pump Issue - 7/24/2008 12:54:43 PM

Sport_Pilot

Posts: 7600
Joined: 1/21/2002
From: Acworth, GA, USA
Status: offline

quote:

I saw that yesterday while looking for some info. thanks..The stock low niddle setting is 2 1/2 turns out. The info says to turn it in 2 turns from factory...Can that really be??

Yes. But if you have to turn it that far in the midrange may be rich, that is why I recomended adjusting the pressure. The correct setting should only be at or slightly above what it would be with muffler pressure.

(in reply to nitrobeast)

Post #: 8

RE: OS 1.60 & Perry VP 30 Pump Issue - 7/24/2008 12:57:52 PM

maineflyer

Posts: 537
Joined: 1/26/2002
From: Caribou, ME, USA
Status: offline

Nitro,
Here is what I did. I used a 3 line set up for the tank and tapped and drilled the back plate of the engine for the pump. The engine likes to run lean so get it started and get the high end set then go to idle. let it idle for a minute if it holds idle then stop the engine and turn the low end screw in 1/2 turn. Keep doing this (High end set and then going to idle) until the engine won't idle and dies from being too lean. Then back the screw out to richen the idle by a quarter turn until it will hold a nice idle. Then repeat the proceedure (high end and idle) and fine tune your adjustments to your liking. You should get a fairly good transition but will most likely still be rick in midrange. I ran 4-5 tanks like this and then backed the pressure down on the pump by 1/2 turn and then repeated it all again. This will help with the transition. During the first part my high end was maybe 1 to 1 1/2 turns out and low end was about the same. Hope this helps. BTW I could get it to run great on the bench but it still was a little heavy through midrange in the air. I am flying it like this now for the first gallon then I will play with it and see if I can get it a tad better. The engine takes tile to unwind on the low end at ilde so give yourself plenty of room bringing it in for landings. I have to take the plane on a longer downwind to get the engine to get down to idle before I turn to base and final on approach. PM me if you have any questions. I did get a little video of the Yak, my wife shot it on our digital camera and it is very shakey and low quality. I think you will like the combo once the engine get running good. I would keep teh plane fairly high at first to avoid the dreaded dead sticks until the engine hits its stride.
Jeff

< Message edited by maineflyer -- 7/24/2008 1:02:24 PM >

(in reply to nitrobeast)

Post #: 9

RE: OS 1.60 & Perry VP 30 Pump Issue - 7/26/2008 5:02:14 AM

maukaonyx

Posts: 125
Joined: 10/7/2006
From: salem, OR, USA
Status: offline

quote:

ORIGINAL: nitrobeast

quote:

ORIGINAL: maineflyer

Nitro,
This is where I would go to get some info.

http://www.rcaerobats.net/OS160_Setup.htm

Jeff

Jeff,
I saw that yesterday while looking for some info. thanks..The stock low niddle setting is 2 1/2 turns out. The info says to turn it in 2 turns from factory...Can that really be??

I got my pump used when i bought the 1.60. Can you tell me how far the screw should be out from flush? Basically im trying to get it to factory setting again.

This might be a dumb question but how do you set the tank up for use with a pump?
Thanks

I'm running the OS160 and Perry VP-30 in a CMP Giles 202. Really only have one maiden flight on it so far, but it ran sweet that one flight. My needle is just over one turn open. This is consistent with other threads I remember reading here on RCU that the the needle needs to be closed much more than without the pump. Good luck. Jon

(in reply to nitrobeast)

Post #: 10

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