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HomeTurbineAircraftHelicopterTurbine Helicopters › Wren Pump Start Point setting
06-28-2015 06:46 PM  3 years agoPost 21
tgalo

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USA

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Is the video set to Private?

Gravity's a bitch ant it?

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06-28-2015 08:36 PM  3 years agoPost 22
Dan Minick

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Columbus, WI

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Sorry, it always defaults to that and I always forget to switch it. Fixed

Team Synergy, Team FBL Rotors-------if its not broke...it will be!

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06-30-2015 11:28 AM  3 years agoPost 23
MattJen

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UK

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have you done a data download ?

then you will see if it is a pump problem or a blockage somewhere as you will see the pump voltage spike..

All The Best

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06-30-2015 12:16 PM  3 years agoPost 24
Dan Minick

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Columbus, WI

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I have not. Not knowing a ton about why this is happening I was looking for suggestions like yours to start with. Thanks!

Team Synergy, Team FBL Rotors-------if its not broke...it will be!

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06-30-2015 03:40 PM  3 years agoPost 25
Ron Ballard

rrNovice

Decatur, Indiana

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Hello everyone. A few thoughts here.

First:
As always...the first thing I suggest when these failed starts happen is to check or try another battery. Just because the battery was just charged does not insure that the cells are healthy. Just yesterday I had a customer drive 70 miles one way to the shop with his 44 TP because it failed to start...I had asked him to check his batteries...and he claimed all was good. When he arrived, we attempted a start using his battery with a failed start result...I plugged in one of my batteries and the motor started on the first pull...

Second:
The comment regarding a printed manual for the ECU...It is easier to update a PDF for all the world to view...than mail out updated, printed copies to each customer...Gaspar is a very intelligent man and knows that it would be impossible to keep everyone updated using printed material. The internet is used by everyone these days and I am always surprised when customers complain about the task of researching for accurate information using the tools that are readily available through their PC.
Take the time to learn how to navigate through the menus, as this will eliminate a lot of frustrations. I receive a lot of calls in a week...and it is surprising as to how many owners have difficulty in using the Data Terminal.

Third:
The video posted resembles a failed start at switchover...
usually caused by low battery or too low of a Pump Start Point.
My first suggestion would be battery replacement ...and if the problem persists...up the PSP by 2.

Fourth:
Buying and using cheap batteries is one of the biggest culprit here, and in the end, results in no savings at all!!!

Fifth:
We have discovered on rare occasions that the small screws that attach the gas generator to the gearbox can work loose and fall out...resulting in a combustion chamber pressure loss...which causes difficult starting issues...so if your heli has some time on it(vibration), include this on your service check list. It requires a 2mm allen wrench.

I am always available for phone support from 8 am to 8 pm 7 days a week.

260-701-8936

Hope this helps.

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06-30-2015 04:00 PM  3 years agoPost 26
MattJen

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UK

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so if your heli has some time on it(vibration), include this on your service check list. It requires a 2mm allen wrench.

I don't want to question the manufacturer, but if your turbine machine is vibrating enough to make screws come loose on the turbine then surely there is something major going on ???

Have never had a screw come loose on my MW54 with over 200hrs on it. I probably have misread your meaning in your post..

All The Best

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06-30-2015 04:11 PM  3 years agoPost 27
Chris Bergen

rrElite Veteran

cassopolis, MI USA

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Bah, Heli's vibrate sometimes... Blades out of track, tail blades out of balance, bent main shafts, head axles, etc.

He didn't mean the TURBINE was vibrating, but the heli vibrating, which over time can cause screws to come loose.

Chris D. Bergen

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06-30-2015 04:13 PM  3 years agoPost 28
MattJen

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UK

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He didn't mean the TURBINE was vibrating, but the heli vibrating, which over time can cause screws to come loose.

As I said,
I probably have misread your meaning in your post..

small screws that attach the gas generator to the gearbox can work loose and fall out...resulting in a combustion chamber pressure loss

but in fairness vibes strong enough to cause the gear box to minutely open thus releasing pressure, that is some serious vibes... or a poorly setup/built helicopter..

All The Best

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06-30-2015 04:22 PM  3 years agoPost 29
Ron Ballard

rrNovice

Decatur, Indiana

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Matt,

Yes this refers to the heli application...as I have never seen this in the fixed wing TP installs.

The bit of vibration from the rotating blades can over time cause this...just the same as all of the fasteners on the heli that are used for the assembly...we check these on a regular basis, so check the turbine fasteners as well!

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06-30-2015 05:05 PM  3 years agoPost 30
MattJen

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UK

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Yes this refers to the heli application...as I have never seen this in the fixed wing TP installs.

I Just wanted to make it clear for those reading as some may look and not read context and think there is issues with the wren second stage as I have had 3 phone calls in the last 20 mins from panicked flyers thinking their gear boxes are gonna drop off..

for the record, I have put in hundreds of hours on Wrens, and I have never had ANY of the screws come loose, normally you almost round them out when it comes for service and you have to separate the two parts, so how they come apart from vibes is a new thing to me..

All The Best

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06-30-2015 11:43 PM  3 years agoPost 31
Dan Minick

rrKey Veteran

Columbus, WI

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I have 3 identical Thunder Power latest gen (G7?) 2700mah 25c batteries I use for receiver/ starter packs. I rotate these and monitor the cell voltages as I balance. Im quite sure I didn't have 3 lipo packs go bad from one weekend to the next.

I will check the screws you mention.

It just seems odd that I would have to continue to raise the pump voltage even though it has worked good before.

Team Synergy, Team FBL Rotors-------if its not broke...it will be!

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07-01-2015 12:20 AM  3 years agoPost 32
dgoss999

rrApprentice

UK - Lancashire

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Have you tried to run this fuel pump with a short loop of tube full with fuel to see just how free it it.

A typical fuel pump should start to turn at about 0.7/.8 volts and easily run consistently on a single cell Nicad/NiMh battery. (1.2v)

You shouldn't need to keep increasing the start point and ramp speed of a pump once it's set....

/DG

"Believe none of what you hear, and only half of what you see." • Benjamin Franklin

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07-01-2015 01:56 AM  3 years agoPost 33
Dan Minick

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Columbus, WI

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The pump has been working fine. It got less than 4 hours on since brand new. This could be something to pull apart if all else fails

Team Synergy, Team FBL Rotors-------if its not broke...it will be!

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07-06-2015 10:17 AM  3 years agoPost 34
Calil

rrApprentice

Brazil

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Could you please post pictures of your entire system? Do you use felt clunk?

I would like to add that some functions in the INFO menu are only available with the radio off.

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07-06-2015 12:47 PM  3 years agoPost 35
Dan Minick

rrKey Veteran

Columbus, WI

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Please start here------ https://rc.runryder.com/t766315p3/

I am using an OS bubbless clunk as pictured on the last page of the thread.

I was able to get the machine to fire this weekend thanks to Ron at Wren USA and a re read of the manual. I was changing the wrong setting, but when I upped the PSP from factory 32 to the new 45 it fired. If it keeps going the rest of the summer at this setting all will be good. Seems odd that this should change so much all of a sudden. All I can blame it on is the pump breaking in I suppose.

Team Synergy, Team FBL Rotors-------if its not broke...it will be!

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07-06-2015 03:48 PM  3 years agoPost 36
Jim Cimino

rrKey Veteran

NE Pennsylvania

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When I was having the problem with my switchover, I had to keep taking the PSP up to eventually 50. I had no problem for a little while and ended up taking it higher. I talked to Ron and Mike Murphy and we tried a few things that did not help. Mike told me to keep increasing the PSP until it fired. I was concerned because I had to take it to 56, but Mike said that is not a big issue and as long as it was starting and running to do it. After I had a couple more flights on it, I noticed it popping once it switched over, seemed to my untrained ear as being too much fuel so I tried backing the PSP down a little each flight. I am now back to 46 and it is starting fine and no more popping.

Team Synergy, Team Scorpion, No good deed goes unpunished

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07-08-2015 03:27 AM  3 years agoPost 37
Dan Minick

rrKey Veteran

Columbus, WI

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I also got a little popping. Backed it off a bit and its working good. Need more fuel now!

Team Synergy, Team FBL Rotors-------if its not broke...it will be!

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07-15-2015 04:54 PM  3 years agoPost 38
Jim Cimino

rrKey Veteran

NE Pennsylvania

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I am still a little concerned. As I mentioned I was able to lower my pump start point to 46, didn't fly it for about a week and had to take it back up to 55 to get it to start. I have not had any running problems once it starts, but wonder why this keeps changing.

Team Synergy, Team Scorpion, No good deed goes unpunished

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07-15-2015 05:08 PM  3 years agoPost 39
dgoss999

rrApprentice

UK - Lancashire

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Check this one out..

http://www.helifreak.com/showthread.php?t=703038

I'm not sure if it relates to your issue.

DG

"Believe none of what you hear, and only half of what you see." • Benjamin Franklin

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09-14-2015 03:23 PM  3 years agoPost 40
Jim Cimino

rrKey Veteran

NE Pennsylvania

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Update...Ron sent me a new fuel pump and I installed it. I left the pump start point where it was at (56) and tried it, it was a very hot start. I have been lowering the pump start point since and am currently down to 37 with very clean starts. I am going to take it down a little more and try it and once I establish where it starts well and clean I will let it sit for a week and see what happens. I think the new pump is going to be the fix I needed. Ron is still the best!

Team Synergy, Team Scorpion, No good deed goes unpunished

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HomeTurbineAircraftHelicopterTurbine Helicopters › Wren Pump Start Point setting
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