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Merlin Turbine support forum now open

Old 05-17-2005, 08:52 AM
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mvigod
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Default Merlin Turbine support forum now open

Support for the Merline turbines will be provided here in this forum. Post your questions here and Todd Witkoff of DreamworksRC.com will field them.
Old 12-08-2005, 12:39 AM
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Default RE: Merlin Turbine support forum now open

I have a problem. When i start my merlin (new 160) it throws out flames as the engine ramps up.

Is this, what is commonly referred to as a hot start.

The pump start ramp is set at 3 and the pump start point is set at auto-8

The flames only occur during start ups and then clear up with in 5 - 10 seconds

looking for help
Old 12-08-2005, 09:31 AM
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Default RE: Merlin Turbine support forum now open

From your description, It sounds like the propane pulse rate may be a bit too high. Are you using Powermax or Propane for your starting gas?
Give me a call @ 386-852-4793 and I can walk you through the propane volume adjustment.
Todd
Old 12-08-2005, 01:05 PM
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Default RE: Merlin Turbine support forum now open

I have had my Merlin for over a year and initialy it also through such a huge flame that in nearly destroyed my Euro Sport Typhoon, the gas tank is massive and if mounted horizontally in the fuselage you'll be gettting lots and lots of liquid propane and hardly any gas even if you adjust the flow.My friend suggested that we mount it verticaly and bingo probem solved instantly .It had been orking reliably ever since, try it and see!![8D]

[sm=drowning.gif]
Old 12-11-2005, 07:36 PM
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Default RE: Merlin Turbine support forum now open

well got rid of the flames on start up. tried turning down the propane, but it didn't correct the problem.

we then delayed the pump start up time and reduced the pump ramp time. no more flames or kerosene spitting out the engine.

unfortunately, that was only one of our problems.

Truthfully. about ready to throw the engine in the trash.

the other problem that we have is the inconsistancy of the engine.

this morning we started the engine three times in a row and this is what happened:

1. The first time it ran and and spooled up to maximum rpms no problem. thought all was ok.

2. The second startxt start. engine fires up idles no problem. But shuts down as i advanced the throttle (about 3/4) Puff of white smoke.

3.The third time it starts accelerates to full throttle was cycled twice between idle and 100% then the engine started to burn funny- throwing out a 3 -4 foot blue and yellow flame,. the rpms were fluctuating between 24 and 34 thousand rpms. I shut the engine down when i saw the end cone start to glow red.

One of the problems is that so much is happending it is difficult to keep track of all the rapidly fluctuating numbers. Therefore, it is somewhat difficult to give the techs all the correct info so that they can help with the diagnosis.

just a though perhaps i will try and remove the data box from the plane once it says running. perhaps it giving off some interference. Hey, willing to try anythig at this point.

This engine is about three bad starts from the hammer an trash. NO JOKE

For the record, the engine starts up and idles lovely. if we could just get the plane to take off and land at idle i wouldn't be so angry.

P.S. the techs are great, in that, they are extemely helpful and have offered tons of advice.

by the way, we operate at sea level. (the highest point in bermuda is 375 feet above sea level)
todays weather

hi - 71 degrees F
lo - 62 degrees F
barometric pressure 1013mb (29.94")
humidity 94 percent

perhaps this will help
Old 12-12-2005, 11:51 AM
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Default RE: Merlin Turbine support forum now open

started the engine this morning - ramped up to idle no problems.

applied throttle slowly, the engine began to accellerate and then started to burn funny, blue and yellow flames coming out the end cone. the engine rpms fell and began fluctuating between around 24000 - 26000. the end cone started to turn red.

at the time exhaust temperature droped down to around 480 degrees and the pump Pw reading said 286

i shut down the engine by turning off the fuel

at start up the the exhaust temp. read 24 degrees

prior to running engine made reccommended changes to the various parameters as laid out by gasper and increased to the accelleration delay.

started the engine a second time and the same problem occured.

is it normal to have soooooo muuuuch trouble dialing i a turbine, or is it just the merlin.

at least it looks impressive.[:@][>:][>:][]
Old 12-12-2005, 11:25 PM
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Default RE: Merlin Turbine support forum now open

Your fluctuations and innability to accelerate are most likely from a sticky fuel pump. Tailcone got hot as the rpms fell below the minimums for the engine to sustain combustion.
Both problems you describe are most likely related to the bad pump, I'll let you know what I find as soon as we get the engine back for inspection.
Regards,
Todd
Old 12-13-2005, 10:14 PM
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Default RE: Merlin Turbine support forum now open

For the record, so far we have received first class service from the merlin support staff. Hopefully a replacement pump will rectify the problem.

Now that there is light at the end of the tunnel, I am once again looking forward to seeing this beast in action. Just imagine 38 pounds of thrust on a 12 pound enforcer.

peace and luv
Old 12-16-2005, 07:12 AM
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Default RE: Merlin Turbine support forum now open

well, we heard back from Todd today, the engine appears to be working fine on the test bench. He is of the belief that, our fuel supply system may not be flowing suffient volumes of fuel.

Inorder to test his theory, I'm gonna build a test bench with a new uav, tanks and hoses.

I'll post the results.

On another note, i just thought i would say hi to the fellas that are keeping track of the post (chat,the sherrif,woodley, and frank.


we will be back. just watch the skies. don't blink u might miss it.
Old 12-16-2005, 10:36 PM
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Default RE: Merlin Turbine support forum now open

Derek,
I Have performed several runs on your engine, I can confirm the problem you where experinceing is not within the engine or ancillary components. Your Merlin runs perfectly in our test stand. As you can see from the image below, a graph was created from your Fadec Data before I began testing your engine. From the graph, we can see you throttle command rising, fuel pump command rising but temps and RPM dropping. This is a classic example of inadequate or restricted fuel supply to the pump. We see this same pattern over several of your runs. I suggest a through check of the aircraft fuel system. Test runs on the stand will confirm your engine is running correctly.
Your engine is on it's way back to you now...
Regards,
Todd
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Old 12-16-2005, 11:37 PM
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Default RE: Merlin Turbine support forum now open

Nice job Todd [sm=thumbup.gif]

First class service!
Old 12-17-2005, 08:17 AM
  #12  
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Default RE: Merlin Turbine support forum now open

Good day Todd,

I would like to take the opportunity to thank you for all of your time and patience.

On another note, i was wondering if it was possible for you to post a graph-taken from an engine that is operating correctly.

This would serve as referrence guide for when we check the engine data in the future.

Thanks



Old 12-17-2005, 09:59 AM
  #13  
jetway
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Default RE: Merlin Turbine support forum now open

Hello Todd,
I would also like to thank you for your time and patience.
Irvin and i figured it would be best to send the motor up
to you rather then have everyone here poking with the
motor.We would go through the system on this end as
WE would like to understand the whole operation of the
system ourselves motor & etc.
Great Service.
Jetway.[8D]
Old 12-19-2005, 02:04 PM
  #14  
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Default RE: Merlin Turbine support forum now open

ORIGINAL: AFFORDABLEPARTY

Good day Todd,

I would like to take the opportunity to thank you for all of your time and patience.

On another note, i was wondering if it was possible for you to post a graph-taken from an engine that is operating correctly.

This would serve as referrence guide for when we check the engine data in the future.

Thanks
Well, Since I sent your engine back and did not dowload the data before sending it, I am just pulling data here from another ecu I have on hand. This chart looks fairly typical of a "Normal" run, meaning all systems are working correctly. I do notice from this file that the temps are a bit higher than normal (for a Merlin) on this run, most likely due to the TC being inserted too deep in the nozzle. But... Should give you a good idea what a normal run would look like.
Todd
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Old 12-21-2005, 10:42 PM
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jetway
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Default RE: Merlin Turbine support forum now open

Call me stupid. I am beginning to feel that that's the case. Everyone else can get the engine to run but me.

Used a brand new bvm tank, uav and hoses. We started the engine three times.

First start - engine roared to life. cycled the enging between full and idle several times-what a beast. Then all of a sudden, the engine started to burn funny again-throwing flames out the end cone. After a few seconds we shut it down.

Second start, removed the filter to see wether or not it was causing the restriction of fuel flow. Engine roared to life, started to accelerate to full throttle and the engine began burning funny again. shut it down.

third start, we decided to use a different batch of fuel. Once again engine roared to life, idled no problem. started to accellerate to full throttle then all of a sudden the engine shut down. (no puff of white smoke)

just about had it with this engine.

i suppose it is probably something simple.

well they say stick with what u know works.

to add insult to injury, thought i would review the data using our fancy software. once again i must be stupid, a message comes up windows cannot open the file because it didn't know what progam was used to create the file.

talk about leaving a bad taste in your mouth. Just can't seem to get a break.


stupid[:@][:@][:@][:@][:@][:@][:@][:@][:@][:@][:@][:@][:@][:@][:@]

Just checked the cause of the last shut down on the data terminal and the readings were

rpm -30000
temp -432 c
pw -340
cause for shut down says Failsafe

Now that i know the cause for the last shut down, i'll try one more time with new batch of fuel. tomorrow.
Old 12-22-2005, 12:41 AM
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Default RE: Merlin Turbine support forum now open

todd, what program do need,r to open up the software on the disk?
[]
Old 12-22-2005, 08:44 AM
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Default RE: Merlin Turbine support forum now open

Derek,
Sounds like you have possibly found the source of the problems (bad fuel, radio issues). I am confident there is nothing wrong with the engine, I put several runs on it and it performed perfectly. Please take the time to review your manual completely, charge the batteries and start with some fresh fuel. I think once you work through these user induced issues, you will be quite happy with your engine.
The FADEC software is just an executable file, just click on the FADV36.exe file to run the software. If you are unable to run this software for some reason, it can also be downloaded here:
http://dreamworksrc.com/Fadec/Fadv3.zip

Let me know if I can be of any further assistance.
Todd
Old 12-23-2005, 11:51 AM
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Default RE: Merlin Turbine support forum now open

Derek,
From the data file you sent me, I will assume you got the software and engine running correctly

Here's a graphed portion of your last run, Lookin good!



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Old 12-23-2005, 02:42 PM
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Default RE: Merlin Turbine support forum now open

Merlin Merlin Merlin


Well, it would appear that a bad batch of fuel was the problem.

started the engine twice this afternoon, and was able to run the main tank dry.

thank you tood and thank you gasper for all of your patience.


We do appologise for any negative effects that our post may have caused.

Fire in the hole
Old 12-23-2005, 03:26 PM
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Default RE: Merlin Turbine support forum now open

Hey Todd,

how do you get the data displayed as per lyour last post.

Unfortunately, we can only display it in its most basic form.





Old 12-29-2005, 06:28 PM
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Default RE: Merlin Turbine support forum now open

Merlin MK2,
Well we put the Merlin back in the Jet today after doing
a few bench test. It was definitely a batch of bad fuel we
had even though it was fresh from the filling station. We
dumped it and got another fresh batch of fuel from a different
filling station. Test ran it no problems put the motor back
in the jet fired it up and no problems. We were able to run
a full tank through it with out it shutting down like it was doing
before. I would like to thank Todd and Gasper for all your
support. [sm=thumbup.gif]
Jetway.
Old 12-31-2005, 08:27 PM
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Default RE: Merlin Turbine support forum now open

I have fallen in love with the merlin. sweet running engine. excellent , smooth, throttle response. did i say i love this engine.

great job gasper. excellent service todd
Old 05-25-2006, 09:33 AM
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Default RE: Merlin Turbine support forum now open



HI! Mr Todd Sir,

I would like to find out from the merlin 160 MKII what is the spool up time response from idle to full throttle thank you sir.

X-Spec( James )
Old 05-31-2006, 07:53 AM
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Default RE: Merlin Turbine support forum now open

Sorry for the delay James, Did not notice this post till today....

Idle to full throttle is roughly 3 seconds, anything above 60K is instantaneous..... One of the fastest on the market.
Todd
Old 05-07-2007, 11:43 AM
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Default RE: Merlin Turbine support forum now open

Todd,

This is a question I should have asked back in November. Should I do anything to my engine before it sits in the garage all winter long? I did start it 2 days ago with no issues to note.

Robert

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