Wren 100
#2
My Feedback: (4)
RE: Wren 100
The numbers are just fantastic on this Wren 100. 22 pounds of thrust on the same weight as a Supersport. The thing that impresses me most about my Supersport is the miserly fuel burn, however, at the thrust it's putting out. No favors are made with a small can, big thrust engine when we have to carry gallons of fuel to feed an overly thirsty engine. Sure, much of the math in thrust generation is converting fuel to efflux energy but its nice to have an efficient system to start with. I hope the Wren 100 is as good on fuel burn as the Supersport (I bet it's pretty good).
Nice job guys! Looking forward to hearing and seeing this engine in person some day soon.
Nice job guys! Looking forward to hearing and seeing this engine in person some day soon.
#3
Thread Starter
My Feedback: (50)
RE: Wren 100
ORIGINAL: Eddie P
The numbers are just fantastic on this Wren 100. 22 pounds of thrust on the same weight as a Supersport. The thing that impresses me most about my Supersport is the miserly fuel burn, however, at the thrust it's putting out. No favors are made with a small can, big thrust engine when we have to carry gallons of fuel to feed an overly thirsty engine. Sure, much of the math in thrust generation is converting fuel to efflux energy but its nice to have an efficient system to start with. I hope the Wren 100 is as good on fuel burn as the Supersport (I bet it's pretty good).
Nice job guys! Looking forward to hearing and seeing this engine in person some day soon.
The numbers are just fantastic on this Wren 100. 22 pounds of thrust on the same weight as a Supersport. The thing that impresses me most about my Supersport is the miserly fuel burn, however, at the thrust it's putting out. No favors are made with a small can, big thrust engine when we have to carry gallons of fuel to feed an overly thirsty engine. Sure, much of the math in thrust generation is converting fuel to efflux energy but its nice to have an efficient system to start with. I hope the Wren 100 is as good on fuel burn as the Supersport (I bet it's pretty good).
Nice job guys! Looking forward to hearing and seeing this engine in person some day soon.
"Results from fuel tests:
Conditions:
29.44 pressure
32.5 dew point
800 ASL
72 F.
5% Mobile DTE light in kero
160,000 RPM
12 ounces / min
52psi fuel pressure
740 C.
21.1 pounds thrust
130,000 RPM
7.75 ounces / min
30psi fuel pressure
558 C.
11.2 pounds thrust
110,000 RPM
5.5 ounces / min
18psi fuel pressure
510 C.
7.1 pounds thrust
These tests were performed during our open house 10-16-2010 by the guests, and witnessed by all in attendance."
I do think this motor will be winner.
#4
Thread Starter
My Feedback: (50)
RE: Wren 100
Here are some more photos. Then plan is to sell Gold in photo and purchase either JMP Hustler or Comp-Arf Flash for this engine. Leaning torward Hustler do to fact JMP is only 25 minutes away and thinking a Hustler would fun with this small little power house. The only thing missing is engine mounting straps. Ron has them on way to me. Hoping to run this weekend and post video. Engine could go on Nano until Hustler is purchased.
#6
RE: Wren 100
I was on the controls for those consumption tests...we used a 3300MAH battery for the fuel pump. I would suggest a good strong lipo because you are making over 50psi on the pump. that will take some power. what we didn't do was check the current at WOT, but will try to do that sometime soon. And yes, for those that ask, its the flightworks 200 pump and a Xicoy ECU. Its a very sweet setup. the Xicoy can run the new Wren mini plug, which works excellent. Very positive starts.. better than any standard glow plug I have ever seen.
Its an outstanding successor to the super sport. It should power any 20lb class model and save you weight , fuel weight, and such...
thanks for letting us play with the new motor Ron!! you have a winner here..
Its an outstanding successor to the super sport. It should power any 20lb class model and save you weight , fuel weight, and such...
thanks for letting us play with the new motor Ron!! you have a winner here..
#9
RE: Wren 100
ORIGINAL: joeflyer
Did Wren upsize the fuel line from 3 mm. to 4 mm. when going from the Supersport to the 100? It seems that would be a better way to go than over stressing the fuel pump.
Did Wren upsize the fuel line from 3 mm. to 4 mm. when going from the Supersport to the 100? It seems that would be a better way to go than over stressing the fuel pump.
#10
My Feedback: (1)
Join Date: Dec 2002
Location: Co. Donegal, IRELAND
Posts: 2,760
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RE: Wren 100
Yes seen that on the wren 160 in the Airworld L39 I was working on recently, there must be a reason why wren stay with 3mm pipe, 4mm is much easier for fitting to valves, pumps filters etc. I tend to do everything with 4mm then change to 3mm just beofre the turbine.
#11
RE: Wren 100
ORIGINAL: Xairflyer
There must be a reason why wren stay with 3mm pipe.
There must be a reason why wren stay with 3mm pipe.
Mike
#13
My Feedback: (39)
Join Date: Jan 2003
Location: Decatur, IN
Posts: 1,284
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RE: Wren 100
We actually did build a Wren 160 with all 4 mm piping....absolutely no difference in performance. So is there really a need to change the 100. If 4mm is better for your application, use it up to the motor...then use a 4mm to 3mm reducer Festo to connect.
As for Bald Eagle....I have come to expect his expert knowledge and free input on all things pertaining to our motors. Kinda funny sometimes, but more time than not ....just sadness!!
Gee Mike, maybe you should start your own turbine manufacturing company...you make it sound so easy!!
As for Bald Eagle....I have come to expect his expert knowledge and free input on all things pertaining to our motors. Kinda funny sometimes, but more time than not ....just sadness!!
Gee Mike, maybe you should start your own turbine manufacturing company...you make it sound so easy!!
#14
My Feedback: (39)
RE: Wren 100
ORIGINAL: joeflyer
Did Wren upsize the fuel line from 3 mm. to 4 mm. when going from the Supersport to the 100? It seems that would be a better way to go than over stressing the fuel pump.
Did Wren upsize the fuel line from 3 mm. to 4 mm. when going from the Supersport to the 100? It seems that would be a better way to go than over stressing the fuel pump.
PaulD
#15
My Feedback: (1)
Join Date: Dec 2002
Location: Co. Donegal, IRELAND
Posts: 2,760
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RE: Wren 100
ORIGINAL: Wren Turbines USA
We actually did build a Wren 160 with all 4 mm piping....absolutely no difference in performance. So is there really a need to change the 100. If 4mm is better for your application, use it up to the motor...then use a 4mm to 3mm reducer Festo to connect.
As for Bald Eagle....I have come to expect his expert knowledge and free input on all things pertaining to our motors. Kinda funny sometimes, but more time than not ....just sadness!!
Gee Mike, maybe you should start your own turbine manufacturing company...you make it sound so easy!!
We actually did build a Wren 160 with all 4 mm piping....absolutely no difference in performance. So is there really a need to change the 100. If 4mm is better for your application, use it up to the motor...then use a 4mm to 3mm reducer Festo to connect.
As for Bald Eagle....I have come to expect his expert knowledge and free input on all things pertaining to our motors. Kinda funny sometimes, but more time than not ....just sadness!!
Gee Mike, maybe you should start your own turbine manufacturing company...you make it sound so easy!!
#16
My Feedback: (48)
RE: Wren 100
I'm sure 95% of the fuel pressure comes from the pressure drop thru the needles in the fuel rail.
3 or 4mm line in a turbine this size will make no difference at all.
I have confidence in Wren and their engineering capability. At some fuel flow rate it makes more sense to upsize the lines. My guess is that they are getting close to that point with a 22# engine.
Joe
#17
RE: Wren 100
ORIGINAL: Couch Potato
Mike,
With all this bad karma you keep spouting re Wren, you're due for the mother of all wet starts with your kero start turbines.
Mike,
With all this bad karma you keep spouting re Wren, you're due for the mother of all wet starts with your kero start turbines.
Mike
#18
RE: Wren 100
ORIGINAL: Wren Turbines USA
Gee Mike, maybe you should start your own turbine manufacturing company...you make it sound so easy!!
Gee Mike, maybe you should start your own turbine manufacturing company...you make it sound so easy!!
Back in October 2007 I contacted Sarah Parish about the availability of the Kero start on Wren turbines I was told that Wren had it working and it just needed a software update, I wanted to buy British, but I wanted Kero start, I am still waiting, and you are supprised I am a little bit peeved.
Mike
#20
My Feedback: (14)
RE: Wren 100
Just did the first flight on my Wren 100, replaced the SuperSport on my BTE Reaction 54. Report over on that thread .. but the one word summary is: "SUPERB!"
:-)
Dave
See: [link=http://www.rcuniverse.com/forum/fb.asp?m=10089038]http://www.rcuniverse.com/forum/fb.asp?m=10089038[/link]
:-)
Dave
See: [link=http://www.rcuniverse.com/forum/fb.asp?m=10089038]http://www.rcuniverse.com/forum/fb.asp?m=10089038[/link]
#22
RE: Wren 100
ORIGINAL: joeflyer
Did Wren upsize the fuel line from 3 mm. to 4 mm. when going from the Supersport to the 100? It seems that would be a better way to go than over stressing the fuel pump.
Did Wren upsize the fuel line from 3 mm. to 4 mm. when going from the Supersport to the 100? It seems that would be a better way to go than over stressing the fuel pump.
The motors I have seen run on the test stand at Rons at WOT, most all of them have a good high fuel pressure. That gives good atomization. Everything in a turbine is a balance. You want a good high fuel pressure but it cannot zap the battery. When I ran the SS/fltworks last time at 48PSI fuel pump, it was pulling 4 amps from the battery.. . The flightworks 200 pump is up to the task in the 100, as is the 400 in the 160. I was pretty darned impressed at this new setup.
When we ran volt/current tests last year at this time, the smaller motors pulled around 10 amps on start (propane start), less than 1/2 amp at idle and 4 amps at WOT. the Wren 160 was roughly double that, and both made 48+ psi pump pressure. During development of 160, Mike told us he opened up the nozzle just a tiny bit to achieve that balance of pressure and power consumption. I was very impressed at the work that was put into the development BEFORE it ever hit the streets...
The motors start nicely, run very well, are very reliable, and keep running.. the 100 is going to be an excellent "small block" motor for anyone that wants to keep it light with 20+lb thrust.. thats alot of planes!!
#23
RE: Wren 100
ORIGINAL: craigdyer
BooHoo Bald Eagle,Grow up and build a bridge, If you ain't got nuthin nice to say dont say anything at all.
BooHoo Bald Eagle,Grow up and build a bridge, If you ain't got nuthin nice to say dont say anything at all.
Mike
#24
My Feedback: (4)
RE: Wren 100
ORIGINAL: ww2birds
Just did the first flight on my Wren 100, replaced the SuperSport on my BTE Reaction 54. Report over on that thread .. but the one word summary is: ''SUPERB!''
:-)
Dave
See: [link=http://www.rcuniverse.com/forum/fb.asp?m=10089038]http://www.rcuniverse.com/forum/fb.asp?m=10089038[/link]
Just did the first flight on my Wren 100, replaced the SuperSport on my BTE Reaction 54. Report over on that thread .. but the one word summary is: ''SUPERB!''
:-)
Dave
See: [link=http://www.rcuniverse.com/forum/fb.asp?m=10089038]http://www.rcuniverse.com/forum/fb.asp?m=10089038[/link]
#25
Join Date: Oct 2002
Location: Leeds, UNITED KINGDOM
Posts: 1,449
Likes: 0
Received 11 Likes
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8 Posts
RE: Wren 100
Well here is some free information and rather good in my opinion. My normally superb Supersport started to stick on the first start up of the day. Not a huge problem as once it was free (application of a finger) it ran as normal. Nonetheless I dropped it back for them to take a look at. They told me that the engine was serial No.1 and had an ali shaft tunnel. Later engines had a SS shaft tunnel. It also had rear preload. So they have brought it up to the latest standard for me and now it is outputting out 8.4 kgs of thrust, certainly more than before.
And the cost? Zilch! Nix! Not a penny!
Once again I have to say: Thank you Wren!
And the cost? Zilch! Nix! Not a penny!
Once again I have to say: Thank you Wren!