Wren 75 Jubilee
07-13-2012, 12:07 PM
#1
Thread Starter
Wren 75 Jubilee
I've just noticed this on the Wren website and thought it might be of interest to some people here.
Wren 75 (16.5 lbs) thrust engine for £1199
Full specs aren't shown yet but it mentions kerostart so I'm guessing it must be an autostart engine. It looks like a very good deal for a high quality solid performing engine from an established manufacturer.
Wren 75 (16.5 lbs) thrust engine for £1199
Full specs aren't shown yet but it mentions kerostart so I'm guessing it must be an autostart engine. It looks like a very good deal for a high quality solid performing engine from an established manufacturer.
10-05-2012, 03:20 PM
#2
RE: Wren 75 Jubilee
Just opened my new Wren 75 Jubilee, purchased from Ron at Wren USA! Awesome looking little motor. Light weight, compact and 18 pounds of thrust (I've made Ron repeat the final thrust figures until he was blue in the face so I dare not ask him anymore! They originally posted the engine specs saying 16.5 pounds thrust but the production engines are 18#).
Compared to the Supersport or Wren 54: Kero start for one. The kero start plug is relatively small and compact and can be serviced by the owner if they buy a spare plug, without sending the engine in. A nice touch. The engine looks very similar to my older Supersport but the case is ever so slightly different, with an aft rib that looks like it will catch a motor from sliding out of the mount if the owner doesn't tighten it up well enough. The new tailcone is a little different - very similar but it seems slightly more restricted at the outlet. The new ECU is the same one apparently the newer engines have been shipping with, but there is no remote terminal for the Ground Data Unit on the 75 - the Ground Data Terminal unit just plugs into the ECU case with a servo connector vs. phone jack. The EGT wire bracket is much sturdier on the 75 now as well with mounts for the wire front and back so it doesn't deform so easy when handling the engine.
Tubing is pretty easy and the kero start eliminates the gas dilemmas. However, the 75 still retains the gas line but it's blanked off until you had the need to use it with one of their ceramic glow plugs if you wanted to revert back to gas.
"Stated" performance figures look really good:
-Idle Thrust - 0.4 ounces fuel per minute
-Full Thrust - 9.0 ounces fuel per minute
Engine is 34.2 oz.
With everything (including battery) minus fuel and tanks, it's 46 ounces.
-Thrust Figures:
Idle (45K) .66 lbs
50K .77 lbs
60K 1.32 lbs
70K 1.87 lbs
80K 2.64 lbs
90K 3.74 lbs
100K 4.84 lbs
110K 6.38 lbs
120K 7.92 lbs
130K 9.68 lbs
140K 12.1 lbs
150K 15.0 lbs
160K 18.0 lbs
Compared to the Supersport or Wren 54: Kero start for one. The kero start plug is relatively small and compact and can be serviced by the owner if they buy a spare plug, without sending the engine in. A nice touch. The engine looks very similar to my older Supersport but the case is ever so slightly different, with an aft rib that looks like it will catch a motor from sliding out of the mount if the owner doesn't tighten it up well enough. The new tailcone is a little different - very similar but it seems slightly more restricted at the outlet. The new ECU is the same one apparently the newer engines have been shipping with, but there is no remote terminal for the Ground Data Unit on the 75 - the Ground Data Terminal unit just plugs into the ECU case with a servo connector vs. phone jack. The EGT wire bracket is much sturdier on the 75 now as well with mounts for the wire front and back so it doesn't deform so easy when handling the engine.
Tubing is pretty easy and the kero start eliminates the gas dilemmas. However, the 75 still retains the gas line but it's blanked off until you had the need to use it with one of their ceramic glow plugs if you wanted to revert back to gas.
"Stated" performance figures look really good:
-Idle Thrust - 0.4 ounces fuel per minute
-Full Thrust - 9.0 ounces fuel per minute
Engine is 34.2 oz.
With everything (including battery) minus fuel and tanks, it's 46 ounces.
-Thrust Figures:
Idle (45K) .66 lbs
50K .77 lbs
60K 1.32 lbs
70K 1.87 lbs
80K 2.64 lbs
90K 3.74 lbs
100K 4.84 lbs
110K 6.38 lbs
120K 7.92 lbs
130K 9.68 lbs
140K 12.1 lbs
150K 15.0 lbs
160K 18.0 lbs
10-05-2012, 05:25 PM
#4
RE: Wren 75 Jubilee
It replaced my Supersport in the A-4. I wanted kero start and some of the new goodies and I could not resist the trade in for a new engine. I had just re plumbed everything and replaced some of the old components and a couple servo leads and even a servo that I noticed was dodgy after a "extensive" overhaul to get her to better than new condition. What got me going was the need to replace tank lines and rubber fittings and then one thing led to another in the shop!
I've been thinking of making another 18 pound thrust airframe and swapping the Jubilee between two jets with an extra pump and the solenoids staying in for each airframe. The new ECU is pretty easy to swap around so it could make sense "in today's economy"!!
I've been thinking of making another 18 pound thrust airframe and swapping the Jubilee between two jets with an extra pump and the solenoids staying in for each airframe. The new ECU is pretty easy to swap around so it could make sense "in today's economy"!!
