Reaction 54 Jet Kit
07-03-2018, 12:11 PM
#4102
N99JH
I looked at the 80 oz fuel tank install, it is possible as we can see it on joeflyer's picture ( thank you Joe for posting that pic ) he is keeping 2/3 of the fuel tank forward from the CG point, doing so it will keep the airplane under a manageable CG during the flight.
Art ARRO mention a key element here, I'm too far in the building to be doing that kind of mods ( lots of work ).
I will continue with the original mod plan for the fuel system on this Reaction ( I have ordered 3 more for the next batch ) those will see a little more mods when they get build.
Thank you for your tip Joshua
I looked at the 80 oz fuel tank install, it is possible as we can see it on joeflyer's picture ( thank you Joe for posting that pic ) he is keeping 2/3 of the fuel tank forward from the CG point, doing so it will keep the airplane under a manageable CG during the flight.
Art ARRO mention a key element here, I'm too far in the building to be doing that kind of mods ( lots of work ).
I will continue with the original mod plan for the fuel system on this Reaction ( I have ordered 3 more for the next batch ) those will see a little more mods when they get build.
Thank you for your tip Joshua
Last edited by CARS II; 07-03-2018 at 12:19 PM.
07-03-2018, 12:11 PM
#4103
N99JH
I looked at the 80 oz fuel tank install, it is possible as we can see it on joeflyer's picture ( thank you Joe for posting that pic ) he is keeping 2/3 of the fuel tank forward from the CG point, doing so it will keep the airplane under a manageable CG during the flight.
Art ARRO mention a key element here, I'm too far into the building to be doing that kind of mods ( lots of work ).
I will continue with the original mod plan for the fuel system on this Reaction ( I have ordered 3 more for the next batch ) those will see a little more mods when they get build.
Thank you for your tip
Last edited by CARS II; 07-03-2018 at 12:15 PM.
07-03-2018, 12:37 PM
#4104
JS
You probably are using a turbine like the M100XBL (22.5 lbs thrust ) that turbine burns just about 10 oz of fuel at max rpms, I'm planing on a JetCat P60 ( 13.5 lbs thrust ) it burns 8 oz a minute at max rpms, I'm going with the P60 because of my experience with the fuel burn on my Boomerang XL which has a TJT300, burning 14 oz of fuel at max rpms and the way I fly, after an 8 minutes flight and two go arounds I end up with 1/4 of the 1 gallon tank.
With 80 oz ( 76 oz not including the UAT ) I'm expecting to fly for 8 minutes and have enough fuel for at least one go around, ALL this calculated because the way I fly ( relax, mild Aerobatic and at 70% throttle) flying that way I estimated the turbine will be burning around 7 oz a minute giving me nearly 11 minutes of flight from which I only want 8 minutes.
All this calculations are up in the air ( now that's funny
) 'till the airplane goes up for a real flight test I almost forget, the Boomer is 32 lbs dry and 39 lbs with a gallon of Diesel and about 42 lbs with 30 oz of smoke in it, been push with a 27 lbs thrust engine, it is a pig on TOs but after burning 1/3 of the gallon it really cooks and verticals are supper.
Last edited by CARS II; 07-03-2018 at 12:58 PM.
07-03-2018, 01:09 PM
#4107
You are absolutely right but, I prefer the plastic Dubro tanks combined with the Nelgene plastic bottles, they are more resistant to damages, I had the Jet Tech tanks on my Kangaroo, Vipier, and now on my Boomer but prefer the plastic ones.
Last edited by CARS II; 07-03-2018 at 01:15 PM.
07-03-2018, 03:13 PM
#4108
My Feedback: (48)
Just a couple of comments based on the last several posts:
I also modified the former behind the fuel tank to allow me to slide the 80 oz. tank about an inch rearward from the stock location. There is no noticeable CG change during flight. If you plan ahead there is a lot that can be done early in construction to get more fuel capacity.
I have a Jetsmunt M90 (21.5#) in mine. Full throttle fuel consumption is about 10 oz./min., but I'm rarely at WOT. I fly at 1/2 to 3/4 throttle most of the time, going to WOT once or twice for a low pass or vertical. The timer is set at 7.5 min. and I have about 1/4 tank left at the end of the flight. In sizing your fuel capacity you should pay more attention to how you are going to fly with a particular engine than what the consumption is at WOT.
I also modified the former behind the fuel tank to allow me to slide the 80 oz. tank about an inch rearward from the stock location. There is no noticeable CG change during flight. If you plan ahead there is a lot that can be done early in construction to get more fuel capacity.
I have a Jetsmunt M90 (21.5#) in mine. Full throttle fuel consumption is about 10 oz./min., but I'm rarely at WOT. I fly at 1/2 to 3/4 throttle most of the time, going to WOT once or twice for a low pass or vertical. The timer is set at 7.5 min. and I have about 1/4 tank left at the end of the flight. In sizing your fuel capacity you should pay more attention to how you are going to fly with a particular engine than what the consumption is at WOT.
07-03-2018, 04:04 PM
#4109
My Feedback: (66)
80 Oz. Fuel Tank
Hopefully this can help. The way I did mine was by moving the elevator and rudder servos with their mounting plate from the front of the fuel tank to the back bulkhead. Carbon fiber pushrods are used.No need to make the fuselage wider! The bulkhead that was directly in front of the original 50 Oz. fuel tank was cut and moved forward just enough to make room for the 80 Oz. Dubro tank. The tank was slid into place from the bottom of the fuselage just as intended for the original 50 Oz. tank. The top of the repositioned bulkhead can be seen just above the tank. The rest of the components and their locations are clearly seen in the attached pictures.
07-03-2018, 04:21 PM
#4110
Joshua
Thank you for posting those clear pictures, they sure will serve as a guide for my next Reaction build, do you have any from the back of the fuel tank? Are you using magnets to hold the rear hatch down?
My next Reaction build will have a lot of these mods, 80 oz fuel tank, intakes ( laser cut kit from LDS ) cockpit, electric retracts and brakes, 18 lbs turbine.
Tks.
Thank you for posting those clear pictures, they sure will serve as a guide for my next Reaction build, do you have any from the back of the fuel tank? Are you using magnets to hold the rear hatch down?
My next Reaction build will have a lot of these mods, 80 oz fuel tank, intakes ( laser cut kit from LDS ) cockpit, electric retracts and brakes, 18 lbs turbine.
Tks.
Last edited by CARS II; 07-03-2018 at 04:30 PM.
07-04-2018, 02:45 AM
#4113
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I still feel that the vent of your aux tank will drain the main tank due to gravity flow. Try a setup on the bench with the main higher in elevation compared to the aux and its vent.
Art
07-04-2018, 05:34 AM
#4114
Art
I understand your point of view, agreed, gravity makes the fluids from a container on a higher position flow down to the container in a lower position.
If I was to fill up the tanks and walk away then I see your concern, how about falling up the tanks and starting the engine within a minute, what do you thing will happen right after the pump begins to suck the fuel out of the main tank? Will gravity flow stops or continue?
I will test the fuel system at home before the first flight.
Tks.
I understand your point of view, agreed, gravity makes the fluids from a container on a higher position flow down to the container in a lower position.
If I was to fill up the tanks and walk away then I see your concern, how about falling up the tanks and starting the engine within a minute, what do you thing will happen right after the pump begins to suck the fuel out of the main tank? Will gravity flow stops or continue?
I will test the fuel system at home before the first flight.
Tks.
Last edited by CARS II; 07-04-2018 at 05:39 AM.
07-12-2018, 07:53 PM
#4121
I got the 16 oz Nelgene bottle and here are the fuel tanks in position, the floor has now a ply floor ( I used the ECU shelf ) and the pump will be on its own removable mount.
Time at work is good for two things, to make money to pay for the toys and to dream about your builds and installs, it is nice when what you think converts to reality the same way you thought it
One more pic to show servo clearance.
Last edited by CARS II; 07-13-2018 at 12:29 AM.
07-21-2018, 01:43 PM
#4122
My jet budy told me today that he enjoyed reading and looking at the pictures on this thread and asked why I haven't posted lately?
The build on my Reaction continues, I've been preoccupied trying to get ready for a new job that will take 100% of my time on the last 1/4 of the year but should have regular free time by Dec. I will continue to post the little work that I can do for now, hope to have the jet done by Oct.
The build on my Reaction continues, I've been preoccupied trying to get ready for a new job that will take 100% of my time on the last 1/4 of the year but should have regular free time by Dec. I will continue to post the little work that I can do for now, hope to have the jet done by Oct.
Last edited by CARS II; 07-22-2018 at 05:44 AM.
07-22-2018, 06:16 PM
#4123
My Feedback: (3)
A few videos of Josh’s R54 today ... videos are from first flight of the day. It was a little windy and we floated the landing on this video. Still turned out ok. The next ones were better ... better to come in a little hot than to come up short!
As you can see on the takeoff video, the Jet Munts 100XBL is plenty of push for this plane. The flyby was half throttle. Great match.
Josh did a great job building this example and his training is going well. Nice job, Josh!
As you can see on the takeoff video, the Jet Munts 100XBL is plenty of push for this plane. The flyby was half throttle. Great match.
Josh did a great job building this example and his training is going well. Nice job, Josh!
Last edited by jsnipes; 07-22-2018 at 06:20 PM.
08-26-2018, 04:29 AM
#4125
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xxq111,
Several sketches and dimensions for R54 intakes are described in this thread, you have to dig back to find them. I don't know if a ready set of intakes are available.
Rgds,
Art ARRO
Several sketches and dimensions for R54 intakes are described in this thread, you have to dig back to find them. I don't know if a ready set of intakes are available.
Rgds,
Art ARRO