Carf rebel pro
11-25-2022, 04:54 AM
#527
My Feedback: (53)
More testing and here is what I noticed. When the UAT is drained, there is air that gets trapped inside that silver filter area. At low pump PW, its not enough to suck it out, but at high PW it is. However, once I do a vertical line, it will start sucking out the trapped air at 100 pw, and near 300 PW there is a lot of air. Rocking the UAT back and forth simulating up and down lines, everytime air goes into the line.
I think once it is completely purged it wouldnt be an issue but should I put up with this from a UAT? I have a recent BVM UAT sock type, I think I’ll just use that.
I think once it is completely purged it wouldnt be an issue but should I put up with this from a UAT? I have a recent BVM UAT sock type, I think I’ll just use that.
I don’t have one that come from Global either Germany or USA, when Peter stop selling them I got a large order and still have 1 new one…..so I don’t know if they are different, I don’t think Peter sold the right….he just not producing them….
11-25-2022, 05:29 AM
#528
[QUOTE=rc4flying;12752429][I once had a gas engine fuel system causing air bubbles in the fuel line and the engine to flame out. It turned out to be a bad fuel pickup in the fuel tank causing the bubbles. I would have never suspected that problem without changing to clear line to do the true troubleshooting needed. The pickup was the bubble causing culprit. Changed the pickup, problem solved.]
As I stated above in my past experience. Now that I see those bubbles coming from the UAT, I would be changing out the UAT with another type to put the test of the filter in the UAT is causing the bubbles. There is just something maybe in this particular UAT's filter construction that maybe be causing the fuel to create those intermittent bubbles. As I have said, I seen this with a filtered pickup on a gas engine, I changed out the filtered pickup with an identical type, both were brand new, my problem was solved. reinstalled first filter and bubbles came back.
It would be worth the time to prove this out in my opinion.
As I stated above in my past experience. Now that I see those bubbles coming from the UAT, I would be changing out the UAT with another type to put the test of the filter in the UAT is causing the bubbles. There is just something maybe in this particular UAT's filter construction that maybe be causing the fuel to create those intermittent bubbles. As I have said, I seen this with a filtered pickup on a gas engine, I changed out the filtered pickup with an identical type, both were brand new, my problem was solved. reinstalled first filter and bubbles came back.
It would be worth the time to prove this out in my opinion.
11-25-2022, 10:08 AM
#529
My Feedback: (11)
A couple notes:
I did drain it because I replumbed the system. Before I flew here is what I did on the ground:
Pulled the fuel line out of the turbine and took the pump PW past 300.
Once I started the jet, I went to WOT for about 10 seconds.
I did a 5 minute flight for the most part a goose flight.
Refueled.
ONce again went to WOT for 5 seconds.
Flew around for 4 minutes this time with verticle motions.
Flameout.
What is taking to get the air out of this:
Move UAT verticle.
Take pump PW to past 400
It continues to let air out for several minutes. Small air bubbles.
It probably takes me a good 3-4 minutes at 400 PW to ensure the air is gone.
This is not normal, I have an older intairco I drain all the time. A simple run up to WOT is all it is needed.
Im not going to say these are fake, but something is wrong with them. I am changing brands and this UAT beat up my brand new rebel pro.
I like the looks of these glass ones but Im going back to BVM uat. Or MAP I hear those are good.
This is 100% a UAT issue and while we can speculate about pruging, I assure the purging process is not normal, and there is not certainty it is purged!
In the end Im glad I figured it out. Ill report back staruday Im going to fly with the BVM UAT>
I did drain it because I replumbed the system. Before I flew here is what I did on the ground:
Pulled the fuel line out of the turbine and took the pump PW past 300.
Once I started the jet, I went to WOT for about 10 seconds.
I did a 5 minute flight for the most part a goose flight.
Refueled.
ONce again went to WOT for 5 seconds.
Flew around for 4 minutes this time with verticle motions.
Flameout.
What is taking to get the air out of this:
Move UAT verticle.
Take pump PW to past 400
It continues to let air out for several minutes. Small air bubbles.
It probably takes me a good 3-4 minutes at 400 PW to ensure the air is gone.
This is not normal, I have an older intairco I drain all the time. A simple run up to WOT is all it is needed.
Im not going to say these are fake, but something is wrong with them. I am changing brands and this UAT beat up my brand new rebel pro.
I like the looks of these glass ones but Im going back to BVM uat. Or MAP I hear those are good.
This is 100% a UAT issue and while we can speculate about pruging, I assure the purging process is not normal, and there is not certainty it is purged!
In the end Im glad I figured it out. Ill report back staruday Im going to fly with the BVM UAT>
11-25-2022, 11:24 AM
#530
Senior Member
Try this UAT tank https://www.modelaviationproducts.co...-accessories/6
In my photo is a high flow 6oz tank but it sits at 45 degrees to allow air up and not close to the pickup.
The group I fly with all use these tank without any large amounts of air after aerobatic maneuvers or flameouts.
Is that Tygon line from your tank to the UAT, most engine manufacturers suggest Festo clear as it doesn't collapse under pressure.
Did you move the lines around while the pump is running to check for air leaks?
In my photo is a high flow 6oz tank but it sits at 45 degrees to allow air up and not close to the pickup.
The group I fly with all use these tank without any large amounts of air after aerobatic maneuvers or flameouts.
Is that Tygon line from your tank to the UAT, most engine manufacturers suggest Festo clear as it doesn't collapse under pressure.
Did you move the lines around while the pump is running to check for air leaks?
11-26-2022, 01:22 PM
#531
Member
I'm trying to decide on which size UAT to put in the Rebel. I am leaning towards the FCT UAT https://fctjet.com/
I saw someone in the thread had a 100ml size in their Rebel, but I'm trying to decide between the 200ml (6.75oz) and the 350ml (~12oz) to go with my newly acquired Swiwin 220N.
I know that FCT is better known in the UK and Europe so if some of the regulars in this thread from across the pond can chime in, it would be much appreciated.
Cheers,
Pete
I saw someone in the thread had a 100ml size in their Rebel, but I'm trying to decide between the 200ml (6.75oz) and the 350ml (~12oz) to go with my newly acquired Swiwin 220N.
I know that FCT is better known in the UK and Europe so if some of the regulars in this thread from across the pond can chime in, it would be much appreciated.
Cheers,
Pete
11-26-2022, 04:06 PM
#533
Member
11-27-2022, 11:43 AM
#534
Senior Member
These UATs look similar to the other glass tubes UAT, with a lot of very glamorous jewelry to trap air bubbles.
From this photo, it looks like the pickup screen is near the rear of the cylinder so to avoid air going into the pump when vertical descending our planes.
It should mount it at 45 degrees to keep the air pocket from the inlet.
I know a lot of you Jet guys like the look of it on the crown deck of the Rebels but really it's a tool to help us fly without air bubbles into the engine.
Mounting it in line with the tank and engine helps to create a more centred CG when doing axial rolls increasing the flight performance of the aircraft.
From this photo, it looks like the pickup screen is near the rear of the cylinder so to avoid air going into the pump when vertical descending our planes.
It should mount it at 45 degrees to keep the air pocket from the inlet.
I know a lot of you Jet guys like the look of it on the crown deck of the Rebels but really it's a tool to help us fly without air bubbles into the engine.
Mounting it in line with the tank and engine helps to create a more centred CG when doing axial rolls increasing the flight performance of the aircraft.
11-28-2022, 07:48 PM
#535
My Feedback: (11)
This is what I ended up doing, Im not sure why as my older intaircos do not need this. Ill think it over, I may not get to fly until spring. I just want this to work as I have 3 of them and if I give up on all 3 have to go into the trash.
I spent awhile purging air, it takes ALOT to get the air out of the filter. Never ever had this issue before. Ill keep it full and then Ill got wot and lift up the nose before flight.
I spent awhile purging air, it takes ALOT to get the air out of the filter. Never ever had this issue before. Ill keep it full and then Ill got wot and lift up the nose before flight.
11-29-2022, 12:08 PM
#537
Senior Member
This is what I ended up doing, Im not sure why as my older intaircos do not need this. Ill think it over, I may not get to fly until spring. I just want this to work as I have 3 of them and if I give up on all 3 have to go into the trash.
I spent awhile purging air, it takes ALOT to get the air out of the filter. Never ever had this issue before. Ill keep it full and then Ill got wot and lift up the nose before flight.
I spent awhile purging air, it takes ALOT to get the air out of the filter. Never ever had this issue before. Ill keep it full and then Ill got wot and lift up the nose before flight.
So does it fit under the canopy?
I tried my MAP tank here but it made contact with the canopy so it went down below away from all the electronics which don't like Kerosene fuel juice. Lol
Still running Tygon , only for fueling the tank and overflow line.
11-29-2022, 12:21 PM
#538
My Feedback: (11)
I had to take a bit of angle out, I had it at 50 degrees its about 30 now. I was hoping to go fly it, maybe Ill get a chance this year yet. If not and hard cold sets in, I may actually mount this vertically down below. This would help it purge during idle and wot run up before taxi out. Some sort of flaw with these that holds air inside the silver filter. My other one is mounted horizontal for 12 years and I drain it all the time. This is def strange.
11-29-2022, 12:32 PM
#539
Senior Member
I had to take a bit of angle out, I had it at 50 degrees its about 30 now. I was hoping to go fly it, maybe Ill get a chance this year yet. If not and hard cold sets in, I may actually mount this vertically down below. This would help it purge during idle and wot run up before taxi out. Some sort of flaw with these that holds air inside the silver filter. My other one is mounted horizontal for 12 years and I drain it all the time. This is def strange.
With it 45 degrees it's a lot less likely to inhale air into the filter. Putting it vertically you'll inhale air while staying inverted! Oh and change that Tygon feed line from the tank.
11-29-2022, 12:38 PM
#540
My Feedback: (11)
Hey glad you tried this position but if you mount it below you have lots of room for mounting .
With it 45 degrees it's a lot less likely to inhale air into the filter. Putting it vertically you'll inhale air while staying inverted! Oh and change that Tygon feed line from the tank.
With it 45 degrees it's a lot less likely to inhale air into the filter. Putting it vertically you'll inhale air while staying inverted! Oh and change that Tygon feed line from the tank.
I found tygon works well for the fill line as its easy to remove the fuel dot and plug it back in.
11-30-2022, 09:53 AM
#545
Senior Member
Totally agree Scott. Lol
11-30-2022, 11:52 AM
#546
Member
I received my FCT UAT today. It is a very nice piece of kit, well sized barbed compression fittings and the fuel intake is centred in all directions in the tank. Giddy up slow boat from Thailand! Parts are building up with no home.
200ml FCT UAT
200ml FCT UAT
11-30-2022, 11:53 AM
#547
Yea, I had an entire corner of my shop devoted to turbine, radio equipment, servos, UAT et all for my Hot and looked at it wistfully for a couple months before the airplane finally arrived. I was at the Old Dominion depot before the pictures downloaded from the email I got
11-30-2022, 12:37 PM
#548
My Feedback: (11)
Maybe off topic, but how do these UAT work? I know the old BVM uat have a sock and as long as fuel is touching it, it sucks fuel not air. Same with the ones that use the paper filters.
Mine having what looks like a fish tank diffuser, and others like it, what is the principle behind the operation? As in what is the point of the stone filter.
Mine having what looks like a fish tank diffuser, and others like it, what is the principle behind the operation? As in what is the point of the stone filter.
11-30-2022, 02:36 PM
#549
Senior Member
[QUOTE=Racer686;12753194]I received my FCT UAT today. It is a very nice piece of kit, well sized barbed compression fittings and the fuel intake is centred in all directions in the tank. Giddy up slow boat from Thailand! Parts are building up with no home.
200ml FCT UAT
That looks like it will work just fine. Now are up mounting it at 45 degrees, so the air stays up the fill inlet?
So is that a glass tube pressed against an o-ring and held together with the clamps?
Keep getting all your parts and even more so when the assembly begins it will finish without hiccups .Do you have your Gyro purchased?
200ml FCT UAT
That looks like it will work just fine. Now are up mounting it at 45 degrees, so the air stays up the fill inlet?
So is that a glass tube pressed against an o-ring and held together with the clamps?
Keep getting all your parts and even more so when the assembly begins it will finish without hiccups .Do you have your Gyro purchased?
11-30-2022, 04:09 PM
#550
Member
That looks like it will work just fine. Now are up mounting it at 45 degrees, so the air stays up the fill inlet?
So is that a glass tube pressed against an o-ring and held together with the clamps?
Keep getting all your parts and even more so when the assembly begins it will finish without hiccups .Do you have your Gyro purchased?
So is that a glass tube pressed against an o-ring and held together with the clamps?
Keep getting all your parts and even more so when the assembly begins it will finish without hiccups .Do you have your Gyro purchased?
I ordered the Powerbox Competition SR2 with igyro sat and gps on Black Friday. I'm still tracking, honestly, 11 packages from Black Friday plus I just ordered my CMJets tank and I still need to order my Electron retracts. Who by the way, (Electron) did not have a Black Friday sale like they did last year, that 20% off was really gonna help my sanity as I was spending up a storm for this jet. I must have refreshed their website, Facebook page and Insta page 100 times each, over the course of the day waiting for the code to appear.
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Skunkwrks (11-30-2022)