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Ripmax Xcalibur Sports jet

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Ripmax Xcalibur Sports jet

Old 07-16-2014, 12:59 AM
  #776  
Dave Wilshere
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Originally Posted by Nev01
Hi Dave,

Yes, everything arrived safely thanks.

With regards to the fuel filter, as I already have a built in filter would it do any harm to put an additional large filter after the pump or would this offer to much restriction to the pump?

Nev.
Nev

Spoke to a friend of a friend who is also running a Wren 80 in an Xcalibur and he added an external filter...

Dave
Old 07-16-2014, 02:18 AM
  #777  
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I run a couple of Wren turbines and both have a jetcat filter after the pump and before the solenoids.

Regards,
Simon
Old 07-16-2014, 06:28 AM
  #778  
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Dave/Simon,

Thanks for your advice. Wren Turbines have just returned my earlier phone call and confirmed that an external large filter fitted after the pump is fine.

Simon, Was it you that I had the pleasure of meeting at Greenacres Fun Fly last month? It was late in the day and you were just packing away your Boomerang jet.

Nev.
Old 07-16-2014, 07:21 AM
  #779  
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Did some inspecting this morning, and found my right rudder piece is damaged Need to find a new one. Anyone know where i can get a replacement ? or know of one that has a spare i can buy ?

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Old 07-16-2014, 09:06 AM
  #780  
Dave Wilshere
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Talk to where you bought it!
Old 07-16-2014, 10:05 AM
  #781  
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Nev,

Yep, that was me. Good to see you getting started, you will enjoy that model.
Thought I recognised the name. Can post a pic of my set up in the Sprint if you want, but I've got a stop valve just after the pump, then the jetcat filter, then the solenoid.

Cheers,
Simon
Old 07-16-2014, 11:22 AM
  #782  
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Originally Posted by Dave Wilshere
Talk to where you bought it!

Bought it open box from a member on here..
Old 07-16-2014, 11:28 AM
  #783  
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Hi Simon,

Yes a pic would be great, it all helps this newbie. I shall also be fitting a stop valve after the pump so I guess I shall have a very similar set up.

One thing I have forgot to ask, is the Jetcat filter directional, does it matter which way round you fit it? there doesn't appear to be any arrows on it, so I guess either way will be ok.

Best Regards,
Nev.
Old 07-16-2014, 11:48 AM
  #784  
Dave Wilshere
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From the CAP is the obvious way, but I have it from the housing, so the crud would end up on the outside of the mesh (not that I have had to clean one in 12 years!)

Dave
Old 07-16-2014, 12:05 PM
  #785  
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Just had a peep inside the filter, I see what you mean Dave, thanks.

Nev.
Old 07-16-2014, 12:10 PM
  #786  
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Nev,

This is how mine are fitted. I've left it floating loose and then give it a good flick when priming the system to make sure there are no air bubbles. I hope they are the right way around, I just followed the schematic in a jetcat manual which showed the filter in the orientation I have it. Not sure if Dave has mentioned putting some grease on the thread, and nipping the filter up once if has had time to settle.

Cheers,
Simon
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Old 07-16-2014, 12:32 PM
  #787  
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Simon,

I appreciate you taking the time to post the pic (it all helps) and the offering up of some more useful tips. I guess I'm going through a steep learning curve at the moment and hope you guy's don't mind all the numpty questions , I'd rather be safe than sorry.

Cheers,
Nev.
Old 07-16-2014, 01:29 PM
  #788  
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The only silly questions are the ones you don't ask. Been flying jets for about a year and it does seem a bit overwhelming to begin with, but if you can build to a good standard you will not go far wrong. There are many different opinions on things, but Daves advice is sound and he knows his stuff. Are you going to get her in the air this year?
Old 07-17-2014, 03:14 AM
  #789  
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I have set no real timetable Simon, I will get all I need around me and then make a start putting it all together, if all goes well and it flies this year then great, but if it works out to be next year I really won't mind. That said, I could have a go at breaking Dave's record of a three day build :-)

Nev.
Old 07-17-2014, 02:42 PM
  #790  
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When mounting any cylindrical volume in a flow path with center fittings, the cylinder should be mounted vertically with the inlet and outlet in the vertical rather than the horizontal. That way, air cannot accumulate in the volume above the centerline. At least, the cylinder should be mounted at 45deg or more relative to the horizontal.

Paul S
Old 07-17-2014, 11:41 PM
  #791  
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Originally Posted by paulsf86
When mounting any cylindrical volume in a flow path with center fittings, the cylinder should be mounted vertically with the inlet and outlet in the vertical rather than the horizontal. That way, air cannot accumulate in the volume above the centerline. At least, the cylinder should be mounted at 45deg or more relative to the horizontal.

Paul S
As Per JetCat instructions, glad someone else has read them.

Mike
Old 07-17-2014, 11:59 PM
  #792  
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My filters are left to float (not fixed horizontally) and I give them a good flick when fueling for the first time to make sure any air is removed. Not had any problems since installing and have seen plenty of others fitted in exactly the same way. I can see the reason for mounting vertically, but personally I have not had any problems.

Simon
Old 07-18-2014, 12:52 AM
  #793  
Dave Wilshere
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I agree with what is said...but I don't (never have) own a jet with the filter mounted vertically and I don't get problems...if the filter does not leak, clearing bubbles from new as Si says works perfectly.

Dw
Old 07-18-2014, 09:09 AM
  #794  
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The issue with the horizontal mounting is cummulative. Any air in the system entering the filter will collect in the area above the inlet and outlet fittings. If enough air enters and enough time passes, you will accumulate enough air to create a problem. Flicking the filter does not do any good as the air has no place to go.

Paul S
Old 07-18-2014, 10:23 AM
  #795  
Dave Wilshere
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Well 12 years of flying jets that don't just do circuits, they fly vertical up and down(making the filter vertical) changes things, also up side down, and this has shown me its just fine, because air bubble stops for me and my many followers are near zero in many many thousands of flights. leak free filters and joints are everything...
Old 07-18-2014, 10:42 AM
  #796  
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Dave:

Not to prolong the argument or challenge your experience. I am just stating the convention that is followed by those of us that have worked in the fluids flow industry. By the way, the first defense is as you say, an air tight system. Also, if you collect air in the horizontal mode and then go vertical, it will release the air bubble. Inverted, does not make a difference since the filter stays horizontal.

Paul S
Old 07-18-2014, 12:55 PM
  #797  
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Sometimes in life convention does not apply. I worked for 11 years as a mechanical design engineer (Lift industry) we worked with hydraulics and pneumatics, did a HNC/HND including most of the dynamics, so I have a grounding I can add to 40+ years playing with toys. Lets say its a good practice to mount them vertically, I would not avoid an installation that ended up with that orientation, but I've proved to myself its not a critical element for reliable operation.
Old 07-18-2014, 01:34 PM
  #798  
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ok

Paul S
Old 07-18-2014, 03:25 PM
  #799  
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I have been having a ball with my Excalibur lately and thought that I would add some lights. Saw some small Dorcy LED torch globes at a electronics shop for around $4 each, so bought them and tried them on 6v from my powerbox in the jet and was pleasantly surprised how bright they are! The front of the booms are made from solid balsa block so drilled a couple of holes and push fitted them in there. By keeping them off the wings, it keeps it simple with wiring, and they seem really bright in sunshine, but will be even better on a dull overcast day. By the way, is 40 lumens a very bright light? Up until now, I have been flying this jet without a header tank. Recently, landed after a 8 minute flight, (2 litre tank), and had to hit the brakes reasonably hard as end of the runway was coming up fast, and the jet stopped, but the engine stopped! Walked over and carried it back, wondering why it stopped. There was still about 1/2 inch of fuel in the tank, and what I think had happened, was that the fuel had shot forward, exposing the clunk, no header, flameout! I have now fitted a small header, made up from a small Dubro tank.
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Old 07-19-2014, 09:21 AM
  #800  
Dave Wilshere
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I flew Ripmax's prototype with no hopper, but a felt clunk (silver demo video) and it never missed a beat. Perfect tank shape

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