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RE: Boomerang Sprint Build Thread! - 8/3/2011 12:03 AM   
BaldEagel



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From: Wychling, Kent, UNITED KINGDOM
Status: offline 		The easiest place to get one is in a ship chandlers that sells outboard motors its used a lot in salt water environments.

Mike

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RE: Boomerang Sprint Build Thread! - 8/3/2011 12:35 PM   
Turbinac


 

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From: London, UNITED KINGDOM
Status: offline 		Even easier, bought mine on Ebay.
Definitely works. Still can't figure out exactly how!!

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       Post #: 1927

RE: Boomerang Sprint Build Thread! - 8/3/2011 1:05 PM   
VF84sluggo



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From: Gulf Breeze, FL, USA
Status: offline 		I 'googled' Mr. Funnel, and it does appear to be quite the gizmo! I'll have to get one

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       Post #: 1928

RE: Boomerang Sprint Build Thread! - 8/11/2011 12:16 AM   
Dblex


 

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From: Corpus Christi , TX, USA
Status: offline 		Can anyone suggest affordable retracts for this kit? I really dont want to spend $100 less than my kit for retracts......

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       Post #: 1929

RE: Boomerang Sprint Build Thread! - 8/11/2011 2:17 AM   
Xairflyer



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From: Co. Donegal, IRELAND
Status: offline 		Have a look at retract sets for other aircraft, like Jet legend etc, you could also buy one brand of retract bodies then add trailing link legs from another source.
Eurokit have a good range of retract bodies and also trailing link legs (CAR/15082/001) at good prices, perfectly good enough for this weight of model.

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       Post #: 1930

RE: Boomerang Sprint Build Thread! - 8/23/2011 11:40 AM   
steve2972


 

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quote:

ORIGINAL: BaldEagel

I don't keep my fuel in a fuel bowser, but in a 25lt plastic barrel, when I trasfer into my fuel bowser I use a ''Mr Funnel'' filter that will not allow water to pass, this seems to work quite well as I have never had a filter of any kind block or even look as though they are getting contaminated, working it all out it seems before my fuel gets to the turbine it is filtered six times.

Mike


Hi Mike,
Do you add turbine oil to the fuel and then filter tru` Mr Funnel or do you add the oil after you`ve filtered?

Steve

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       Post #: 1931

RE: Boomerang Sprint Build Thread! - 8/23/2011 11:51 AM   
Xairflyer



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quote:

ORIGINAL: steve2972


quote:

ORIGINAL: BaldEagel

I don't keep my fuel in a fuel bowser, but in a 25lt plastic barrel, when I trasfer into my fuel bowser I use a ''Mr Funnel'' filter that will not allow water to pass, this seems to work quite well as I have never had a filter of any kind block or even look as though they are getting contaminated, working it all out it seems before my fuel gets to the turbine it is filtered six times.

Mike


Hi Mike,
Do you add turbine oil to the fuel and then filter tru` Mr Funnel or do you add the oil after you`ve filtered?

Steve

I do both, filter into my mixing drum, add the oil then filter each time I fill up my fuel station

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       Post #: 1932

RE: Boomerang Sprint Build Thread! - 8/23/2011 11:56 AM   
steve2972


 

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quote:

ORIGINAL: Xairflyer


quote:

ORIGINAL: steve2972


quote:

ORIGINAL: BaldEagel

I don't keep my fuel in a fuel bowser, but in a 25lt plastic barrel, when I trasfer into my fuel bowser I use a ''Mr Funnel'' filter that will not allow water to pass, this seems to work quite well as I have never had a filter of any kind block or even look as though they are getting contaminated, working it all out it seems before my fuel gets to the turbine it is filtered six times.

Mike


Hi Mike,
Do you add turbine oil to the fuel and then filter tru` Mr Funnel or do you add the oil after you`ve filtered?

Steve

I do both, filter into my mixing drum, add the oil then filter each time I fill up my fuel station


Is that using Mr Funnel both times?


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       Post #: 1933

RE: Boomerang Sprint Build Thread! - 8/23/2011 12:06 PM   
Xairflyer



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Status: offline 		yes would'nt use any other type of funnel

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       Post #: 1934

RE: Boomerang Sprint Build Thread! - 8/23/2011 12:10 PM   
steve2972


 

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From: southamwarwickshire, UNITED KINGDOM
Status: offline 		Thanks for the info.What do you do with the waste/sump?



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       Post #: 1935

RE: Boomerang Sprint Build Thread! - 8/23/2011 12:12 PM   
BaldEagel



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From: Wychling, Kent, UNITED KINGDOM
Status: offline 		As Xairflyer, I filter through the Mr Funnel filter after adding the oil, if you get hold of one, try a little experiment and add a little water to a small amount of Kero and pour it through the filter, the water will just separate and be left in the filter, whilst the Kero will go through.

Mike

EDIT: What you do with the waste is up to your conscience.

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RE: Boomerang Sprint Build Thread! - 8/23/2011 12:16 PM   
Xairflyer



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quote:

ORIGINAL: steve2972

Thanks for the info.What do you do with the waste/sump?



I tip it into the drum I use for the oil burner than runs the central heating in my workshop. You could collect it in a drum and then re-filter it through again when enough is accumulated.

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RE: Boomerang Sprint Build Thread! - 8/23/2011 12:30 PM   
Xairflyer



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From: Co. Donegal, IRELAND
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quote:

ORIGINAL: BaldEagel

As Xairflyer, I filter through the Mr Funnel filter after adding the oil, if you get hold of one, try a little experiment and add a little water to a small amount of Kero and pour it through the filter, the water will just separate and be left in the filter, whilst the Kero will go through.

Mike

EDIT: What you do with the waste is up to your conscience.

This is what actually sold me on the Mr Funnel about ten years ago when I bought my first one. The first microlights I started flying many years ago were all two strokes and water in the fuel bowl moving over the main jet, would have made the engine go silent (not a good idea when flying).
So removing water from the fuel was important. We first used to use a chamois leather over the funnel, as once you pass petrol through a chamois leather it will not let water through after that.

Then at one of the Microlight trade shows David from Ridgeway Air had imported the Mr Funnels and demonstrated it by having one sitting full of water all day over a glass jar, from then on that is all we have used. I have the big 8" one for the fullsize use and the 5" one for the jet kero.
I also have the little 3" one but I have found it too small really to be of any use, other than keeping in the aeroplane for when you need fuel away from home.

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RE: Boomerang Sprint Build Thread! - 8/23/2011 12:37 PM   
steve2972


 

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Status: offline 		Thanks for the info guys,just ordered one!

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       Post #: 1939

RE: Boomerang Sprint Build Thread! - 8/28/2011 4:17 PM   
Minch


 

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My dad's part way through building a Sprint, it's going to have a Jetcat p70 fitted, do we need to put the usual 3/8" shim under the Jetcat mount to centre the turbine or does it not matter on this model.

Thanks

Nick

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       Post #: 1940

RE: Boomerang Sprint Build Thread! - 8/28/2011 5:03 PM   
chris1971


 

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From: catoosa, OK, USA
Status: offline 		Nick,

Yes I put shims under my Jetcat when it was on my Sprint.

Chris

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       Post #: 1941

RE: Boomerang Sprint Build Thread! - 8/29/2011 8:07 AM   
kimhey


 

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From: T�nsberg, NORWAY
Status: offline 		Used P80se in mine, without shim.

Problem free operation in every aspect..

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       Post #: 1942

RE: Boomerang Sprint Build Thread! - 10/9/2011 11:32 PM   
chris1971


 

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From: catoosa, OK, USA
Status: offline 		Here is a video of my Sprint and some Flashes at a local jet meet.

http://www.youtube.com/watch?v=1TQCKDHHOmA

There are a lot more youtube videos of our local jets under rcvideoshooter .
We had an awesome day and the weather couldn't have been better!

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       Post #: 1943

RE: Boomerang Sprint Build Thread! - 11/24/2011 7:29 AM   
John H.


 

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From: wasco, CA, USA
Status: offline 		You can use a sheep-skin shammy IN a funnel to remove the water from the fuel. Once the shammy is soaked in the fuel, it will not pass water. This method has been used for many years when fueling aircraft from drums.

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       Post #: 1944

RE: Boomerang Sprint Build Thread! - 11/24/2011 9:19 PM   
BaldEagel



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From: Wychling, Kent, UNITED KINGDOM
Status: offline 		If you want to remove water from fuel use a "Mr Funnel" works every time, you can get one from a boat chandler.

Mike

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       Post #: 1945

RE: Boomerang Sprint Build Thread! - 11/29/2011 1:50 AM   
mjunior


 

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From: Sao Jose dos CamposSP, BRAZIL
Status: offline 		Just to let know about the Sprint top speed measured this past weekend.

Simple measurment device, a car GPS installed inside.

240 Km/H (150MPH), 600m (1800ft), 23°C (70F)

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       Post #: 1946

RE: Boomerang Sprint Build Thread! - 1/24/2012 9:35 PM   
jmbell


 

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From: bellmawr, NJ, USA
Status: offline 		im just finishing up my sprint and wanted to know if everybody is venting there fuel tanks out the bottom of the plane like a gasoline engine

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       Post #: 1947

RE: Boomerang Sprint Build Thread! - 1/24/2012 9:48 PM   
BuschBarber


 

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quote:

ORIGINAL: jmbell

im just finishing up my sprint and wanted to know if everybody is venting there fuel tanks out the bottom of the plane like a gasoline engine

Yes!

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       Post #: 1948

RE: Boomerang Sprint Build Thread! - 1/24/2012 10:48 PM   
BaldEagel



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From: Wychling, Kent, UNITED KINGDOM
Status: offline 		No, vent it out the back, outherwise you will get major disscoloring of the film that is goes past.

Mike

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       Post #: 1949

RE: Boomerang Sprint Build Thread! - 4/24/2012 8:12 PM   
EDFCrazy


 

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From: Cumbria, UNITED KINGDOM
Status: offline 		Hi iv almost finished Assembling my Sprint, and have a few questions.

does the end of your turbine's nozle stick out the back of your sprint? mine is about an inch inside the plane. is this ok?

has everyone glued there center wing section on, i have only bolted mine in position is this ok? i dont see how if you glue those four small pieces of ply that locate into the center wing section will add that much strength?

What CG are you running? mine with the jets munt VT 80, and 2 batteries in the front (2cell 4000 lipo & 2300 A123) i have to put about a pound of lead in the nose to get it to balance at the rear of the wing tube (the 10" from trailing edge) that the manual recommends. Right now my CG is around 8.5 inches from the trailing edge. i have attached some pics.


Below are some comments that i found on page 48 of this thread

I moved mine a good 25mm further back than recommended and cut out the nose dropping tendency in turns, flew much nicer with lighter nose.

balance the plane per the below to start:
DRY
OUTER WINGS OFF
MAIN CF SPAR IN
GEAR DOWN
ALL EQUIPMENT INSTALLED RTF
250mm from TRAILING EDGE (flap) ~ 9-7/8"
This will put the CG on the aft edge of the main spar CF tube (NOT centered on the tube), therefore I must lift the plane from under the booms.

Right now my CG is about 1/4" back from the 250mm so I need to add about 2oz in the nose to balance out. Does this sound like its the correct way to balance this plane?


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       Post #: 1950

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