Viper1GJ

My Feedback: (20)

Oli,

It looks like you have a total 1/4" ID fuel solution now. The last part needed is a practical way to attach an overflow tank quick disconnect to the UHF 1/4" ID vent fitting? A must have at big meets where you may have to idle a while waiting for clearance to fly.

I was looking for something like the Dreamworks Start Up Overflow plug in system for the 1/4" UHF vent fitting.

Any suggestions?

Thanks

olnico

I have a plug in the making. Simple fitting with an o'ring.
Will post it here after my vacations!

Viper1GJ

My Feedback: (20)

Sound great, have good vacation!

olnico

Thanks!
The units are being produced right now.
Here is a screen shot of the CAD.

Viper1GJ

My Feedback: (20)

Have a nice vacation away from sims and cockpit. Looking forward to seeing all the pieces on the web site.

Gary

olnico

Here is the taxi fitting with its vent fitting. Two o'rings ensure a precise fit. The large safety wire zone allow for an easy installation of the Tygon line.
The 3/16" version below.



The fitting alone in 1/4".




http://www.ultimate-jets.net/product...f-taxi-fitting

jason

My Feedback: (1)

Oli

my experience is this type of vent (flush) is not good. I have made them in the past thinking what a great idea, nothing sticking out the model to pop holes in covers, clean looking and in case of a gear up there will be less damage etc. But I found in flight the flush fitting syphons the fuel out the fuel tanks and you can end up with a nice vapour trail and in my case fuel inside my Ultra bandit fuse where it ran rearwards and entered via in the NACA vents.

I was actually really annoyed with myself for making this part as a couple of year prior to building this jet I did the same on another but forgot it didn't work..

Jason

FalconWings

My Feedback: (57)

Nothing like a forward facing susage cut vent port.....it will actually put 1/2 psi of positive pressure in the main tanks, opposite to potentially creating an unwanted vacuum. That's what I do on the big ones (full scale).

They don't look as nice though.

olnico

I hope that you don't blow natural winds in there! Lol.

FalconWings

My Feedback: (57)

That would be classified!

Viper1GJ

My Feedback: (20)

Nice looking fittings. Are they available now?

Wonder if there is a way to make them forward facing to avoid the siphon issue?

Gary

olnico

Here is what you guy need:



It is a laser printed extension that inserts in the fuel vent and offers the same inlet surface as the tube inner surface.



It has a cone pocket that drives the dynamic pressure right into the vent plug.
The scoop can be removed to insert the fuel vent taxi fitting if required.
The extension is a slightly oversized but flexible. So it is a tight fit into the vent.



http://www.ultimate-jets.net/collect...rization-scoop

FenderBean

nice stuff here, these are the little things that make a build fun

yeahbaby

My Feedback: (21)

Ollie nice work, how does the flush mount fitting attach to the fuselage? Is there a nut attached not in photo? Looks great and I will be ordering a set for my latest project.

Additionally, how many cycles can we reasonably expect to get out of forward facing insert?

olnico

No nut. It is designed to be glued in the fuselage.

I would say a good 30 to 40 cycles. I think that kerosene corrosion would soften it before the insertion/ extraction cycles get it damaged. Anyway, it is very easy to change and reasonably cheap I guess.

Viper1GJ

My Feedback: (20)

The new parts look great. Are they available now?

yeahbaby

My Feedback: (21)

Good to know amigo. A great product certainly.

olnico

Yes. The first batch of fittings has shipped to Houston.

Desertlakesflying

My Feedback: (28)

Oli,
I want to publicly thank you for some great service I received on my first order from you. I was actually surprised that you took the extra effort to get the clunk here at the same time as the rest of my order even though it was not in stock in Texas. That is some service there. I'll be ordering more as I move to more jets, and I won't be going anywhere else to get the things i can get from you after service like I have received from you. Thanks for making it simple, and for all the research you do.

Quandry

Hi Oli et al,

Some turbines bigger >140N have fuel pump feeds with 6mm input and 4mm output. In this case do you think it's necessary to run 6mm fittings/pickups in whole fuel chain - i.e. filter, header, main tank feed, clunk, and breather ? or is it only necessary to have a 6mm output on the fitting closest to the pump input?

Given that it's a serial system, it seems likely to me that 6mm is needed all the way through but I don't want to have to change my fittings..

Interested in your thoughts

Quandry

No reply to this but I've come to my own conclusion that I will upgrade the fuel chain to 6mm throughout... no point penny pinching on fittings at this stage

olnico

Sorry, I missed that.
I highly recommend running a coherent system throughout.
If your pump input is 6 mm, try to run 6 mm lines to the 6 mm air trap.
From the air trap, if you have two or more tanks, also try keeping the same 6 mm supply chain. Especially if the tanks are daisy chained.

For info , I attended Top Gun and was very interested in what people were using for their fuel systems.
Generally speaking, I found the installations to be well done but often with a weak point in the link ( either a lower end air trap, a restrictive fitting, smaller diameter tube or tight tube turn at one point.
I counted 8 engine flameouts during the week-end. A good portion of which were fuel system related.

On the B-300F, you can insert a 6 mm brass tube into the pump input festo fitting and run our 1/4" Tygon tube from there to the JMP UHF air trap.

olnico

I have created a line of 5/16" or 8 mm ID fuel accessories for military and industrial projects.
We found out that 1/4" ID was a bit on the limit for 1000 N and more engines.

You will find these accessories under the label " XHF".
The following are available:
Tygon fuel line, Viton clunk line, clunks, fuel stoppers, brass tubes, fittings and bulkhead fittings.

The following nomenclature is used on our web site:

NF - 1/8" - 3.2 mm ID for engines below 160 N
HF - 3/16" - 4.8 mm ID for engines from 160 N to 200 N
UHF - 1/4" - 6.4 mm ID for engines from 200 N to 500 N
XHF - 5/16" - 8 mm ID for engines of 500 N to 1000 N and more.