DVII for sale

Jeff Brooks · 12 February 2008, 12:06 PM

Nice, I am not that knowledgeable about all the different methods of welding. So I thought I would ask. My limited knowledge is just gas, and when I weld outside of a jig that holds a part's shape ... it distorts the shape completely.

zffltd · 12 February 2008, 05:34 PM

Quote:

Originally Posted by Jeff Brooks

Nice, I am not that knowledgeable about all the different methods of welding. So I thought I would ask. My limited knowledge is just gas, and when I weld outside of a jig that holds a part's shape ... it distorts the shape completely.

That is gas lots of heat for welding create deformation.

Pavel

zffltd · 12 February 2008, 07:02 PM

Hi all
I have some thing in mine.
The brazing wire used commonly for brazing aircraft sructures supply by McMaster P/N 9666K is very pure quality the tensile strengh is listed 195,000 up 247,000 PSI. As this wide range the wire is purely made and will be fatigue with out warning. The next this wire was introduce on market in 1930's long after WW1. Carbon steel wire was in production in UK at that time and used heavy gun production only.
Presently I'm doing some testing and consulting with engineering which type of wire will be best to used for brazing structures. The wire which I have is 125,000 to 145,000 PSI and have 17% memory. Piano wire dos not have any memory and usually brake in flight!!! Also the best way to avoid a braking of the piano wire will be use cable eye's.

Thanks for different inputs.

Pavel

Jeff Brooks · 15 February 2008, 06:15 PM

Hi All,
Here is the fuel tank I asked Pavel to make for my plane. This tank is fabricated referencing the Kiger drawings. I asked Pavel to modify the tank for the fuel system I posted on my thread. If you are interested in where all the fittings go, go to my thread, My Fokker DVII Project post #684. The modifications are posted on My Fokker DVII Project post # 702.

Jeff Brooks · 15 February 2008, 06:19 PM

Needless to say, I'm excited to see these pictures. One of the things he has including is the fuel quantity indicator. Although if someone has an original they are willing so sell ... I am looking!

Garfield · 15 February 2008, 07:28 PM

this looks like an early D7 tank with the oil tank in the center . If yes why do you like to have hot oil in the fuel tank , what heats up the fuel to the oil temperature ?

Jeff Brooks · 15 February 2008, 07:39 PM

The tank is intended to be an early DVII tank, with the oil on the right side(viewing from the pilot's seat). The reserve tank should be between the oil & main tank. I believe this was how the original early version was.

Garfield · 15 February 2008, 07:52 PM

the early tank was made like this , but the Mercedes and BMW had a different oil system . There was no constant oil flow from the engine to the tank and back to the engine like your ranger has . The mercedes has the main oil tank in the engine and only takes from the oil tank what is missing in the engine . You have a dray sump engine , and hot oil returns to the tank all the time heating up the fuel . Your engine oil has 80 celsius , after a wile the fuel has 80 celsius .

tengew · 16 February 2008, 08:08 AM

good point jeff you dont want to add heat to your tank

Dogtail2 · 16 February 2008, 11:29 AM

Same problem with the original Dr1 fuel tank which has a lengthwise divider seperating oil and fuel. Other areas of concern with the Dr1 tank:-

Leaking from oil side into fuel side and vice versa. Might go undetected until the engine quits.

If a leak is detected in the divider, the whole tank has to come apart to repair it.

The original method of mounting the Triplane tank on four brackets riveted to the sides of the tank and suspended from the longerons looks to be a good way to induce cracking of the tank sides. May be better if not aluminium, I dont know.

My tanks will probably be separate units thus:-

These will be sat on wood bearers with steel straps over.

I would be interested to hear from anyone who has experience with the tank in its original form or otherwise.