Diy turboshaft engine

[azwood]

youtu.be/PsrOeWgg2Pg here's hocxzxzaZqfzbhgggdcvv

[azwood]

Having issues with keeping the volts up enough to run the blower for starting its fine with a 2nd battery connected but not great with one.what's my options with battery's that arnt huge but have good life?

[azwood]

OK so just fired her up with two batteries. But had a very Scarry experience there was some unburned diesel in the chamber from the last run and it got away from me there was nothing I could do but step back and watch I've never seen it screen scream like that holy sh#t hope everything's OK I'll need to pull it apart and check her over.no parts flew out but I'm worried something's been damaged. Anyone running wet fuel please be careful trust me you don't want to witness this I'll be making a fuel drain now I may even mount the chamber upright.

[azwood]

So I've pulled everything apart and things look OK I'm Lucky if anyone has a good idear of how to make a good drain point let me know I ha e a catch can I was just going to use a 12v solenoid to clear it when I'm using the starter blower.

[turboron]

azwood, it is interesting the Frank Whittle had a similar experience on his first jet during development. Most aircraft gas turbine engines have a simple spring loaded valve at the low point of the horizontal outer combustion case(OCC). The spring holds the valve open during shutdown and compressor pressure forces it closed during operation. I think I was just going to use a ball check valve for the application.My thought for our sore thumb combustors is that the sparkplug end of the OCC should be the location of the valve. Rotate your combustor slightly to put that end of the OCC below level so that the fuel collects there and runs out of the valve.

Thanks, Ron

[racket]

Hi Aaron

The drain hole only needs to be a smallish diameter , 5 mm , so you can use a very small cock , I've used small brass fuel cocks with 1/8" BSP thread on them , if the drain hole is small it doesn't affect running even if inadvertantly left open .

I tried using a spring loaded one like Ron suggested for my 2 shaft kart, but found after some use it started to stick open from bits of carbon getting under the seating , and rather than persevere with that design I went back to using a simple brass cock on subsequent engines.

Cheers
John

[azwood]

Thanks guys i ill do decently do something I can't have it running as at again imagine if I was driving Scarry lol.

[azwood]

Its probly overkill but I've made this catch under the chamber to collect any unburned diesel the on shutdown I just hit the solenoid button and will go to the alloy one

[azwood]

Finally got a thermo fan on it I need to get a temp switch does anyone know what temp the fan should turn on most of them are between 70/100 degrees.

[turboron]

azwood, there are a lot of variables such as the type of oil etc. My thought is that you want the oil going to the bearings to be approximately 150 degrees F or less. The oil out of the bearings should not exceed 350 degrees F.

Thanks, Ron

[azwood]

Dec 9, 2018 7:44:09 GMT -5 turboron said:

azwood, there are a lot of variables such as the type of oil etc. My thought is that you want the oil going to the bearings to be approximately 150 degrees F or less. The oil out of the bearings should not exceed 350 degrees F.

Thanks, Ron

Yeah 350 would be dam hot

[azwood]

Maybe I should use a Davis Craig switch

[turboron]

azwood, I just use a regular toggle switch. I switch the oil blower on before starting and shut it off after cool down.

Thanks, Ron

[finiteparts]

Hi,

The nice thing about Cummins/Holset turbos is that they provide installation data in the service manual...your HX55 can be found here...

www.myholsetturbo.com/manuals/HX50_52_55.pdf

If you go to page 1:4, you can see that the normal operating oil temperature is 95 deg C and not to exceed 120 C. The minimal oil pressure required during full speed operation is 30 psi and the maximum pressure should be 58 psi once the oil is up to temperature. Then finally, you should be targeting a oil flow rate of 3.5 to 4.5 liters per minute.

I hope that helps!

Chris

[finiteparts]

Also...if you look up the oil recommendations for the oil use in the Cummins M11 that uses the HX55, they recommend using SAE 15W-40 for any ambient temperature above -15 deg C.

- Chris