|
Post by wannabebuilderuk on Jan 29, 2024 15:31:04 GMT -5
Thinking about instrumentation/controls now, got oil temp/pressure gauges, an egt gauge, a p2 60psi gauge, a 1000psi fuel gauge, main power key and relay, fuel switch and relay, oil switch and relay.
What else would I want on the control panel, battery volt meter perhaps?
|
|
|
Post by wannabebuilderuk on Jan 29, 2024 16:34:05 GMT -5
Crude but working progress
|
|
|
Post by wannabebuilderuk on Jan 30, 2024 15:18:52 GMT -5
Some more refined CAD lol
|
|
|
Post by Johansson on Jan 31, 2024 15:01:35 GMT -5
Make sure to have an oil pressure switch, that cuts the power to the fuel pump if the oil pressure gets too low. There are nice adjustable ones on Ebay pretty cheap.
|
|
|
Post by wannabebuilderuk on Jan 31, 2024 17:54:09 GMT -5
Make sure to have an oil pressure switch, that cuts the power to the fuel pump if the oil pressure gets too low. There are nice adjustable ones on Ebay pretty cheap. Got an adjustable one a while ago, it's mounted on the sensor rail along with the temp/pressure sensors you can see on the left ibb.co/yd0v4QP
|
|
|
Post by Johansson on Feb 1, 2024 0:20:38 GMT -5
Perfect!
|
|
|
Post by wannabebuilderuk on Feb 1, 2024 8:06:38 GMT -5
For the spark plug is the tip inline with the inner surface of the flame tube or is it sticking in a couple mmm? Going to put it roughly on the X where the primary holes are just need to work out the depth.
|
|
slittlewing
Senior Member
Joined: November 2017
Posts: 458
|
Post by slittlewing on Feb 1, 2024 8:40:09 GMT -5
Spark plug I would mount so the end of the threaded body is inline with FT ID. Tip will therefore be 2mm inside or so. On my Jetbike I had a problem with the tip melting off - solved by removing the tip and allowing it to spark sideways. I can also highly recommend NGK BUE surface discharge sparkplugs if you have a close enough distance from your Outer can to FT (the thread is not super long on them).
Cheers
Scott
|
|
|
Post by wannabebuilderuk on Feb 1, 2024 8:56:19 GMT -5
Spark plug I would mount so the end of the threaded body is inline with FT ID. Tip will therefore be 2mm inside or so. On my Jetbike I had a problem with the tip melting off - solved by removing the tip and allowing it to spark sideways. I can also highly recommend NGK BUE surface discharge sparkplugs if you have a close enough distance from your Outer can to FT (the thread is not super long on them). Cheers Scott Got an aircraft plug which are surface discharge from andym held in place with a compression fitting however looks like I have just enough length to be inline with the FT wall id and not a hair more lol
|
|
|
Post by wannabebuilderuk on Feb 3, 2024 9:02:39 GMT -5
Box arrived and looks like a perfect fit, compact enough for that aviation look but enough room for no awkward wiring. Putting an extra 4th switch for electric start if I get around to finding a suitable motor or maybe afterburner.
|
|
|
Post by wannabebuilderuk on Feb 3, 2024 14:31:36 GMT -5
Box mounted nicely
|
|
|
Post by wannabebuilderuk on Feb 4, 2024 9:12:48 GMT -5
Hi guys, does anyone know what the min rpm would be to begin to self sustain? Like the minimum you'd need for an electric motor to start an engine, I'm thinking maybe 20/30k?
Got 5 toggle switches so thinking it's worth putting all on the control box even though I only need 3 for oil/fuel/spark but was thinking of maybe using one of the spares for electric start and one for afterburner/smoke system depending how much of a jerk I want to be to the neighbours 😂
|
|
richardm
Senior Member
Joined: June 2022
Posts: 276
|
Post by richardm on Feb 4, 2024 9:54:24 GMT -5
I would say about 10 to 12 % of the max rpm rating at a minimum. At least that's what is required on a real turbine. Obviously the electric motor has to be rated at better rpm cause of lower rpm under load.After ignition the motor should feel a decreasing load and get to speed helping the engine spooling up
|
|
|
Post by wannabebuilderuk on Feb 4, 2024 14:55:29 GMT -5
|
|
|
Post by racket on Feb 4, 2024 15:48:14 GMT -5
30K capability for the starter , you'll need at least 20K to get near self sustain , the extra 10K will see you "over the hump"
|
|