Engine preheat - that travels with you

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A2022
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Re: Reiff Hotstrip sump heater

Post by A2022 »

engine preheat from the aircraft fuel tank test 3, for one hour and engine start. electrical power for preheat is from the installed Concorde battery. the battery starting cranking power was very strong. perhaps the strongest ever. two passing blades and it was started. it must have something to do with the heater 2 Amp-hr usage prior to start. this preheater unit is good to go and ready for deployed operation at a far off lonely cold airport. fuel is avgas from the tank, electrical power is from the installed aircraft battery. you don't need to carry anything but the heater (6 lb) and a duct. I am very happy with this setup!

setup time to be ready for preheater start was 4 minutes and 11 seconds at a relaxed pace. this includes connecting the duct, siphoning fuel to the cup and connecting the fuel and electrical power.

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Steve Melton
N531EM, RV9A, Superior O-320, WW 200RV prop, Slick mags, CHT 330F, EGT 1300F, B&C, 1300+ hours
Freedom and Democracy are all that really matter.
Ride a bike, unlock the world.
https://www.rvplasticparts.com/
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A2022
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Joined: Sat Mar 05, 2022 8:52 am
Location: Cincinnati, OH
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Re: Engine preheat - that travels with you

Post by A2022 »

well, at least I met the weight goal of 10 lb for the total preheat system. all the wire and fuel tubing are stuffed into the duct. I could probably reduce the weight by .5 lbs by reducing the extension wire gauge, 10 AWG is overkill, but the preheater start is quick.

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Steve Melton
N531EM, RV9A, Superior O-320, WW 200RV prop, Slick mags, CHT 330F, EGT 1300F, B&C, 1300+ hours
Freedom and Democracy are all that really matter.
Ride a bike, unlock the world.
https://www.rvplasticparts.com/
https://www.gpsdock1.com/

User avatar
A2022
Class B
Posts: 1831
Joined: Sat Mar 05, 2022 8:52 am
Location: Cincinnati, OH
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Re: Engine preheat - that travels with you

Post by A2022 »

engine preheat from the aircraft fuel tank test 4, for one hour using aircraft electrical power. 236 mL (8 fluid oz) fuel burned, AMAZING, check my math. the more I use this system, the more I like it. carbon monoxide = 19 ppm max, holding it in from of the exhaust (hot). a fan was used to simulate wind, and the heater was not affected in any orientation with the simple air inlet. a zip tie will keep the oil door closed in the wind. I am focused on the wind, because I have been there before, and you will have wind (many trips to Kansas). I would feel comfortable enough after starting this system to walk back into the FBO on a windy day to have a coffee. That's the GOAL!

Steps:
1. place heater on floor under fuel cap.
2. siphon fuel to cup and then connect fuel line to heater and move heater to final position. you will spurt some fuel making the connection, then move the heater.
3. remove fuel bung from tank and place in cup and close lid and place cup at wingtip in the support base.
4. connect duct work and electrical power (cord over the propeller) and press start

times at 12C OAT:
0. setup preheater to aircraft = 194 seconds
1. glow plug raises to temperature and fuel begins pumping at 75 seconds after pressing start
2. heater starts and raises to full power 210 seconds after pressing start
3. upon shutdown, the unit will cool for 220 seconds after pressing off

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Steve Melton
N531EM, RV9A, Superior O-320, WW 200RV prop, Slick mags, CHT 330F, EGT 1300F, B&C, 1300+ hours
Freedom and Democracy are all that really matter.
Ride a bike, unlock the world.
https://www.rvplasticparts.com/
https://www.gpsdock1.com/

User avatar
A2022
Class B
Posts: 1831
Joined: Sat Mar 05, 2022 8:52 am
Location: Cincinnati, OH
Contact:

Re: Engine preheat - that travels with you

Post by A2022 »

fuel cup base.... what about some heavy soft natural rubber bonded to the lower surface of the base.


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quick and dirty print, but with a perfect line fit and printed in 1.5 hrs.


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Steve Melton
N531EM, RV9A, Superior O-320, WW 200RV prop, Slick mags, CHT 330F, EGT 1300F, B&C, 1300+ hours
Freedom and Democracy are all that really matter.
Ride a bike, unlock the world.
https://www.rvplasticparts.com/
https://www.gpsdock1.com/

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