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I use a black Master Airscrew 8x6 prop on my little OS .10 FP that turns 10,500 RPM, two oz tank and 36 oz all up weight. Very good power! It is quiet with 21 inches of pipe to the rear of the plane and I did not remove the OS muffler mute. This long pipe means no mess and it only costs 200 RPM This plane is covered with Ultra Coat. A mini gyro is required to tame the strong ground looping tendencies of this aircraft.
This is my Ofna ultra mbx diesel P4 .21 buggy. I can race this in grass all day........never gets hot!!
I'm turning 5" truck tires with a 16 tooth pinion. Power is awesome!!
This is my Nitro elements Artattack 1/4 scale diesel sled. OS RFB .21 converted to Davis diesel. This is one of the best conversions to diesel I have ever experienced! As a glow........there was just to much drive train load on the engine. As you drove it longer, the more the drive train robbed the engine of power......and soon would overheat and shut down. There wasn't anything to change as far as gearing, it is a fixed 4:1 ratio. The conversion to Davis diesel was the ticket! I can run this engine slow and it pulls the sled like a dream! I have had it clocked at 41 mph with very cool running temps and very reliable!!
As promised I am sending photos of my current trainer aircraft. Its a Ace Whiz 40 with an OS 46LA up front. Prior to converting the engine to diesel I was turning a 10x7 prop and performance was adequate.
With the conversion, I am currently turning a Grapner 12x8 three bladed prop and getting about 10,000 on the tach. It turned an OK plane into a great flying model! T
he black rubber hose is automotive fuel line. Initially, I had a piece that ended just below the landing gear and ended up with an oil covered tail. By lengthening the hose so it is just outside the prop wash, I get little to NO mess on the fuselage!
The tank is a Dubro 6 ounce tank and I'm getting 15+ minute flights. Takeoffs & climbouts can be accomplished with half throttle with the tail coming up immediate upon applying inital power. I fly an easy pattern at 1/3 throttle. The only downside is I am drowned out by the noise of normal glow engines flying in the pattern and often think I have a deadstick.
Everyone is curious and impressed with the diesel conversion and have been reminded a few times to put the glow charger while turning the engine over, when the engine catches, I just smile.
I also have a Sig LT40 with a Grapner 11x7 3 blade prop on a OS46LA as well. It had a 12x8 and flew extremely well. The only problem is some aircraft like the LT40, can't take a too long a blade due to ground clearance. With the LT40 I was flying a 12x8 but was often experiencing prop stikes on landings. The beauty of the Ace Whiz 40 is its long wide gear that accomodates a big prop.
Another difficulty I am having is that many prop manufacturers drill a too large hole on their props as a glow would need a bigger engine.
Right now, I have an 1/5 scale 80" span eindecker with an OS61FX up front on the building table. I am looking forward to see the performance I'll get with a 16x6 prop. Also in the works is a Sig Four-star 60 with a OS46FX with a MAC header and tygon hose going through the fuse and coming out by the tailwheel. I have a CAP 21 cowl on the Four-Star. Because of the smaller sized engine there will be no cylinder head or muffler sticking out to ruin the look of the aircraft. Diesel, to me, seems to be s a natural choice for anyone comtemplating a scale design.
I'll have more photos as they are done. Thanks for a great product.
Send this picture to ALL new diesel customers. After my first empty Davis gallon I soldered DuBro fuel can connectors thru two holes that I drilled into the cap (using the supplied nuts for extra strength. There is a brass tube to the bottom of the (with 45% bevel on the bottom end) can that the yellow tygon tube attaches to. The black neoprene connector only goes in an inch. I disconnect the filler nipple from the black tubing and 20 cranks (6.5 oz) later I reconnect to the black tubing and fly. My fuel does not go flat! No more messing around with pouring fuel from the gallon to a smaller container. Even the last third gallon can that sat in my garage all winter. I've been flying diesel for four years now; I wish someone had shared this with "ME" when I started. In the summer time I also put my gallon fuel can in a bucket with whatever "blue ice" pieces I can also fit in the sides.