If it gets even a little hot without the piston being cut it will seize. to a gallon is going to burn that engine up before long. Tater xx 3 blade it's great prop for this stock 26cc.

It starts after the first prime and runs greats for only having 1 full bag of fuel through it. I'm wondering if the engine is running to lean?. There is water flow through the cooling line. The only problem I'm having is I keep burning through exhaust o-rings on the tuned pipe. I need to upgrade the steering servo it's not up the job even on 6v's. Single fuel line with a du-bro quick fill.2.4 radio. That small vent hole was stinking up my house after running. Ditched the plastic fuel tank fora IV bag. I upgraded the rudder to the aeromarine one ( single ).

That sucker spins good on 24v and doesn't even balk at starting that zenoah.

Only quick short bursts on the 12v starter or you'll grenade the armature. I use my hobbico 90 starter to start my airplanes 60 size and also to start my 55' gas boat which had a pull start zenoah 26cc converted to a starting belt so i can use my starter for both. So I got 2 12v field box batt's and a toolbox and wired them up. 14.000 now and with the 1,6 pitch prop it was aprx 12.000 so I have gained 6 -8 km/t with the smaller prop and the engine will last longer and not become as hot as it did with the larger prop. I guess that the rpm on the enine is aprx. ok you can still hear that the rpm raises a bit when the boat gets airborne but not a raise in rpm compared with the 1,6 prop. it sounds nice and hits just above 74 km/t / 46 mph. Then I have a 75 x 1,4 and that is the prop for my boat with std. when i hit a wave and the prop gets some air the engine gains a lot of rpm's and slows down when it hits the water again. Then I have a 75 x 1.6 2 bladed that works fine but you can hear that the engine don rev up to maks. I have a nice 3 bladed 67 x 1,5 prop for my boat and it cavitates and is not usefull for my boat but other boaters find this prop super for their specific boat. on the engine or simply by trying 3 or 4 different props and have a gps ready. It is estimated and the only way to find out these things is to use a device that mesures the rpm. now the rpm on the engine will drop a bit and the slip on the pro will encrese a bit.Įstimated: 70 x 1,6 x 12.000 x 60 - 15% : 1000000 = 68,5 KM/T or 43 mph. 15% (less on a small pitch and more on a high pitch) divided by 1000000 (estimated or sured) x minutes in an hour (60) - prop slip aprx. If you calculate the speed in km/t it is done this way: diameter on prop x pitch x engines rpm. I think that the x470 or x 472 will work better than the x 670

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