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Ripmax P51D Mustang Conversion to 4 Stroke

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Ripmax P51D Mustang Conversion to 4 Stroke

Old 08-25-2013, 08:44 AM
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Default Ripmax P51D Mustang Conversion to 4 Stroke

I've just finished converting the Ripmax 48" Mustang to house an OS 40 Surpass. Straight forward installation with the CoG working well using a 5 cell NiMh sitting back next to the Elevator and Rudder servos. Only reservation is the rocker cover poking out of the bottom. I installed a 1/8th length of piano wire to lift it off the ground - hopefully it will be OK. Maiden is tomorrow if the weather holds out. I was initially considering a 25FX which would sit inside the cowl but I plumped for the 4T as it sounds nicer

I used a 4oz tank that lasted approx 10 mins on the bench with a mix of half and 3/4 throttle although this was the first run so was rich. Times should improve

--
Mark
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Old 08-25-2013, 10:50 PM
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Cylinder heads and mufflers hangin' out in the breeze has always been part and parcel of glow engine powered planes.

You did a great job, looks fantastic!
Old 08-27-2013, 12:08 AM
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Well she flew. Quite abit tail heavy which surprised me as as it balanced spot on with the stated COG at 90 - 95mm and considering I had the 4T up front. I had to add 100gams of lead to the nose and a bit of down elevator for her to fly level hands off. There may not be enough down thrust atm as she also wants to dive when inverted. A couple of washers behind the mount and another test flight soon to see if it sorts it out.

There was no need to throw to launch - it leapt out of the hands with the 40 4T up front

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