MDS .68 Fuel/Prop Suggestions
05-28-2003, 06:50 PM
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MDS .68 Fuel/Prop Suggestions
I just ordered an edge 540 .60 from horizon 
. I have an mds 68 and was wondering a few things about it. This engine came out of a heli and has been run on 30% Cool Power for as long as I owned it, It ran well in the heli although at times a bit troublesome to tune, but when tuned properly it produced nice power. My first question is should I keep running the same fuel or should I change? The owners manual recomends 15-30% I'm going to be using the muffler off my os .61 cause I had to buy an in cowl muffler for the os, so I might as well put it to use. The other thing I'm looking for is prop suggestions I want to have enough power to go vertical with the edge I was thinking about getting a 12x8 the only engine I have that is close is an os .61 FX which I have a 12x6 on, and by the specs the mds should have quite a bit more power then the os. I know Hp dosn't always equate into better performance but I think the specs on the os are 1.9Bhp and the mds has 2.5Bhp. this should leave some room for more pitch or a larger prop I'm new to the bigger engines so any suggestions would be helpful
Thanks
. I have an mds 68 and was wondering a few things about it. This engine came out of a heli and has been run on 30% Cool Power for as long as I owned it, It ran well in the heli although at times a bit troublesome to tune, but when tuned properly it produced nice power. My first question is should I keep running the same fuel or should I change? The owners manual recomends 15-30% I'm going to be using the muffler off my os .61 cause I had to buy an in cowl muffler for the os, so I might as well put it to use. The other thing I'm looking for is prop suggestions I want to have enough power to go vertical with the edge I was thinking about getting a 12x8 the only engine I have that is close is an os .61 FX which I have a 12x6 on, and by the specs the mds should have quite a bit more power then the os. I know Hp dosn't always equate into better performance but I think the specs on the os are 1.9Bhp and the mds has 2.5Bhp. this should leave some room for more pitch or a larger prop I'm new to the bigger engines so any suggestions would be helpful Thanks
05-29-2003, 12:22 AM
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MDS .68 Fuel/Prop Suggestions
The MDS 68 is not necessarly any more powerful than your 61FX. The standard prop for it should be the 12-6. but for 3D type you could go to a 13-5 or even a 14-4. With your plane, the 14-4 may not give you enough speed.
10-15% nitro is plenty in the MDS 68. I wouldn't use 30% heli in it.
Forget all those horse power numbers you quoted. I doubt those for either engine were correct?
Jim
10-15% nitro is plenty in the MDS 68. I wouldn't use 30% heli in it.
Forget all those horse power numbers you quoted. I doubt those for either engine were correct?
Jim
05-29-2003, 12:44 AM
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MDS .68 Fuel/Prop Suggestions
Thanks, I doubt they are correct either but they are what the factory specs them at. I'm not really concerned with speed, but I do want enough pulling power to go straight up. I've been reading the edge thread and everyone seems to have at least a .91 4-stroke will I be underpowered with this engine? the kit says 60-90 2-stroke but the thread seems to suggest even the 90 are not enough power. I only want this plane for normal aerobatics not anything extreme or 3d, but I would like enough power to stay out of trouble.
05-29-2003, 12:56 AM
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MDS .68 Fuel/Prop Suggestions
I run one of my MDS 68s with a 12x6 and the other on a 11x7.5. I agree with w8ye that a 13x5 or 14x4 would provide you more thrust but at the expense of top speed.
BTW, 10-15% nitro is all you need.
BTW, 10-15% nitro is all you need.
05-29-2003, 02:34 AM
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MDS .68 Fuel/Prop Suggestions
0 to 5% nitro, 14x6 MA K series with a MCP at 10.5K. I have a 8.75# stick like fun-fly that has unlimited vert. I switched to the Mag .91, MCP, and a 16x6 and everything is better.
I just looked it up on their website.
Edge 540 .60 Specifications:
Wing Span: 63.75 in (1620mm)
Weight: 8 - 9 lbs (3.6 - 4.0 kg)
2 Stroke Engine Size: .61 - .90
4 Stroke Engine Size: .91 - 1.20
Radio: 4-channel
# Servos Required: 5
A MCP would not look good on this bird. For that kind of performance from a 9# plane with stock exhaust, you better go with a .91. If you do, get a Mag, I have 2 .91's and 5 Mags total. Never had a problem, and they run great.
I just looked it up on their website.
Edge 540 .60 Specifications:
Wing Span: 63.75 in (1620mm)
Weight: 8 - 9 lbs (3.6 - 4.0 kg)
2 Stroke Engine Size: .61 - .90
4 Stroke Engine Size: .91 - 1.20
Radio: 4-channel
# Servos Required: 5
A MCP would not look good on this bird. For that kind of performance from a 9# plane with stock exhaust, you better go with a .91. If you do, get a Mag, I have 2 .91's and 5 Mags total. Never had a problem, and they run great.
