Engine basics > Four strokes only

4 stroke bislob?

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bob branch:
Has anyone tried to fly a bislob with a 4 stroke? I am doubtful about it because it seems like the guys who really do them well with 2 strokes set them pretty rick and they transition to 2 stroke mode to lock into  the hover. Seems like the 4 strokes constant run would negate that ability. Anyone have any experience?

bob branch

Robert Zambelli:
I nominate Bob Branch to try a 4-stroke slob.

Anyone second?

Seriously, Bob - I have never seen it done but a test is worth one thousand expert opinons. If you have the means, give it a try. Might be a whole new experience.

Bob Z.

bob branch:
Bob

The reason I asked is because of the other power system not already mentioned. I have been pretty much all electric for a couple of years now under Rick Sawicki's toutalage. The Adamisin clan has also worked with Rick and myself and we have had discussions among us about the idea. I think Dennis has one under way. My concern is the same with electric. With our governor systems the motor just keeps pouring on power to hold constant rpm, more like a 4 stroke runs. Though we do get a big increase in power in doing that, much like a tuned pipe but much faster and essentially the power increase to hold rpm is only limited by the power available in the system. Since we are able to download the data with some of the systems we can see the percentage of power we are using, optomize our power draw to the power available which will be different with each battery, motor, prop configuration, even with different line lengths. I've got a NIB saito 40 that has been wanting a home and thought I would see if anyone has done it. I fly a lot of 3D in RC and the way the old fox .35's 2-4-2 is just ideal for it.  I think the answer to it in electric will eventually come from the fully active power control systems like those the europeans used at the worlds this summer are developing. Still the electric and 4 stroke systems have a lot in common so I'm bassically surfing for info.


But of course there is still that Saito in the box.

bob branch

David Shad:
Why not the four stroke with a three line system and then you can use the throttle control to play with all that power and torque...

bob branch:
I think after a bunch of loops you will have an uncontrolable mess with a 3 line system won't you? I have never flown one so I don't know how much they will handle and still function. But in this kind of flying you are not doing a pattern that unwinds itself. Thing can get pretty twisted and happen very very fast.

please don't take this as an all knowing bit of knowledge. I don't know, I am basically asking.

bob branch

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