Originally Posted by gdryer

I look forward to following your progress.

How comfortable are you with only a single point of failure for the ailerons? Maybe the question to ask is when when was the last time you had a servo failure in an IMAC plane?

Well, I don't know, I guess there are two ailerons so even if one goes you could still land the plane. So far no servos have failed me, it's chance I'm willing to take

Henry

Looks really good . you do very nice work .

Bryon

Originally Posted by buildingjets

Looking forward to seeing your cored out Wings , Stabs ect. . Do you have any pictures of your last cored Wings ? Did you use C.F. in them ?

I don't but I will post pictures of this one for sure. I use a full length tapering CF spar top and bottom.

what does the 1/2 degree of positive incidence give you in flight characteristics?

Originally Posted by gdryer

I look forward to following your progress.

How comfortable are you with only a single point of failure for the ailerons? Maybe the question to ask is when when was the last time you had a servo failure in an IMAC plane?

we all fly with one elevator servo so i don't think it makes it any more of a problem when having one aileron servo

i fly with 4 elevator servos.......just sayin

Originally Posted by Henry Piorun

Well, I don't know, I guess there are two ailerons so even if one goes you could still land the plane. So far no servos have failed me, it's chance I'm willing to take

if you had on aileron servo fail in a 2 servo aileron setup, the chances are is you would burn out the second servo before landing. if one servo went to full lock, the other servo won't have any affect and will likely fail also. the only way i could see it working out well, is if one servo failed and went completly inactive and had no binding at all.

having a servo fail and not lock hard over is pretty unlikely. multiple servo's on a control surface are not for redundancy, they are to achieve an appropriate force for function. Im with you on this james

Originally Posted by planecajun

having a servo fail and not lock hard over is pretty unlikely. multiple servo's on a control surface are not for redundancy, they are to achieve an appropriate force for function. Im with you on this james

I agree guys, having a servo fail on your ailerons would be immensely crappy wether you have a 2 servo set up or one servo per aileron. It's just something I want to try on this plane, the ailerons will be a lot smaller and I think a 500+ oz servo should have no trouble handling the flight loads. Anyway this has already been tried and it sounds like it works just fine. Having siad that I'm not completely married to the idea and if there are some unforseen problems I might just go to 2. I'm not at that stage yet anyway.

Originally Posted by planecajun

what does the 1/2 degree of positive incidence give you in flight characteristics?

Well first let me say that either set up works and I'm not trying to convince anyone that one way is better than another way. However my theory on this is, a 0-0-0- degree set up with a symetrical airfoil does not produce any lift. To make this airplane fly you need to dail in up trim so you are making the whole plane fly on a slighly positive angle of attack. That means for level flight you are actually flying with a bit of up thrust.
I just prefer to set the wing slighly positive, it's not super critical 1/4 to 1/2 a degree is all it takes, I usually aim for 1/3. I set the engine with a slight bit of down thrust, again right around 1/3 of a degree. If it's done right the plane flies with a perfectly neutral elevator. I just find it's easier to trim the plane for vertical up lines with this set up. Most pattern planes have been running this set up for years.

COOL.......Good info to know. I've never owned any pattern planes and have no experience with them. I can see now how this would make sense. Thanks for sharing.

This will be a build I will follow,,,,,,,Henry, you best keep some secrets or patent them!!


Practice your knife edge,,,hehe

Originally Posted by Henry Piorun

I agree guys, having a servo fail on your ailerons would be immensely crappy wether you have a 2 servo set up or one servo per aileron. It's just something I want to try on this plane, the ailerons will be a lot smaller and I think a 500+ oz servo should have no trouble handling the flight loads. Anyway this has already been tried and it sounds like it works just fine. Having siad that I'm not completely married to the idea and if there are some unforseen problems I might just go to 2. I'm not at that stage yet anyway.

Hey Henry, stick to your guns! I'm going with one servo on my Carden PRO Special with shortened ailerons. Using the SBus analogues to the bls157 (can't remember the servo number). Your bio is very similar to mine, I'm 52 and have been flying the same amount of time with pattern in my past too. I did add a second servo well in my wing but first I want to see how it handles Advanced and Unlimited this spring. My build is in the Giants forum on RC Canada. Looking forward to yours

BTW, in thousands of flights, the only servo failures I've ever had were connectors vibrating out of a receiver (once) and a solder connection breaking (once) and both times the plane was a little dicey, but landed without incident. I think sloppy setups and mismatched geometry cause far more problems for some and also cheapening on quality will bite you over time.

Originally Posted by capcanuck

BTW, in thousands of flights, the only servo failures I've ever had were connectors vibrating out of a receiver (once) and a solder connection breaking (once) and both times the plane was a little dicey, but landed without incident. I think sloppy setups and mismatched geometry cause far more problems for some and also cheapening on quality will bite you over time.

Hi Lee
I agree, I can't remember the last time a servo actually stopped working. I know it happens but like you say, there's probably a good reason for it.