Oops!

On my Pegasus version the mast is adjustable I will start with a taller than scale rotor head then see how it goes
Joe

Bill,
To make up a 2" differential is going to need a hell of an angle alteration to make it in line with the CG position . Something I wouldn't try myself but I have never tried it so cannot comment. If one of my fixed wings were nosing down I would try to find another way around things rather than adding up thrust to try to over come the problem. Plus in theory the thrust of the motor will alter in relation ship to the rotor flying angle?

Joe,
I would go with blade 'C' if it were me, with the AUW I would aim to at least get the thrust line in line with the CG with a tolerance of no more than 5mm above.
I played with this gap last year with REX and the only way I could control the pitch down under power when the gap was increased was to increase the rotor length. I tried AB blades at a shorter length and this did not work, so it seems the gap can be increased but its drag at play that is counteracting the upper thrust line. This was done with only a 2 blade set up so it may well be different with 3?
With a full tailplane the thrust line is not so critical as it acts as a damper, the further it is away from the prop the more it can control it. My Tempest thrust line is 3" -4" above the CG and that flies fine, but it has a lot of tailplane area. I am not sure it would dampen a thrust line under the CG though?
Dave needs too loose some weight around the top and increase it some how lower down I think.

Hope the info is of use?

Regards

Rich

Thanks Rich looked forward to your input
Dave is following this thread so he will take action on any advice as will I and I will update
Joe
No snow no wind not too cold going flying

Originally Posted by Jockadopolus

No snow no wind not too cold going flying

Oh just rub it in! Bring a video camera so I can pretend I'm flying with you!
Joe

If we cannot get them to fly we have a back up plan here are some conversions we are considering
Joe

Others under consideration

Bradley Aircraft Back Pack Gyrocopter (0 min 21 sec)

NASA Spiral Duct ESTOL Concept (0 min 58 sec)

i like the wind bag but than again my wife calls me a wind bag lol i like the mold ideal

Started to build a vac form table and heating box last week but been laid up with a bad back so very little done
Building this kind of box

Vacuum Forming with your Kitchen Oven and Vacuum Cleaner (2 min 56 sec)

And this heating box

XRobots - How to build a vacuum forming machine including my easy heating solution (9 min 5 sec)

Joe: Those videos make it look so simple. Hope your back is feeling better, nothing more frustrating then trying to work around a nagging backache. I have managed to get a separate motor and shroud UNIT built that I can move up and down on the back of the fuselage about an 1&1/2" or so. worried about weight too, maybe a vacuum mold of the shroud would be the way to go but I don't have the resources to do that,besides mother is still looking for her shade.So using the oven is out of the question!

Bill

Looking good there Bill! I like how you'll be able to move that assembly anywhere on the firewall. Lots of flexibility.
Hey, you don't have to use the oven. With a little practice, you can heat the plastic right over the stove and hook mama's vacuum to the box! LOL

DC

Bill
The back is on the mend a couple more days with pain killers
The small pieces I made with my small vac box worked OK and is good practice for something bigger
My body plugs are to large for the oven that's why I need to make a heater box saves any fall out from the Mrs
I like your modular shroud set up that should give you plenty adjustment of the thrust line
Joe

Bill looked at my model and we may have to adopt your motor and shroud idea to get the thrust and cg position
Joe

Unable to do any building so been searching the net for future projects
Found a few more ducted prop gyros and a few interesting models I haven't seen before
Joe

Once again Joe....how do you find these gems! I like the second one (silver and red) and sort of drawn to the white, gold and green one (number 8).