David Oatham
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Everything posted by David Oatham
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Thanks Richard, that's all very helpful. I'm glad you mentioned the vertical CG as that was my initial query. How can you locate / estimate the vertical CG on a tractor model?
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Thanks for your reply Big T. Yes I am aware of the hang angle as I have built an Atom in the past. The other factor that I'm unsure of is how much motor downthrust is required? I assume the right motor thrust is looking from behind, and as a 'dyed in the wool' fixed wing guy this always seems odd as fixed wing motors tend to have a few degrees of left thrust. Is the whippet plan available anywhere do you know? Dave
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I have recently completed my 'Revolver' autogyro, and the instructions were quite clear on how to locate the CofG. This seemed reasonably straight forward by hanging the model from the rotor spindle and then by the noseleg. I understand that the motor thrustline must not be below the position of this, and in fact all seems OK. My question is regarding how to find the CogG position on a tractor type autogyro rather than a pusher type. I am in the process designing something along the lines of the 'Atom' but slightly larger. Also is there a rule regarding the height of the mast in relation to the fuselage / stabiliser? Any advice would be greatly appreciated. All the best, Dave
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Hi Rich, I've just got my shiny new 3D printer (Artillery X1) and fancy having a go at printing some blades for my Atom and Panther models. Where can I locate the STL files suitable for these models? I've looked at the 'Files' section for the group but don't see them there. The ones that you say interlock sound interesting. Any advice on the printing side would be appreciated, for example which type of material etc. Many thanks Dave
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Advent Prize Draw - 21st Dec
David Oatham replied to David Ashby - Moderator's topic in All Things Model Flying
Please include me in the draw too .... Happy Christmas everyone -
Hi Andy, the only place I found for the dual u/c when I got to your stage of the Panther build was DB SPORT AND SCALE. They were very helpful. Best of luck with your Panther, one day I'll get around to flying mine, but it always seems too windy lol. Dave
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Thanks Phil, I was thinking of leaving the windings in place, I guess the weight saving would not be too significant.
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Hi all, has anyone built the 'Roto- Duo' autogyro that was a free plan in RCME June 2019 edition? If so it would be interesting to know how well it performed. As there was nothing currently on the building board, I thought I'd bash some balsa . It's got 2 rotors that spin in opposite directions, but the only steering control is provided by the rudder, which to be honest looks rather small !! One more thing, does anyone know how I can remove the windings of a couple of old brushless motors. These will be the bearings of the two rotors. I have successfully removed all of the magnets using a hot air gun but i'm struggling with the windings. Cheers for now, Dave
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Hi Stephen, I like your idea. How have you used a drawer runner in your shaper, and how do you ensure that the prepared blank blade remains in the correct position during the sanding process? Cheers, Dave
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This is my contribution to the 'completed' selection of Panthers It was successfully 'maidened' on 16/08/2020 by my friend Kevin, but I feel I need to gain more experience with my Atom and G2 before taking to the sticks myself
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Hi Andy, you will enjoy building your Panther I'm sure. This thread is VERY long as you will have discovered, but from my experience it's worthwhile wading through it. There are (or at least were) a few minor errors on the plan, but that is no criticism of Richards design. Regarding the top spindle, I did as was suggested and placed a 'Wanted' ad on the BMFA Classifieds and picked up one for £10. My Panther is still awaiting its' maiden flight which may take place this Sunday, weather permitting Enjoy the build !!
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Thanks Steve / Rich, Well it wasn't quite as straight forward as I thought replacing my OS40 FS with the 52, it almost fitted!! Some mods to the cowl were required but all good now. I'm almost t of excuses for flying my Panther, but I'm soooo glad I re-read parts of the forum regarding balancing. I had made the classic mistake of carefully balancing the model without the rotor blades fitted. Having re-checked the CG with the rotor fitted, she now is a bit tail heavy, which is annoying as I had to add some lead under the covering below the tail to balance her previously Oh well, out with the scalpel later to remove the deadweight. I've also decided that maybe I need to make more dust to produce a canopy .... Phew, 2 more reasons to delay 'Lift-off'
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