Quote from: loupgarou on May 25, 2024, 05:08:25 AM

Quote from: zenrat on May 25, 2024, 04:39:19 AMMegadyne would be four engined.

Today I chopped half the mast off.

More difficult/boring will be cutting the rotor blades to shorten them, and later adding the bits to the Megalodyne ones,,,
And what about the tail size? 

Tinydyne had a three bladed rotor,  Maxidyne five.  I haven't decided yet if the blade lengths differed.  Most difficult/boring will be cutting up and rebuilding Airfix's plain and undetailed four blade rotor heads.
Tinydyne may lose the upper portions of the vertical tails.

I always wondered why the 'dynes' rotor pylon was so tall. I expect it was either an aerodynamic reason so the rotor worked better, or to avoid the faint chance of the rotor clouting one of the main engine's prop blades.

My personal theory is that it had to be that tall to prevent the blades from hitting the tail when drooped at start up.  And even then they had to make the tops fold.  Something else Airfix didn't include in the kit (add tail fold detail to the list of possible aftermarket sets).
If you build the Airfix 'dyne OOB the blades hit the vertical tails with even a moderate amount of blade sag added.  Composite blades would sag less so a modern version could have a shorter mast.  However, i'm keeping the height but reducing the length.

It's hard to find a good picture showing just how much clearance there was.  But this gives an idea.



The long tall mast could also have been to provide additional longitudinal stability.

Here's where I started today.

Tinydyne WIP 26-05-24 01 by Fred Maillardet, on Flickr

Then I added a tube to take the rotor axle.

Tinydyne WIP 26-05-24 02 by Fred Maillardet, on Flickr

And then I replaced some of the mast.

Tinydyne WIP 26-05-24 03 by Fred Maillardet, on Flickr

Obviously there is a lot of PSR ahead.  A new door will be created in the tail.

The picture of The Rotodyne above posits a new question.  Did the engine exhaust nozzles rotate like those on a Harrier?  That would have provided extra lift on take off.  I may use a set of Harrier nozzles on this.

 

Quote from: zenrat on May 26, 2024, 02:51:57 AMThe picture of The Rotodyne above posits a new question.  Did the engine exhaust nozzles rotate like those on a Harrier?  That would have provided extra lift on take off.  I may use a set of Harrier nozzles on this.

 No  they didn't, but it sounds like a good idea. I'm not sure if rotating nozzles had even been thought of back then.

Even replacing the entire engine nacelles with sawn-down Harrier fuselages sounds plausible, but I have an idea someone's done that on here already.

But that's some cracking work you've done already, the proportions look much better now. 

Quote from: PR19_Kit on May 26, 2024, 06:06:13 AMEven replacing the entire engine nacelles with sawn-down Harrier fuselages sounds plausible, but I have an idea someone's done that on here already.

Dave (aka Sandiego89) did a variation in his Rotodyne conversion for the Re-Engine it GB.

Quote from: scooter on May 26, 2024, 06:17:32 AMDave (aka Sandiego89) did a variation in his Rotodyne conversion for the Re-Engine it GB.

Exactly what I was thinking of, thanks for the link Scooter, I'd have never found it. 

I did a Do31 for the RN FAA

And my first 'dyne had an Olympus a Pegasus in the base of the mast providing both compressed air to the tip jets and thrust.

Fairey Rotodyne 2.0 - 14 of 20 by Fred Maillardet, on Flickr

An Olympus?

Yeah, should have been just about enough grunt I guess.   

Quote from: zenrat on May 26, 2024, 02:51:57 AM

The picture of The Rotodyne above posits a new question.  Did the engine exhaust nozzles rotate like those on a Harrier?  That would have provided extra lift on take off.  I may use a set of Harrier nozzles on this.

My suggestion is along with the rotating nozzles is to make the wing flaps drop way down to almost vertical with a fin hanging down from the nacelle along side the main gear. You could make the fin part of the gear door. This would help contain the exhaust flow for more lift thrust.

Quote from: PR19_Kit on May 24, 2024, 09:22:43 AMDo they mention the 'broken-in-the-box' rear door hinges?

Has anyone been able to make those four hinges on the rear cargo doors actually work?   Mine were very fiddly and I gave up. 

Quote from: PR19_Kit on May 27, 2024, 07:41:24 AMAn Olympus?

Yeah, should have been just about enough grunt I guess.   

Pegasus, not Olympus.  There is a Hasegawa Harrier fuselage buried in there under a LOT of filler.

Corrected above.

Quote from: sandiego89 on May 27, 2024, 05:56:42 PM

Quote from: PR19_Kit on May 24, 2024, 09:22:43 AMDo they mention the 'broken-in-the-box' rear door hinges?

Has anyone been able to make those four hinges on the rear cargo doors actually work?   Mine were very fiddly and I gave up. 

Haven't tried.  I won't on this one either.  Different plans for the tail.

Quote from: zenrat on May 28, 2024, 05:02:32 AMPegasus, not Olympus.  There is a Hasegawa Harrier fuselage buried in there under a LOT of filler.

Corrected above.

But still LOTS of grunt!