Here is a list of all the postings Tom Wright 2 has made in our forums. Click on a thread name to jump to the thread.
|Thread: Crane Fly Light , Autotogyro Trainer , For experienced pilots trying autogyros for the first time.|
Sounds like a good step forward Richard ,keep up the good work.
Well the most important thing here is your resolution not to give up.
Attempting a new design by scaling up is perhaps a little ambitious until a good few hours of successful auto gyro flying experience is gained . IMHO the AJ is an easy to fly model so at this stage any difficulty encountered should be revisited and considered carefully.
As I have said many times before early days flights are often terminated by disorientation flying to fast , and not having a full appreciation of the trim factors that result in a model that can be managed by a rotary newbie.
To comment on your scale up would require some data on blades,shims, plate, AUW, and power but if its any help I do have a scaled up CF with a mast height of 14" measured from the fus bottom to the pitch pivot point .
If you live within practical driving distance from North Nottinghamshire I would be happy to help[ get you flying with any auto gyro, I also have several CF based trainers that you could have a go with.
|Thread: the first tiger cub microlight|
Thanks for the comments on my model.
As for recovering your TG had you considered a ready sewn Dacron bag for the wings? As always alternative covering methods and materials can go against weight and cost considerations but I have always thought it would be good to come up with a capping solution that held the fabric off the foam.
I recon it would be well worth paying Andy a visit as from what I have seen on here he has made a great job and come up with some interesting mods.
Is this your Tiger Cub? **LINK**
BTW The Micro Bipe was IMHO a deceptively tough little aircraft that endured all sorts of abuse .
Many congratulations Andy well built and well flown,incidentally a Tiger Cub flew from Crosland Moor in 1983 nice to see history repeated.
On the subject of blue foam based aircraft my own design 17 ft span model recently flew for the first time here is the link to the video
Thanks Joan if the model turns out to be as STOL as your AX3 my experiment will have been worthwhile. We have a well manicured runway surrounded on three sides by large open fields but the runway is very short .
Don't want to bore you with old bloke ramblings Andy but this model is an off the cuff quick build experiment undertaken after finding three sheets of inch foam during a clear out, I don't like to waste useful materials so in a moment of madness I did a rough concept drawing and some simple sums and cut out the out line with a hand saw.
The 17 ft span model weighs near to 20kg so I have put it on LMA and got it cleared for covering,it has a 50cc electric equivalent up front turning a 24 x 12 prop the power train with four 5A five cell lipos returns 4 KW . The wing has four 5ft struts so the main spar is quite modest comprising of 2 inch deep 1/4 hard balsa with inch tri section to get good bond area to the foam ,the bending loads are transmitted via the foam to carefully selected inch by 1/4 hard wood spars bonded to the foam leading edge and to the foam trailing edge before the trailing edge is added.
Possibly a daft way of doing things but it just evolved that way and did not break when loaded to + 4 G. Roll is rudder only which keeps things simple for a floaty none aerobatic machine and is a follow on after building rudder /elevator a 10ft blue foam model four years ago which can be seen here .
Current state of play with my current blue foam based project .
Andy thanks for the link to the Pup project, very interesting, I was under the mistaken impression that Bert Rutan and me were the only constructors using blue foam in the early 80s having said that my first full size project the Microbiplane ( photo at the page top) used white foam of a lower density than blue resulting in an empty weight of around 150 lbs and yet the machine was surprisingly robust . I still have a video tape of the Microbiplane performing loops ( very naughty) this was very unusual for the era but the diminutive machine survived transportation to air shows and a nasty prang when a pilot lost power on finals and encountered a deep ditch at touch down resulting in a substantial impact followed by an inverted tail first slide to a stop the damage was minimal and the pilot walked away without a scratch, perhaps this is testimony to the shock absorbing properties of foam structures?
Your moment arm mods emulate conventional structures but I guess the materials used result in better strength to weight and an overall improvement, nice work . My large foam based models all use lightweight caps to eliminate covering contact with the foam this prevents indentations in the foam caused by rough handling and hanger rash it would be interesting to develop a similar approach for a full size design to maintain the excellent covering finish that you have achieved .
Thanks for the info Andy, having now had a quick look at the CAA Q&A SSDR page it re kindles thoughts of new designs to take advantage of modern power units or even,dare I say, electric power for local flights. Your airframe up dates all sound good to me . As a matter of interest is the covering as originally supplied with the kit ? I ask as this was specially produced with a thicker glue layer.
Thanks for your post and interest.
I have used PU throughout my current 17 ft blue foam based model build and would agree it seems to be a better adhesive for this type of application. I think it creates a material friendly bond layer between the aluminium and foam and may even be more resistant to torsional and bending load fractures. Although it could well be better than epoxy it represents a deviation from the original so if you are building under the LAA would Francis D need to give thumbs up? I am way out of touch so don't know what the current procedures are.
I see you have the low wind screen and what looks to be Jims rudder mod,although the all moving control surfaces keep things simple and light I have always thought that a slightly off set fin may have helped with the typical tail dragger yaw to the left on lift off ,but the increased rudder area and a current tail dragger experience should see things going to plan.
Thanks for the photos that looks like a beautifully finished aircraft , just love the cockpit detail and the new wing cores produced from your cnc cutter. Our factory foam cutter designed by the late Russ Light was an analogue affair but did produce hundreds of cores back in the day.
|Thread: The Atom Special|
The advice from Steve is IMHO good .First time Auto gyro constructors should have faith in the design as detailed on plan and keep in mind that such designs have been born from hundreds of hours of experience . Rotor dynamics are very different from fixed wing and generally not well understood so for most so changing the design takes the constructor into unknown territory before sufficient pilot experience is gained.
When the model is set up as advised and the correct pilot technique is understood and implemented then these models can be flown with relatively great ease once the issue of disorientation has been mastered.
Regards to all
|Thread: the first tiger cub microlight|
The prop shown in your photo above may have originated from the pre pro production Tiger Cub G- MBUE which now resides at Newark Air Museum I cannot be certain as many props were produced as part of on going attempts to find the best match for the 440, until recently this prop had been stored in my loft for the last 30 odd years.
As a matter of unrelated interest I am currently designing and building a large model based on blue foam with balsa and spruce sub structures to enable covering clearance to the foam,the model has a 32 sq ft wing area powered by a 50cc equivalent electric motor .
The photo shows the very early stages of construction.
|Thread: The Atom Special|
I f your control throws are set as recommended , could your description of unstable flight refer to an apparent over sensitive roll response? If so a lower shim thickness will result in more lift which in turn can increase the following rate to the point were roll response is hard to manage. Reducing control throws further and or adding expo will probably not help but adding tip weights will so the question is .....do the blades have tip weights fitted?
Increasing the shims to 0.8mm may also make things feel better ,but if spin up is good it may be preferable to maintain high lift and add tip weights if not already fitted. Should you already have tip weights then a more detailed account of the the flight characteristics would help.
Your observations are quite correct ..
Although my model is inspired by the Atom and is also scaled up I consider it to be a new design . As with all my new designs I approach things in progressive way that often involves proving the model uncovered and in the most basic form possible . One of the flight characteristics I insist on is the ability to achieve easy turns using roll only, at this stage I also insist on a smooth turn without any dig in, if these points are addressed along with others then ground steering and rudder will be added .
The initial flight trials have been very successful so this will be anther model joining the fleet the all moving tail and simple roll head are proving to be robust and give good results against the design aims.
|Thread: Winter seems to have arrived, who's been flying?|
This winters weather patterns have been unusually strange , gales, snow, and rain punctuated by many flyable short periods which have allowed a couple of sessions at the field most weeks over the past three months.
Most of my winter flying has been with auto gyros as these models are STOL and tolerate wind conditions that would be demanding for fixed wing sport types.
Flying from frozen snow was particularly enjoyable but as we look towards spring the thought of higher temperatures and checking out some 1/4 scale models helps keep the enthusiasm going.
|Thread: The Atom Special|
My Atom inspired model, roll only head ,all moving tail, filleted single boom, 46" rotor.
Have now flown several times without covering and as Chas found with his XL version very easy to fly ,will now sort our some faring behind the mast bulkhead and covering.
|Thread: What's the largest Model You've Been Able To Get Into Your Smallest Car?|
Edited By Tom Wright 2 on 18/02/2015 11:33:15
Want the latest issue of RCM&E? Use our magazine locator link to find your nearest stockist!