Cox .01 /.02 /.05 /.09 /.15 Speed Planes

Thank you András

This one will be easy to compare to the NANO III it is 11% smaller. The servos
metal gear 5.8g vs 9g servos in the last build. Beyond that the other was 8oz
less fuel the goal is to loose 1oz and hit 7oz less fuel.

I know I don’t comment much, but I do want to say I admire you for doing new and inventive things with these engines. You squeeze every last bit of power out of them and it’s impressive.

Thank you Eric much appreciated,  

I get the fun out of pushing for performance. All came from the late 80's and 90's when I was wishing the RC gear would
get small enough to really do justice for the small Cox engine line. In the mid 90's the Futaba small servos made it happen
with the TD .09 extreme speed over 100 was possible and made good sport flying servos for the TD .049.

Comparison with the NANO that hit 139 mph prop pitch speed /  some size reduction with the honed down version.
Smaller new metal gear servos make for room and weight savings will add up across the board. Imagine what will be
possible 10 yrs from now most likely solid state servos that do not use gears or motors yet put out more torque and
weigh / less than the counter parts today.

Let's push it some more. Design a hot hell rider plane with a micro camera focused on a gerbil in a clear plastic pod mounted to plane.

Ticomareado that's not a direction I would want to go lol!

It took almost 2 hours messing around with different ways to secure the stinger, I wanted something that
was not bulky or heavy. Normally I make a aluminum bracket and polish it up but the drag is increased
for a fancy holder so this is was the most simple way to go and is field removable. The piano wire press fits
into a ply plate. The height is adjustable and can be removed in a flash to take the wing off when out flying.
Very secure no chance of loosing the pipe flying fast nor breaking the seal at the manifold. 128g as shown.

Some progress the wing servos have a home now, it dawned on me I can have flaps a big plus when forced
to land down wind. SIG airfoil core used has 6mm to 5.5mm depth to work with servo is 8.65mm. Span came
out to 25" and 78 sq/in. area should be blistering fast. 5.8oz thus far as shown nothing left but low weight
items to do yet should be close to the target weight of 7oz.

Hey Brad I see you do not waste your time in the New Year holiday season..big advance on this new plane.

I was also wondering whether to use the Dubro tail mixer for flaperon function of the ailerons in my larger planes but so far have not used them..what is your design for flaps? Unless you have separate channels for the 2 aileron servos the only solution is the tail-mixer for flaperons?
https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.co.uk%2Fulk%2Fitm%2F322336587562

Thank you András
I do not have the room to use that but yes could be done with that hardware. The Skorch had a servo for flaps with the TD .049.
I had separate flaps though so no issues or need to mechanically gang them with the aileron servo. For this project of course
the computer radio will mix in flaps I will have high and low rates for that function via a toggle switch. You could mix in flaps
just by using two servos for future projects. With existing if there is room to have two servos side by side then it would be
a simple fix to mix in flaps with a modern radio. I bought this Y harness to use with this plan project unique single plug holds
two servo plugs, nice clean setup.

Thanks Brad for the explanations. I also use the Y harness if have 2 separate servos for the ailerons like in my TeeDeeVooDoo, Denight 50 and SIG Wonder planes.

Some progress cut out the tail feathers out have not sanded in the airfoils yet.
Propped them up in place to see what the over all look of the design based on the drawing I did.
I did not deviate from the original drawing for this plane project, it's always interesting to see
a one dimensional drawing pop out into the physical world as shown below. Battery showed up
in the mail not bad at just 13g.



Ply footing to help keep the vertical stab in place at speed.

Tell me more about that battery. What kind of charging equipment is needed? What does its discharge curve look like? Can it be used with older conventional digital proportional flight packs that would normally use a 4.8 to 6.0 volt battery pack?

Brad the way it looks it is going to be a helluva fast plane!!

Heheh yes András  all engine up front!!
When they look like that typically you can expect power to weight ratio good to go!
I expect this will be the new fastest RC 3ch Cox .05 plane on the planet.
Has to beat my NANO III which is no slouch at 141 mph pitch speed thus far with the TD.
Doppler 136 mph as it passed 5 ft. in front of the video camera.

Hi Tico you need to read up on how to charge and care for LiFe batteries, the up swing is
after you charge them they hold their voltage for a long time very little loss. So you can
charge a week ahead and still have nearly full capacity after a week in fact after 4 weeks
a 100% charge LiFe pack will still have 96% capacity. Coreless motors can handle the volts.
Older bushed motors may not. The RX can least the one I am using is ok up to 9v. Today
may folks use 2 cell LiFe batteries for the RX and servos. Lipo cells start off at 3.7v nominal.
After they are fully charged they can hold up to 4.2v this is a bit much on servos in a 2S
configuration you can run the risk of reducing the life span of the servo. Generally there
will be warning (not to exceed volts) on some of the micro servos you have be aware of
the specs know what motor is in the servo. When in doubt use a 5v voltage regulator with
LiFe or LiPo 2S packs.

NiMh cells are 1.2v nominal when fully charge the cell can peak with a digital charger to 1.6v
4 cell pack will settle down to about 5.8v after charging they loose voltage and capacity hourly.
You can charge one day and have a 15% loss the next, I use them with my TD .010
and .020 projects and always peak the pack before I head out to the flying field as capacity
it set for 4 to 5 flights tops any more than that is dead weight when it comes to performance planes.
Much information throughout this thread all things fast.

Painting a picture here will at some point bench test this setup to see what it can do.
Pipe length has been set at 7" ideal length for max rpm unknown.
Pipe is 8mm OD / 7mm ID should have a very steady idle.
Clears the wing so only the tail feathers will need cleaning off between flights.
Good goo control and noise suppression should sound great.

FYI on a nice 5g servo mount two per pack. Will use this for the throttle.

Brad,

I spend most of my plane building time in mounting the servos on proper stands that I typically make from scrap plywood with more, but rather, less success.

Where did you find those aluminum mounts? The few hobby shops left standing in my hometown always stare at me with blue eyes when asked about servo mounts for micro servos.

Thanks, András.

These work very well you will appreciate how fast you can secure them to the plane, I have bought 10 of them thus far.  

https://www.ebay.com/itm/Qty-2-Aluminum-Servo-Mount-for-5-Gram-5g-Micro-Servos/162603837782?hash=item25dbf1a956:g:GU8AAOSwNSxVNWRZ:rk:210



https://www.ebay.com/itm/Qty-2-Aluminum-Servo-Mount-for-9-Gram-9g-Micro-Servos/160427436842?hash=item255a386b2a:g:dmEAAOxyW1NREwTL:rk:11&frcectupt=true



Dry fit not sure if I will use the 9g servo yet just seeing whats possible.


Can confirm the mounts work on these:


This servo is metal gear with a top bearing almost the same size as the 3.7g which puts out 10oz of torque
with a 6.6v LiFe charged battery it would be lower in weight if not for the bearing and metal gears. The benefit
is it's small size and the torque it puts out with a 6.6v LiFe battery fully charged you start out with 26oz torque
this is why I have them for the wing ailerons. I am going to take a chance and use it for the elevator as well to
save weight as the 9g servo wires are heavy and longer than needed for a plane this size. Requires washers to
hold down the servo do to the slightly small size. Highly recommend 2-56 hex / socket head bolts over the stock screws.



Here is the size / weight /output comparison.




Elevator servo is in place now with the foam isolation tape the wood surface was sealed with wood sealing latex paint by doing
so the sticky tape has 3x better sticking grip and should last. The smooth aluminum surface of the mount seems to equally
have superior grip to that surface. Engine vibrations should be greatly reduced the servo floats 1mm off the floor of the fuselage.
I would not recommend ever attaching to bare wood without using some additional glue, it simply won't last heat of the summer
could loosen it off the surface. Here it gets over 100F in hindsite I redid mine and added glue to both sides.

Much, much, much, dedication and your beautiful way of sharing experiences, make of my valuation towards you dear friend.
I keep your advances in mind!
Happy year, for you, friend !!!

Thank you Mauricio I am happy you have enjoyed seeing what I have been up too.
Yessss Happy New Year!!!!!

Here is the finished work mounting the servos came out nice and clean:

I had those DSM44 servos in one of my planes and they work well and last long. Congrats Brad for the fast advance and nice build.

Thank you András, I have used those servos on the TD .020 version for the ailerons with no issues.

Going with the black carbon scheme for the fuselage, not sure on the rest yet will do the tail feathers next
and the wing last. Need to do some work yet on the wing ailerons need to be cut out and need to sort out
how I will finish off covering the servos up.

The more I eyeball the dimensions and geometry of Nut's hell burners, it occurs to me that a scale ME-109E hell burner might be feasible.

Patience is key on this effort not the covering per say it's a given more so the alignment of the horizontal and vertical stab.
At the speed this one will go I need solid ridged strength helped by the two stepped ply footings integrating the 3 components.
Another benefit it aided in quickly aligning the stabs at that crucial moment when using thick CA provided enough
working time to adjust all axis to perfection. I don't like using epoxy as it makes repairs harder to fix.

Nice job on cramming those servos in such a small space , and i do like that carbon covering You really put some smoke on building this model ! Ordered some of those mounts i like the way there easy to work with and small enough for a couple models that need some new mounts and servos , If i may ask what RX do you use with your DX6I i need to get one or two . Thanks Brad .