Who is Building

I like Rivets, is different

jmcalata wrote:I like Rivets, is different

Me too, but elevator control will be awkward with the high tailplane, or
horizontal stab if you prefer. Nice model though, should go nicely with
a TD 0.020 John

I´ll make something like this.

Yes but you have to finish the Dakota first, we want to know how it
flies hands off sticks with 5deg left thrust on engine.
Sure it will be fine with a bit of right rudder trim to hold nose up.
Was designed for flying tight left turns. I wonder how tight. John

Left thrust is only for littles circles free flight, I´ll make line thrust 2 degrees down and right for rc flight.

jmcalata wrote:Left thrust is only for littles circles free flight, I´ll make line thrust 2 degrees down and right for rc flight.

There seems to be a lot of confusion here about why you need thrust line deflections in a model.

In freeflight, the amount of thrust deflection (side or down) will depend on the engine/prop combination, and wing incidence, in no deflection is used the result is a powerful left turn caused by the torque reaction from a prop spinning anti-clockwise, right side thrust counteracts this, if the engine was running clockwise (with a "Left-handed" prop) you would need left thrust.
With a conventionally rotating engine 2 or so degrees right thrust gives you a straight flightline under power.
No downthrust on a powerful engine will result in a power stall, or, in extreme cases, consecutive loops!
This does not necessarily apply to radio control, since trim can be put in to counteract these effects.(Although this is not a good idea)
In free flight, a combination of left thrust and propeller torque will result in a spiral dive into the ground.
In free flight, the fact is that a left turn under power is to be avoided at all costs!

This is based on aerodynamic theory and many years of freeflight experience.

Good explanation !!!

Agree with most of what you say except ' Left turn under power is to be avoided
at all costs' I trim all my free flight models, and there have been many over the years
to fly left power and right glide. Adjusting right thrust on the engine of course to
make a controlled circle left of the size I want.
I wonder about the Dakota though, if you study the plan you will see it is powered by
an OK Cub if I remember, Not a left turning engine, because it could not.
A successful kit design for twenty odd years and quite clearly with 5deg left
thrust. Did it spiral into the ground every flight? If you read write up on the plan
you will see that considerable thought was given to trimming and aerodynamics.
We will never know I suppose till someone flies it free flight.
John

proctor wrote:Agree with most of what you say except ' Left turn under power is to be avoided
at all costs' I trim all my free flight models, and there have been many over the years
to fly left power and right glide. Adjusting right thrust on the engine of course to
make a controlled circle left of the size I want.
I wonder about the Dakota though, if you study the plan you will see it is powered by
an OK Cub if I remember, Not a left turning engine, because it could not.
A successful kit design for twenty odd years and quite clearly with 5deg left
thrust. Did it spiral into the ground every flight? If you read write up on the plan
you will see that considerable thought was given to trimming and aerodynamics.
We will never know I suppose till someone flies it free flight.
John

Agreed, with enough experience you CAN trim for a controlled left turn under power, it is the exact opposite to normal practice, which is right under power, left on the glide, but as the saying goes, there is an exception to every rule, and as long as it works for you, go with it! My explanation was intended for a probably inexperienced flyer, and IMHO it's best to play it safe!

It's a Minnie Mambo. Should be done in a few more days. Has a steerable tailwheel and a Surestart .049 with one of Bernie's intake throttles. 2 1/8" Trexler Balloon Wheels for handling ridgetop and gravel bar landings.

Hi Tee Bee, your Minnie Manbo is beautiful.

Dakota RC, is also powered by Surestar RC control air !



Here, surestar RC test run.

Great stuff, just what I hoped this thread would become, nice models guys.
Can't believe how well the Surestart throttles, what size prop?
Latest photo of the mystery ship, adapted for Schlosser 0.25.
https://i.servimg.com/u/f46/17/26/04/06/twin_l13.jpg

Surestar prop may be 7x3,5" grey COX or Top Flyte Wood 7x4" max.

my friend Ziimzy is soon going to start building his first own design plane!

jmcalata wrote:Hi Tee Bee, your Minnie Manbo is beautiful.

Dakota RC, is also powered by Surestar RC control air !



Here, surestar RC test run.

Very nice model, and I love those wheels! who makes those?

There are Trexlers wheels.



http://www.trexlerballoonwheel.com/

Yep, I got a few of the smaller sizes if anyone is interested.

Hi Indra,
Do they go as small as 1 1/4" - 1 3/8" as they would be just the ticket
on the model I'm building.
The only Trexlars I have owned were larger on a Lazy Bee but the rubber
perished when it was stored in the attic.
BTW have PM'd you re Conquest.
John

nitroairplane wrote:Yep, I got a few of the smaller sizes if anyone is interested.

how much would the smallest be like if you had between 1'' and 1.5''. im building a guillows 24'' piper super cub 95 kit #303

Simplex 45 - 1/2a Texaco - 3/4 size version of a pre-war A class free-flight model. Built from a BMJR kit, for 2 channel radio. Using one of Bernie's ICON radios and a TD .051 for power. Just about ready to cover. First plane I've built in like...??? 45+ years???

Laser cut wood is the bomb-diggity.





Based on a few comments I found on-line, I made a few mods (Hey! It's my kit!). Basswood spar and extended the nose about an inch. I also used diagonal bracing on the aft fuselage sides instead of just vertical uprights, because, well, I like diagonal bracing.

Basically hoping it turns out like a powered glider. 30 or 45 second engine run to get some altitude, then glide it around and keep it in my general area with the radio.

Lovely!

ahrma ---

Whatever you decide to use for covering, it needs to be transparent since it would be a shame to cover up all that woodwork. A plane in the air with the sun shining through is pure classical flight. For an old timer look alike, seeing the structure is a must.

Going to be white/plain silkspan for wing and fuselage (I think I still remember how to do that). Then, red tissue for the tail and trim along the leading edge and some kind of 30's swoosh on the fuse front and top edge.