Cox 020 Pee Wee average motor run time?

rdw777 wrote:Mike, Mine run 90-120 sec depending on needle setting (24% nitro fuel, Cox 4.5 x 2 prop)…

What is the average flight time (gliding) for the replica 020 planes?

Thanks.
sosam117

Cox yellow 4.5x4 extended Jordan's flight time due to reduced rpm.



Feb 8, 2018
Jordan Kearney / New Zealand
Pee Wee .020 Est. 5.5cc external tank run.
20/20/60 fuel
Nano style- all balsa with ply firewall


 

This is what I have completed and flown in the last 2 months:

I have completed the Dixielander with R/C gear installed. (modified BMJR Dixielander kit)



Electric equipment is:
Innov8tive designs outrunner motor 2800kv (Cobra C-2203/28 Brushless Motor, Kv=2800, E36-F1S as used for electric free flight).
I am using a 4x4 GWS prop.

The event we are deciding on the rules, (so far) does not allow for a folding prop (SAM Replica Event) like having a Pee Wee engine on the front but replaced by an electric motor.
2 cell lipo pack --- size and capacity not specified as the fuse on each plane will be different (whatever fits but has to be 2 cell pack)
Span has to be 36 inches (Replica type rules)
Currently motor run time is 2 minutes with a total flight time of 10 minutes.

Anyway:
The Dixielander equipment:
Servos are Hitec HS-35HD Ultra Nano servos which just fit inside the fuse.
Castle Creations 15amp controller and a 2 cell 400 lipo pack.
Covering is from FAI -- clear mylar ¼ mil covering on the tail area and 1 mil on the wing.
Lightly sprayed black paint on the bottom of the wing for visibility.
Long tail moment, so I had to find a 2-cell pack that would balance the plane at the correct location.

Increased the wing incidence by ½ a degree (about 3/32 wedge on the bottom of the pylon) from what was in the kit.
As for side thrust -- I have 4 degrees (right) and down thrust is 2 degrees.
All up weight, ready to fly is 7.8 oz

It climbs very well on ½ throttle and is out of sight (almost) in 90 seconds.


Gliding time is over 9 minutes without any thermals.

SAM is looking at the Replica event to hopefully spark new (younger) members.
As there were many years ago Replica 020kits out there and the AMA has a E-36 (electric) event as well.

So,
That is the reason why I asked this question.

Thanks for all of the help and inputs.

M. McIntyre

rdw777 wrote: Sounds like an interesting event Mike…. And very nice Dixielander…fantastic glide times!!…. You’ve shared span and weight…. What’s the wing sq. in.?. Must be a very light (and efficient) wing load to glide that well ….

Wing area is 189 sq. inches
Stab area is 78.75 sq. inches

Under camber airfoil looks to be something like an RF-32 airfoil?

The plane balances on the beginning of the 1/2" size trailing edge.
So, it is 1/2" up from the edge of the wings T.E.

Extended the nose of the fuselage 1-3/4" for two reasons.
1.) I knew it needed the nose extended to get it balanced with the extra wood to add the needed wood for control surfaces.
2.) To make room to move the servos in front of the pylon and not have the weight of the servos adding more weight to the tail.
The servos would have been behind the balance point (trailing edge).

Gave the fuselage just 2 coats of dope. 1st one was to seal the wood and sand off the fuzz when it dried.
Then the 2nd coat for a good water-resistant coat. I fly in the morning with dew on the grass.

rdw777 wrote:Thanks for the details Mike, Sounds like a well thought out and set up plane… With the far rear balance point the stab will carry a good bit of the load too….Guppy’s wing load is a bit more plus a weird airfoil…. The plan has a built up wing included…. Maybe I’ll build it one of these days

I remember the Guppy from ACE, along with all of the other items that ACE had.
Variable chargers which I still have and use as an example of their product line years ago.

Another good company gone.

An interesting note ----- Stefan Graupner has started his own company ------- SG Modelbau
Here is his website:
https://sg-modellbau.de/en

GallopingGhostler wrote:I remembered the comments by Tom Runge of Ace R/C. Unfortunately, they could not purchase electronic parts, particularly the special components required in the transmitter section and RF receiver section cheap enough to compete with then Japanese imports, Futaba, etc. Thus, they could not continue in production, ditto with Phil Kraft, Cannon, Heathkit, etc. Protectionism by import tarrifs unfortunately were not used by the US federal government to level the playing field.

The plane kits and foam wings was an outgrowth of their earlier radio sales. The foam wings have a semi-symmetrical airfoil similar to the Goldberg planes such as the Falcons, Skylarks and Cessna Skylanes. It is said to have better wind penetration than the standard flat bottom Modified Clark-Y airfoils.

The 35 inch untapered Ace wing, with modification to the cabin wing saddle to fit its bottom profile would make a good wing for the Sterling Minnie Mambo.

My dad and I had the ACE High powered glider with a EK Logictrol 3 channel brick ( on 27mhz --- CB channel)
I still have the EK Logictrol 3 channel brick (and it still works but won't use it as radio interference is now really bad on it.)




And the later "newer" EK Ranger brick radio on 72mhz ( which still works also)

GallopingGhostler wrote:I hear you, @sosam117 , I bought a Hobby King transmitter conversion kit with TX module and receiver to change out the RF section of older digital radios to modern 2.4 GHz, just haven't installed it yet. A solution like that would permit reuse of the Logictrol transmitter, but of course would obsolete the receiver-servo brick. However, it would be eye catching for someone to see you putting it to use.

Out here, we haven't seen the CB interference, but Clovis is a little off the beaten trucker path. If I lived near a major interstate highway, then could be a problem.

CB interference is not that much of a problem as it once was.
With cell phones and other, better technology, CB radio is not really used that much anymore.
In and around the Chicago area, Remote controlled (R/C) cranes have taken over the 27mhz and 72 MHz frequencies.

At my/our flying site, on 72 MHz, brown/white --- red/white --- blue/white and green/white are not usable.
And on the "old" R/C frequencies there are/were a total of seven channels that "were" allocated for R/C aircraft, but somehow remote cranes are seemingly "close" to those frequencies.
I had to change my frequency from what I had (blue/white -- 72.160) and changed to violet/white (72.320mhz).
My EK ranger "brick" is on that blue/white frequency.

So, when I changed to violet/white (72.320) I also went to using Airtronics radio, which later on (bought new set on 2.4 FHSS) I updated to the new 2.4mhz. band and never looked back.

I looked into converting the old radio gear (when I saw them at the Toledo Expo years ago) to update them, but with the cost of the upgrade (updating) over just purchasing a new transmitter, I thought it was a better option just to get the new transmitter which then would have a few more channels for the same cost.