vh2q

My Feedback: (5)

So the prop of the Pee Wee fits the intake duct, for the plane you are holding in your hand? Then I suppose you have a fuel hose and an extended needle on the off side?

jonastecknare

Hi again guys! When i started the PeeWees i had a wooden dowel (6mm) with a short piece of fueltubing at one end. When the engine is running i simply pull it of the nedle. (I made a drawing to explain) Trying to put a fan on a peewee is a waste of time and effort!
The TeeDee on the other hand. In the 80:s a guy (Shane Harding) made a small F16 with anTeeDee and a homemade fan. The fan was made of ply and fibreboard(whatever that is) There was an article in RCM&E.
Jonas

jonastecknare

Why do the pics get so large? How do i avoid it. Anyone knows?
Jonas

vh2q

My Feedback: (5)

We like the large pictures Jonas. Now we can see that's not a Pee Wee engine in that Saab. It is something bigger. Are the plans you posted above for the smaller version of this plane? I want to build one without undercarriage but I think I will put a ducted fan electric in it, to avoid all the problems with fuel inside the fuselage.

jonastecknare

A lot simpler, thats for sure! Getting these engines to stay running during a hefty throw is a strain on anyone!
But then im a bit (alot!) pigheaded. Anyway i dont like electrics but if you want to avoid hassle its the way to go!
Be carful with the chanels to and from the fan. Small mistakes cost a lot in thrust.
Jonas

jonastecknare

Some films of some of my small monsters!
Jonas
http://www.youtube.com/watch?v=yRETHTgqWfU
http://www.youtube.com/watch?v=hQZVmmOkSL4

vh2q

My Feedback: (5)

That Tunnan lauch looks tricky/hairy, is that because it's underpowered, or too much pitch on the prop, or ?. It looks like rolling the dice to me esp on the first few flights when the trim might not be perfect. The bipe was cute.

jonastecknare

Yeah! The Tunnan had a cutdown 7x6 prop or maybe 7x5. I think cutdown to 5 inches so your right it needed a bit of time to get up to speed.
That version was a bit overweight as well but once on the step it was very fast and groovy. Landings tended to be a bit.... well hard!
Im slowly working on an updated mould for the fuselage. Im not done yet! The bipe is fun to, I just might do proper drawings and post them here. We shall see what may happen.
Jonas

DeviousDave

A 5-5 for an MP Jet glow motor us a lot too much prop-you might try something with less load to get it up in the power-she sounded a little labored in the vid. The MP Jet .06 is another one of those wonderful iron curtain motors that runs decent on standard 1/2A props but comes into it's own with smaller props. If that was the diesel version of the MP Jet, it would be perfect on a 5-5.

jonastecknare

It probably wasnt 5 inches but maybe 4,5! I dont really remember. Anyway i tried a lot of different props and this was what worked best.
You are right that the engine laboured hard at takeoff and climb. but when i lowered the nose none of that mattered!
The main issue with the machine on the film is weight! If i remember correctly it was 600g. I belive it is entirely possible to shave of 200g of that! I have an halffinished version that promise something like that! the MPjet is really an super engine. Really good one!
Jonas

nitroairplane

MrGoodwreck

OK, a little ducted fan jet is very cool...

You guys are really starting to get me interested in these little engines again.

Jaspur_x

My Feedback: (1)

I always wanted to build a ducted fan jet using a cox 010 or teedee 020 at the biggest. Years ago I got my boys a sonic blast freeflight ducted fan jetfor $20 or $30. it was ok asfar asfreeflights go. I wanted to convert that fan to fitmy teedee 020 or even better the 010. I have`nt gotstarted on that yet.and of course I wanted to make it r/c instead of freeflight

coriolan

Saw pictures a few years ago in MAN I think of a small ducted fan (TD .020)with a home made fan, and it was r/c. Sometime I wonder if some of the small fan impellers we have now for electric would be strong enough for .020 or .010. I have one of the old Axiflow .049 (about 3") ducted fan but never actually tried it, the fan is a lot stronger than equivalent electric but there was problems with balancing the spinner. Electric fans have less pitch and requires very high rpm to achieve enough thrust but one of the smaller fans 30<50mm GWS might be the proper load for a TD .010

MJD

My Feedback: (1)

For reference you can see the power output in watts vs rpm of the small Cox engines on Dr. Hepperle's site -

http://www.mh-aerotools.de/airfoils/cox_frameset.htm

look under "Performance".

coriolan

The TD .020 is not bad in rpm and power but I doubt the TD .010 would move enough air to be practical. Electric 40&50mm DF with 12mm brushless can provide decent performances
Test from Medusa with their 12mm motor and GWS 50mm DF
http://www.medusaproducts.com/motors...edfresults.htm
The GWS 40mm might be better matched to TD .010

12mm x 30mm Brushless Motor
EDF Test Results Setup:
Tests performed using an Electric Ducted Fan - EDF 50 with no inlet shaper driven by a Medusa Research MR-012-030-4000 motor.
Results:
EDF 50 Three Blade Fan (2030-3)
Motor Voltage Current Power RPM Thrust
7.2 Volts 2.16 Amps 15.5 Watts 27,397 2.19 oz
8.4 Volts 2.69 Amps 22.6 Watts 31,513 2.75 oz
9.6 Volts 3.37 Amps 32.3 Watts 35,461 3.67 oz
11.1 Volts 4.27 Amps 47.4 Watts 39,841 4.55 oz
EDF 50 Five Blade Fan
Motor Voltage Current Power RPM Thrust
7.2 Volts 2.76 Amps 19.9 Watts 26,132 2.58 oz
8.4 Volts 3.59 Amps 30.1 Watts 30,000 3.39 oz
9.6 Volts 4.31 Amps 41.4 Watts 33,370 4.20 oz
11.1 Volts* 5.28 Amps 58.6 Watts 37,500 5.22 oz

Jaspur_x

My Feedback: (1)

I would imagine te toughest problem would be getting the correct size/pitch/ number of blades on the fan unit to allow the engine to run at proper peak rpm, and achieve good thrust ( if even posible)
And getting the prop nut hole in the cone dead centered of course.
I still have the remnants of that old sonic blast freeflight edf jet stashed away somewhere. I trhink an dff would sound way better with a teedee in it than electric. Maybe the teedee 049 would be a better candidate, but I`m not into aircraft that large anymore.

coriolan

The old Kress and Axiflow were claiming almost 16 Oz with a good TD .049/.051, was probably optimistic since nearly all the 1/2A DF planes of the time required bungee lauch!

Jaspur_x

My Feedback: (1)

I was hoping to see some video , but oh well.

I will stray slightly from the current topic, more toward the original topic of this thread; does anyone know of a delta wimg design for the tedee010?

vh2q

My Feedback: (5)

Here's a micro delta wing that is designed for electric but could probably be converted ...[link=http://www.superflyrc.com/MiniFly_p_84.html]minifly[/link]

If you ever get it done, let us know, I really like bellylanders and I enjoy flying wings .. only problem I see is how to start the motor.

vh2q

My Feedback: (5)

Here's my rubber band conversion in process ... I am going to fly it tomorrow maiden flight! This plane was started by my father-in-law, he never finished it may he RIP. Nobody wanted it, so I put it in a cooler and kept it for 10 years. When I started thinking about 010s and 020s, I remembered the plane. It's awfully delicate but the hay is already 10" high so I am going to maiden it over the fresh green hay and hope that it survives an unplanned or rough landing. The wing struts are vulnerable, as are the wheels.

Jonas, I still want to do one of your small Tunnens with an electric ducted fan, as my first ever "Fighter jet" project. I fly over grass so the belly landing capability really appeals.

Jaspur_x

My Feedback: (1)

vh2q,
  Thanks for the link, I will have to check into that one closely, has potential. And thats a nice framed up plane, aim a camera at it for a flight or twop and lets see how she flies..............

My son saw this thread about a week ago, so guess what dad gets to do.................. yes, we started on a fan for the micro sized jets. The first fan we grabbed looked just right for the 020, but I think it will take an 049 to turn this one. The 020`s just never rev up with the fan on, no matter how I go with the needle. I ran out 3 tanks with the peewee trying to get it to rev up, then switched to the teedee and still no dice. So I have to pick a smaller fan for the 020 and the 010 engines, will try a 049 for this fan some other time. Our goal is a peewee 020 or teedee 010 ducted fan jet.

vh2q

My Feedback: (5)

I could not get that 020 started, finally realized the carb venturi body had a crack in it that was sucking air. So the maiden will have to wait until I get a new carb body.

Where did you get the 049 fan assy? Has anyone tried to use the fan from one of those electric cooling fans used in electronic equipment, eg computers, projectors?

Jaspur_x

My Feedback: (1)

The venturi bodies are still available, through cox int. or on ebay there are aluminum venturi bodies; but you wil have to come up with an arangement for the starter spring as the aluminum venturi body doesnt have the stake for the spring.

I used a cooling fan for the one I tried, its about 2 1/2 with 11 blades and about 3/4" center where trhe electric motor was, but its too much load for even the teedee020 to rev up, so I will have to try that on an 049 and find a smaller unit for the 020 and the 010.
I like the cooling fan for this project because they are meant to move air at lower rmp`s than an edf will

vh2q

My Feedback: (5)

My rubber band conversion is misbehaving. From a hand thrown start, it flies off about 20 yards reasonably stable, looks like it wants to respond to controls, but as it picks up speed it just goes beserk. Straight up, hard turn, nose into grass, all this happens rather fast. It's as if my RX is having a conniption. But I think this 020 TD is too much motor. I underestimated the viciousness of this little Cox. I will double check the radio connection and then maybe put an 010 on this plane.