Mpizpilot

My Feedback: (45)

Mine is basically complete. I'm way nose heavy right now, which I'm not used too. The only thing I could move back is the ignition battery. Only other issue is the tailwheel retract getting hung up on the doors. Gotta figure that one out.

SWORDSN

My Feedback: (13)

Mine is with a G45 and I had to add 15oz. in the tail.Built another one for a friend with a DLE55 and I placed both batteries on a tray in the fuse behind the wing.Still had to add 6oz.They both fly very well.

aghost

My Feedback: (13)

Mpizpilot - Regarding tailwheel retract/doors - Do you have some centering springs on the tailwheel? If not, that may help.

Brian

Mpizpilot

My Feedback: (45)

I do, but I'll have to check it out again.

mihelone

Good morning.
Anyone has a solution for ground looping ( I fly off tarmac) on landing after the tailwheel touches down?
I am thinking of putting a HH gyro to help on this, I have read that jet guys do it. The phenomenon is so intense that the right retruct strut bends and it is the reason I do not fly this beautiful bird for the last 2 years. I have allready tried toe in etc without success...

FBaity

My Feedback: (2)

On my TF Giant P-51 there is a separate servo for just tail wheel steering, on that servo I reduced travel and increased expo to prevent the ground loop tendency's.

mihelone

Dear Frank,
Thanks for the reply. I also have a seperate tailwheel servo on my P-51 but still cannot avoid ground looping after tailwheel touch down, thats why I am thinking of using a gyro. I've had many bent retract struts from this...

sjhanc

My Feedback: (3)

My new 4 blade prop arrived today. If I get it painted and balanced I hope to try it this weekend. It is a Zinger 22-16. The other blades are 24-16 for the larger motor.

chris923

My Feedback: (53)

Good luck with the zingers....................I have tried 3 Of their 4 blade's. For some reason, the are not very efficient compared o the beila's. IMO

sjhanc

My Feedback: (3)

I know they are not as efficient, that's the reason I work with excess horsepower, you can over come with tuning.

sjhanc

My Feedback: (3)

One more point, the motor I use needs 16 inch pitch and the only other brand which has it is the varioprop, and they did not respond to my requests to purchase one with the pitch I need. So I had to go with the Zinger. I looked at Biela 4 blade props and the only thing in their catalog is a corsair prop which is close but not close enough. The motor I use is under-propped with the 26-15 that I have on hand. I had considered building one myself and now that I have the Zinger to look at I realize that my design would have worked fine but why reinvent the wheel. The Zinger is reasonably priced and the quality is as I expected. When I was trying various large props on my ZDZ 80 RV, I tried several brands and sizes including carbon and for the money, when you have that kind of excess power available the safety factor becomes more important than efficiency. I bent crankshafts on nose overs while taxiing when a wood prop would have broken and saved the crank. After I moved the fuel tank back to the cg the nose overs are less of a problem. Another famous brand threw a blade (26-10) on hand cranking and severely injured 3 fingers on my right hand. I no longer hand crank IC engines. I really enjoy placing my P 51 B on the flight line and starting it by moving the throttle trim. Zinger delivered the prop in one week from the day I ordered it at a very reasonable price.

Johnnie Red

Hello mates

I 've had the opportunity to meet Gregorz Biela at the FAI F4C international in Vlochlavec Poland at the year 2008. It is a nice guy very openhearted. He has very neat techniques in making his Biela props. But while I have used quite a few of them I found out that they work efficient in small and medium rpm. At high rpm they loose power. Even the 2 blade ones, if you compare them with the Menz for instance. The Zinger ones are best value for money since they offer better performance than the biela ones; but they break easier unfortunately.

Johnnie Red

Dera mihelone

Try to use exponential for your rudder together by minimizing the throws on your tailweel servo.
I think that you would save the money from buying that gyro.

sjhanc

My Feedback: (3)

mihelone,
The expo recommended helps (I use 80% on the tail wheel steering). I can move my rudder almost to the limit before the TW steering begins. Another thing I do that helps is to keep the motor idle high so the prop doesn't blank the tail surfaces as it decelerates. This slows the tail drop and resultant gyroscopic precession but needs a longer run out. This is no problem on grass but makes for really long landings on pavement. Once the tail wheel is down cutting power slows it rapidly. I always land with the rudder on high rate for more effective control. I don't always prevent the swing at the end but it is going slow enough that there is no damage.

mark IX

My Feedback: (9)

Sjhanc, I will be eagerly watching for your test flight data with that Zinger 22x16x4 prop you just received. Especially if you are running it with the Rimfire 65 motor. This the same prop I have decided to use on my BT 1/5 Spitfire, if you remember our conversations a couple of weeks ago here on RCU. Please post your flight times, speed, amps, and rpm numbers when you get them. I was also going to use the 24" Zinger as well. Now, if i could just find a good used Rimfire 65...........

BTW, I was just talking to Zinger yesterday and he said he could make a Pro Series shaped blade in the same 22x16 size if I need one. This is more towards the shape of the Spitfire blade than their standard blade as you have. Very reasonable price as well.

Thanx, Mark

sjhanc

My Feedback: (3)

This is what it looks like today. I thought about rounding the tip corners to make it look more scale but the last time I tried that the prop lost performance, so it will fly this way.

mark IX

My Feedback: (9)

Nice job......For your P-51 you wouldn't want rounded tips. Looks good the way it is. BTW you mentioned earlier you were going to rebalance the prop. I thought Zinger balanced their props. Are referring to the fact your painted yours?

Thanx, Mark

sjhanc

My Feedback: (3)

Funny thing happened in the prop balance shop, It is almost perfect.

Johnnie Red

Zinger are very nice wooden props. Light with good airfoils. BVM in my opinion....

mihelone

Dear sjhanc thanks for the reply.
Dear Johnnie I'll contact you anyway....

chris923

My Feedback: (53)

I don't think a Gyro will solve this problem, this need to be fixed mechanically and with radio expo.

Mpizpilot

My Feedback: (45)

I ended up adding about 4oz just behind the opening for the tailwheel.

mark IX

My Feedback: (9)

Sjhanc, have you flown the Zinger 4 blade / Rimfire 65 combo yet? Any data?

Thanx, Mark

sjhanc

My Feedback: (3)

markIX,
I haven't flown it yet, I got a local machinist making me a prop-spinner-adapter setup, he called me this morning about it. If I get it tomorrow I hope to have it ready this weekend. The prop itself is much heavier than a standard 2 blade so I will have to recheck the CG and probably move batteries back.

mark IX

My Feedback: (9)

I would be interested in the details for that prop adapter. I may have to use the same thing.

Thanx, Mark