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Jul 05, 2011, 05:15 PM
Right Rudder
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Data

Using PARK ZONE Bf-109 Spinner on my Airfield Bf-109!


For the first couple of pages containing the data of this modification then, go to:

https://www.rcgroups.com/forums/show....php?t=1465222

================================================== =========

Due to over whelming demand, I worked on my Airfield Messerschmitt Bf-109 large EPO Foam Warbird last night and here are the some data.

Try Number #1:

For the efforts in the PARK ZONE Bf-109 Spinner with the Black Gloss and Scale Spinner with the Spiral White Paint, I tried using a regular Push rod wire and bent it to shape to attach at the eye hole from the STOCK Prop Adapter Nut.

Since this Wire comes through the middle of the PARK ZONE Bf-109 Spinner I used a Wheel Collar in an attempt to secure the Spinner towards the Plastic back-plate. This did not work well even though I had all the angles correctly because the Wire was slight smaller in diameter than the Hole through the STOCK Prop Adapter nut. This caused the Spinner to slide away from the Back-Plate during rotation and an ugly vibration would have occurred.

Some Pictures:







Try Number #2:

Okay, I got thinking that some sort of threaded attachment needs to happen at the frontal of this Park Zone Spinner (The Park Zone Bf-109 Prop Adapter will not work for this model as the Airfield's motor is mounted reversed).

I then bent several GWS EPS-350 Reduction Gear shafts that are threaded and finally got one not the snap. You have to be careful not to bend this shaft anywhere the threaded area or it will snap!

Again, my goals to have it threaded through the STOCK Prop Adapter Nut "Eye Hole" and the angles were critical otherwise the Spinner would not go all the way towards the Plastic Back-Plate.

Again some pictures of my attempts








PARK ZONE Bf-109 Plastic Back-Plate and APC Prop Spacer!


PARK ZONE Bf-109 Plastic Back-Plate and generic Aluminum Back-Plate for spacer:



Try Number #3:

No matter what I did for getting the Correct Critical Angles on that GWS Reduction Threaded Shaft it was NO JOY as the Spinner did NOT slide all the way towards the PARK ZONE Bf-109 Plastic Back-Plate as planned.

I then, sat there at almost 3:45am in the morning and thought, wait a minute, how about carefully re-bending the GWS Reduction threaded shaft and have it attached to a Strong Plastic Tie Wrap?

The Tie Warp would be feed through the STOCK round retaining nut "Eye Hole" and looped about to allow for attachment of the GWS Reduction Threaded Shaft!

The need to Critical Angles disappeared and BINGO, the PARK ZONE Bf-109 Spinner Assembly was finally complete on my AIRFIELD Me Bf-109! Of course I found some additional GWS Propeller Converters / Spacers to go into the Hole of the Spinner itself to avoid any lose fitting and thereby avoid vibrations.

Some Pictures:




Additional Pictures showing other items investigated:




3M Brand Double Sticky Tape to avoid rotation during Propeller Tightening!



I used the 3-Blade Master Airscrew 13 X 7 propeller because the the STOCK 3-blade had a deep frontal depression at the Hub base which did not allow for good tight fit based on where the Propeller was on the Prop Adapter. Meaning this depression allowed the propeller to spin even though I had already tightened the Nut!



How well did this Modification Turn OUT, you ask?

Take a look at the VIDEO!!! Select Full Screen Option!


(1 min 46 sec)


FAILURE OF IDEA AND MODIFICATION

NOPE! The Modification was a Failure due to the unbalanced nature of the retaining hardware within the spinner and that GWS Threaded Reduction Shaft spinning at the top RPM range it vibrated something terrible. The model did take off but, had to shut down the motor and landed in an abort manner. No damage, it was not a soft landing but, this model is very tough!
Last edited by PittSpecial; Jul 07, 2011 at 12:02 AM.
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Jul 05, 2011, 11:27 PM
jbc
jbc
WHO's your DADDY!!!
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AHHHHHHHHHHHHH........cable ties, the duct tape of the RC world!
Jul 06, 2011, 11:21 AM
Right Rudder
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Thread OP

Fail


Well, it seems that at very high RPMs the Spinner assembly puts out vibration and lots of noise.

The parts inside such as the Tie Wrap and GWS threaded reduction shaft is of course not balanced so, it will vibrate.

I made an emergency landing without any power and the landing was not perfect but, no damage. It hit with slight wing tip contact and the model tipped over on its spinner.

I am searching for a nice Scale Spinner for this Bf-109 but, it appears to be hard to get a more robust spinner.

Also, the MAS 3-Blade, 13 X 7 X 3 was totally inadequate as far as air speed!

Going back to the STOCK Spinner and Propeller!

Not all modifications are successful....
Jul 07, 2011, 12:03 AM
Right Rudder
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Thread OP
FAILURE OF IDEA AND MODIFICATION

NOPE! The Modification was a Failure due to the unbalanced nature of the retaining hardware within the spinner and that GWS Threaded Reduction Shaft spinning at the top RPM range it vibrated something terrible. The model did take off but, had to shut down the motor and landed in an abort manner. No damage, it was not a soft landing but, this model is very tough!


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