Engines

[brianyemail-nsrca at yahoo.com]

Jerry does your Hacker setup make a funny sound everytime you snap? I noticed this on Jasons setup at the Nats, sounded like something slipping on a shaft. It wasnt the whistle some CA planes make but a vibration of some sort. Other than the battery issues have you experienced reliability problems with the motor and speed controller?
 
 
Has anyone tried the 18" props on the 1.60s yet? Some of the wood props have nice looking tips. Just curious, my gear are too short for that right now. Next plane will be higher. One nice thing about the coming of the electrics, the guys who choose gas will have ample prop clearance in future designs.
 
 

Jerry Budd <jbudd at QNET.COM> wrote:
It's more in the 5700-6000 range, depending on density altitude (load 
on the prop).

>Isnt the Hacker setup turning in the 6-7000 rpm range on that prop?
>
>Jerry Budd wrote:
>
> >More rudder workload for the pilot?
>
>I assume you're referring to adding rudder during pushes/pulls?
>Neither Tony's ePartner nor my E=MC3 require any. If your airplane
>needs rudder during pushes/pulls you either need to retrim it or you
>need a different plane.
>
>>Lower tip speeds, less noise?
>
>The electric (Hacker C50-14XL) isn't dramatically quieter in the air
>due to the gearbox noise it makes. I haven't calculated the tip
>speeds but I would expect them to be way down since one is almost
>never at full power in level flight, and on uplines the prop is
>loaded so the sound never really changes much. I have heard that the
>direct drive Plettenberg (sp?) used by Bernd Beschorner at the
>European Championships a few weeks ago was so quiet, it was "eerie".
>
>>Having to create higher weight, longer, less stable fixed gear?
>
>Same gear mounted lower in the fuselage (no tuned pipe/muffler to get
>in the road). Plenty of ground clearance with the 22-12 prop (over
>2").
>
>>More expensive propellors?
>
>I don't know for sure, I only used one (and it wasn't mine), but I
>think it costs about the same as the 17-12's I use on the Webra.
>
>Thx, Jerry
>--
>___________
>Jerry Budd
>mailto:jbudd at qnet.com
>=====================================
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-- 
___________
Jerry Budd
mailto:jbudd at qnet.com
=====================================
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