REFLECTOR: Fw: M/T Electric Prop

Mon Mar 24 20:39:02 CDT 2008

Jim
  Ronnie has good idea about bumping the static RPM up a little, but  be 
careful. I have recently had a brush block failure to my MT electric prop, on  
take off. Could have been a processor, a wire, or a pitch adjustment motor  
failure. In any case the prop gets stuck in one position of pitch. If the RPM's  
are to high on "your initial roll" when you get to take off speed you  might 
overspeed the engine. A very delicate balance of throttle and speed  to overcome 
that One!!!    For what it's worth.

        Ken

In a message dated 3/24/2008 7:52:11 P.M. Eastern Daylight Time,  
romott at mi-connection.com writes:

Jim,

When I read your note about the low rpms at  initial roll, I thought this 
didn't agree with Dean's electric M/T on his IO  360.  Perhaps you can adjust 
your prop to give more like 2700 rpm and 200  hp on your initial roll which 
should much improve your take off  distance.

Ronnie

----- Original Message -----  
From: _Unterreiner_ (mailto:naomi at yadtel.net)   
To: _Ron Brown_ (mailto:romott at mi-connection.com)  
Sent: Monday, March 24, 2008 6:01 PM
Subject: Re: M/T Electric Prop

It actually goes to about 2750. The adjustment nut is at  it's limit so it 
over speeds a bit. My limit rod needs to be changed so it can  be adjusted 
properly, this is why it over speed when I lost the governor. Jim  should be able 
to set it so it will go to 2700 early in the takeoff roll and  then it should 
adjust the blades as you pick up speed and stay at  2700.

----- Original Message ----- 
From:  _Ron Brown_ (mailto:romott at mi-connection.com)  
To: _Dean Unterreiner_ (mailto:naomi at yadtel.net)  
Sent: Monday, March 24, 2008 4:28  PM
Subject: M/T Electric Prop

Dean,

Doesn't your M/T go to 2700 rpms on initial  full power or does yours lag 
like Jim's? 

It would seem that the take off run would be  much shorter if the engine was 
making 2700 rpm at the beginning of the  roll.

Ronnie 

----- Original Message -----  
From: _Jim &  Sharon Beck_ (mailto:jsbeck at charter.net)  
To: _Velocity Aircraft Owners and Builders  list_ (mailto:reflector at tvbf.org) 

Sent: Monday, March 24, 2008 1:12 AM
Subject: Re: REFLECTOR: VG for naca scoop.

Al. 
I break ground at 85 MPH and the Rpm Runs right  up to 2550 when I add full 
throttle and then keeps moving right up to 2700  at about 65 mph. Acceleration 
seems pretty good up to 60 mph and then seems  to slow getting up to 85. I can 
lift it off before 85 but will settle back  in and run a bit longer on the 
wheels. 
thanks 
Jim

----- Original Message ----- 
From:  _Al  Gietzen_ (mailto:ALVentures at cox.net)  
To: _'Velocity  Aircraft Owners and Builders list'_ 
(mailto:reflector at tvbf.org)  
Sent: Thursday, March 20, 2008 7:09  AM
Subject: Re: REFLECTOR: VG for naca  scoop.

Jim;    
Could this be  more an issue of thrust than lift?  At what speed do you ‘
break  ground’?  What is your static rpm? What rpm do you see during takeoff  
roll? 
-----Original  Message-----
From: _reflector-bounces at tvbf.org_ (mailto:reflector-bounces at tvbf.org)   
[mailto:reflector-bounces at tvbf.org] On  Behalf Of Jim & Sharon Beck
Sent: Wednesday, March 19, 2008 9:57  PM
To: Velocity Aircraft  Owners and Builders list
Subject: Re: REFLECTOR: VG for naca  scoop. 

Thanks for all  your good information on the VGs placement and other good 
ideas. I've been  working on shortening my takeoff roll on my 173 Elite RG with 
200 hp Lyc  and MT electric prop. 2 people & 40gal fuel take me about 2700 ft 
to  break ground at our 4000 ft elevation here in the winter at 50 degree  
temps and fully loaded in the summer much longer. So far I've added the  lower 
winglets and gained about 300 ft on takeoff roll and just put 6 pr  of vg on the 
outboard main wings, about 1/2 of the full recommended set.  Hope to test that 
when the wind quits blowing and then will possible ad  the full set on the 
main wings. may skip the canard or just put a few on  as I don't have trouble 
rotating, just getting the main wing to leave the  ground. will try your 
suggestions on the oil cooler and also a naca for  back seat ventilation that doesn't 
seem to have much air coming  through.

Thanks  again

Jim

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