Clipped, Electric weight, E-Impact first flights

Tue Jun 14 07:47:31 AKDT 2005

Or like a boxcar with 2 flat wheels........................... :-P Bill 
Glaze

rcaerobob at cox.net wrote:

>THAT's an easy one, Jim.  Most of my airplanes DO "fly like Trucks", or buses, or ....
>  
>
>>From: Jim_Woodward at beaerospace.com
>>Date: 2005/06/14 Tue AM 09:48:03 EDT
>>To: discussion at nsrca.org
>>Subject: Re: Clipped, Electric weight, E-Impact first flights
>>
>>Hi Lance, 
>>
>>I'll just say one thing that has stuck with me -  which is my analogy to a 
>>lot of themes which I can't remember word for word.  If your plane doesn't 
>>drive lines with a stability or determination reminiscent of a freight 
>>train or loaded diesel truck, your plane is not flying as well as it can. 
>>
>>Jim W.
>>
>>
>>
>>
>>
>>patterndude at comcast.net 
>>Sent by: discussion-request at nsrca.org
>>06/13/2005 05:11 PM
>>Please respond to
>>discussion at nsrca.org
>>
>>
>>To
>>discussion at nsrca.org
>>cc
>>
>>Subject
>>Re: Clipped, Electric weight, E-Impact first flights
>>
>>
>>
>>
>>
>>
>>Excellent post.  so what did Tony F say about trimming that you can apply 
>>to all planes?
>>--Lance
>> 
>>--
>>District 6 AVP 
>>www.aeroslave.com
>> 
>>-------------- Original message -------------- 
>>
>>(2nd attempt) 
>>Jim O., 
>>
>>I'm not sure what gear box I have, as I'm not really familiar with the 
>>previous Hacker motors.  I do see some bolt heads on the back of the 
>>motor, which would suggest to me that they run through the motor and into 
>>the gear box in the front.  At the front of the gear box, all you see is 
>>the bearing with the actual receiving holes for the motor-mounting screws. 
>>  
>>
>>I flew the Impact 4 flights this weekend.  I did this while flying my 
>>Aggressor, and breaking in a new OS 140 RX.  It was one of the funnest, 
>>BEST pattern day's I've ever had.  I flew the E-Impact and immediately 
>>liked the power and speed control (and ease).  The Impact itself, didn't 
>>jump off the board as a perfectly trimmed plane, so I knew I had a little 
>>work to do.  After the first flight, the concept was DEFINITELY proven, 
>>and I quickly deduced that I need more batteries (first flight was 
>>Saturday evening).  After this first flight (with John B. from Surinam 
>>watching), we determined the need to paint the bottom of the wings and 
>>canopy.  We ran to Lowes and bought some florescent red/orange to paint 
>>the stab and wing tips, and we also painted the canopy metallic silver. 
>>Also determined that the plane was tail heavy quite a bit.  Anyone 
>>familiar with the Impact thread on RCU knows exactly what I'm talking 
>>about in regards to the Impact.   
>>
>>Sunday morning with CG moved forward, the plane flew better and the small 
>>amount of color we put on the plane definitely made a huge difference. 
>>After this second flight, also determined that the CG was still too far 
>>aft, and that the battery needed to be moved forward (at this point, knife 
>>edge needed no mixing), and the plane was carrying a small amount of 
>>aileron trim.   
>>
>>Then, I flew the Aggressor for the first flight with the OS 140 RX and 
>>17x10 APC.  With th 17x10, the OS was nearly "super-sonic" compared to the 
>>Impact, however immediately, the Aggressor's trimmed status and 
>>"locked-on" look/feel was evident (as anyone who has seen the plane fly in 
>>D3 would attest to.  Due to charging time of the E-Impact, I swapped props 
>>to the Mez 18x10, adjusted the throttle curve, and started moving the 
>>speed envelope of the Aggressor down to match the Impact in a couple more 
>>flights.  My first thought was that if I had the E-setup in the Aggressor, 
>>it would be an unstoppable machine!  (Aggressor weight without fuel is 10 
>>lbs 13 oz). 
>>
>>Time for another flight on the Impact.  I flew through PO5 this time, and 
>>started getting used to the E-power curve, some rates, etc.  The forward 
>>CG move started to pay off, and the plane was drawing better lines (but 
>>still not like my glow plane, which is understandable as this was only the 
>>third flight on the model). After this flight, again, decided the CG 
>>needed to go MORE forward.  Also, we determined that the right wing tip 
>>needed about 14 grams of weight to laterally balance the model (a step I 
>>did not do in the garage, we added the tip weight at the field). 
>>
>>Back to the Aggressor:  I flew two more flight back to back on the 
>>Aggressor, each time improving the throttle curve to make it easier to 
>>match the envelop of the Impact.  The OS ran perfect, and I'm sad that 
>>after 5 years of screwing with other engines, to have not just spent the 
>>little bit of extra money and ran the OS all along.  Through each flight 
>>(90 degrees, 90% humidity), the OS ran superb.  Inflight throttling was 
>>great, you could tell the motor was not getting hot, and it was making 
>>ridiculous vertical power.  (by the way, this was on an OS A5 plug, C.P. 
>>25% pro-pattern, and ES pipe).  The OS runs VERY smooth with a crazy low 
>>idle.  I'm VERY happy with how it ran - not a single dead stick through 
>>its first 5 flights - nothing but awesome performance.  The locked in 
>>(trimmed) status of the Aggressor, now flying in the slower speed 
>>enveloped, had convinced John that this was still the "ticket" as compared 
>>to where the Impact was after 3 flights. 
>>
>>Back to the E-Impact!!!!!!!!!!  For this flight, the 6000 Pro-Lite T.P. 
>>battery was moved as far forward as possible (just behind motor).  This 
>>flight showed some incredible potential.  In this CG config., the Impact 
>>was driving lines similar to the Aggressor (up, down, 45's, etc), and 
>>rolling VERY well.  Also, the wing tip weight on the right wing made EVERY 
>>SINGLE MANEUVER look better.  The wings were much more locked on, the 
>>plane rolled better, exited snaps better, spinned better.  This was a 
>>great trimming lesson to me, as the day was getting cross-windy (worse) 
>>through out the day as the ruminants of the tropical storm passed through, 
>>however in the worsening conditions, this was the BEST of the flights.. 
>>After this flight, John immediately was convinced that this was indeed 
>>going to be a solid backup or first plane for the nats.  I'm still going 
>>to move the receiver battery forward now though, and probably make a 
>>lighter rudder (which wouldn't hurt things anyway).  (hacker controller 
>>has 3 degrees timing). 
>>
>>Charging:  I alternated by charging from the car battery, then letting the 
>>car idle for the next charge (guess what - no big deal to do this if 
>>necessary).  However my limitation is that I only have one Astro 109 as 
>>the second one has not arrived yet.  Thus, instead of 45 minute turnaround 
>>times, I was 1.5 hrs between flights. 
>>
>>Impact:  I followed some RCU advice and started with a CG on the center of 
>>the wing tube, without wings on.  This is in serious error.  However, the 
>>plane will dive mildly when in inverted flight, and it gives the 
>>impression through simple tests that the CG is correct.  With this CG, the 
>>plane flys off the tail.  In radius, the tails squats and the plane will 
>>fly tail low.  After I was done with it, the plane was following the nose, 
>>driving excellent lines, similar to the Aggressor (still thanking Tony F. 
>>for the trimming help on my Lazulite,which has now gone into all my 
>>planes!). 
>>
>>Glow / Electric:  In a quick comparison, a trimmed plane is what you need. 
>> Electric power itself will help with presentation and probably hide some 
>>airplane tendencies (if bad), due to the smaller speed envelope. Although, 
>>the power and the plane are working together, they are still a bit 
>>separate.  I guess I'm trying to say that a poorly trimmed plane is going 
>>to hurt you no matter what motor you have in it.  I'm guessing purely 
>>guessing now though, that if two identical planes, both completely 
>>trimmed, were equipped with glow and electric, that the E-setup would take 
>>the cake as it would allow more of a "show-casing" of the maneuver set. 
>>More to follow......... 
>>
>>Thanks, welcome questions, comments, public or private. 
>>
>>Jim W. 
>>
>>
>>
>>    
>>
>
>Bob Pastorello, El Reno, OK, USA
>rcaerobob at cox.net
>www.rcaerobats.net
>
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