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A scratch built Wasp from RCM plans

Old 10-23-2008, 03:02 AM
  #176  
pburt1975
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Originally Posted by Slowjohn View Post
That reminds me of something I was told so many times in my youth. Something about there was always time to do it right the first time if there was time to do it over a second time.

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Thats a statement I can agree with, cant say I follow it all the time, but totally agree!!
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Old 10-23-2008, 03:13 AM
  #177  
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Originally Posted by pburt1975 View Post
Thats a statement I can agree with, cant say I follow it all the time, but totally agree!!
Same thing here . Too bad these things don't all have crystal balls so we could see where the problems were going to be

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Old 05-29-2010, 02:18 AM
  #178  
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Hi,

Time to revive this thread.

Can anyone recommend the optimum CG for the Leisure Wasp?

Thanks in advance for any replies.

Regards,

Anthony
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Old 05-29-2010, 03:48 AM
  #179  
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I sold mine last summer and I don't have the plans anymore...maybe John will remember. If not we can figure out a good starting point by the dimensions of the wing.
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Old 05-29-2010, 03:55 AM
  #180  
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Originally Posted by smokejohnson View Post
I sold mine last summer and I don't have the plans anymore...maybe John will remember. If not we can figure out a good starting point by the dimensions of the wing.
Thanks for the reply,

The wing chord is 8" and I am balancing at 2.5" aft of the L/E or 31.25% back

Regards,

Anthony
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Old 05-29-2010, 05:26 AM
  #181  
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Originally Posted by All American View Post
Thanks for the reply,

The wing chord is 8" and I am balancing at 2.5" aft of the L/E or 31.25% back

Regards,

Anthony

Hi Anthony,

The CG will be around 2"~2.25" back from the L.E.
With that style of wing a good starting point is 25% of the wings chord. Most of the time you won't even have to try anything else.

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SJ
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Old 05-29-2010, 12:09 PM
  #182  
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Originally Posted by Slowjohn View Post
Hi Anthony,

The CG will be around 2"~2.25" back from the L.E.
With that style of wing a good starting point is 25% of the wings chord. Most of the time you won't even have to try anything else.

Standing By,
SJ

Hey there John,

Thanks for the reply. I am finally ready to get some air under her feathers.

I was trying to get the CG at 2" but ended up at 2.5" It looks like I need some nose weight. The battery is as far forward as possible and so is the ESC.

Do you remember what you used for covering? I need to pick up some of the yellow and purple.

Regards,

Anthony
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Old 05-29-2010, 12:29 PM
  #183  
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Thinking back I needed to add extra weight up front to get mine to balance so that sounds about right.
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Old 05-29-2010, 12:51 PM
  #184  
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Good Morning Anthony,

Glad your about ready to try her out. I'm sure you'll like the way she flies. You can set it up mild or wild or anywhere in-between. You might want to email Jeff at HURC & ask him about what all he's tried with the one I sold him. He tells me that he's very happy with it and loves the way it flies. You can reach him thru his website at www.headsuprc.com or at [email protected]

Sorry, I'm not sure what the covering is as I got it in a "Lot" buy on eBay several years ago. I'm fairly sure that the purple was Monokote but I can't be positive as only a few rolls had any ID as to what it was. Most of the rolls were partial rolls to start with. I do remember though that it was a heavier/thicker covering so it's more than likely Monokote. The Yellow I don't have a clue but it too was thicker/heavier than Econokote so...

Let me know how she flies for you.

Standing By,
SJ
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Old 05-29-2010, 08:29 PM
  #185  
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Took her up this morning. I got her to balance without extra weight by using something I have very little of; patience.


With the CG at 2.25" aft of the L/E it flew beautifully, with exception!

SJ, You did a really nice job on this plane! It flew straight and true, the sign of a well-constructed airframe.

The power was anemic though and I had to fly WOT to keep her up. If I cut the throttle, the glide was straight and it did not just stall and fall. Therefore, I can tell the CG was dead on, not nose heavy.

I flew with the GWS EP 9070 x 3 you provided.

Batteries, fresh from Jeff at Heads Up are 3S 20C 1500 Mah.

Watts Up Meter readings:

145 Peak Watts and 12.5 Peak amps.

Wing loading is "Trainer Low" at 12.16 oz. per sq ft.

AUW 25 oz. Approx 93 watts per pound.

I think it's under propped or the motor is not up to the task. Do you have any old notes regarding which motor you installed? I don't want to cook the motor by over propping and without knowing what Outrunner is installed I'm in the dark.

Regards,

Anthony
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Old 05-29-2010, 10:12 PM
  #186  
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Hi Anthony,
So glad it flew good for you. I can't find any of the notes I had on it when doing the prop testing but I seem to recall that it needed a larger dia. prop & that's why I was using the 3-bladed props on it b/c of a ground clearance issue I think. I don't recall which motor that is at all. If you can take a picture of it & get it's measurements & email them to Jeff at HURC then maybe he can tell you what it is since I got it from him I'm sure.

I'll keep looking & trying to remember but it's been a long time since I last flew that one.

Standing By,
SJ
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Old 05-30-2010, 01:16 AM
  #187  
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Originally Posted by Slowjohn View Post
Hi Anthony,
So glad it flew good for you. I can't find any of the notes I had on it when doing the prop testing but I seem to recall that it needed a larger dia. prop & that's why I was using the 3-bladed props on it b/c of a ground clearance issue I think. I don't recall which motor that is at all. If you can take a picture of it & get it's measurements & email them to Jeff at HURC then maybe he can tell you what it is since I got it from him I'm sure.

I'll keep looking & trying to remember but it's been a long time since I last flew that one.

Standing By,
SJ

Thanks buddy!

Regards,

Anthony
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