Ivan Pettigrew Planes - Build Threads and Videos - Page 231 - RC Groups
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May 11, 2018, 07:46 AM
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cracksmeup's Avatar
Quote:
Originally Posted by oscarmok
Hello,

Recently I bought a Twin Otter off someone from the net. He mentioned this is from Ivan Pettigrew Twin Otter 600 plan.

Unfortunately, I haven't ask what's the CG of this plane.

Can someone who built the Twin Otter 600 plan can tell me what's the CG of this plane please?

Greatly appreciated.
Oscar
I havenít finished mine yet as some health issues got in my way , I will get out my plans and check for you tomorrow tho . Joe
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May 11, 2018, 08:00 AM
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Quote:
Originally Posted by cracksmeup
I havenít finished mine yet as some health issues got in my way , I will get out my plans and check for you tomorrow tho . Joe
Much Appreciated, Joe!
May 11, 2018, 08:28 AM
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cracksmeup's Avatar
Quote:
Originally Posted by oscarmok
Much Appreciated, Joe!
No problem sir .. joe
May 14, 2018, 01:45 PM
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cracksmeup's Avatar
Quote:
Originally Posted by oscarmok
Much Appreciated, Joe!
Sorry for the late reply iam half way through building me a new workshop and hard to find stuff . The CG is 2 3/4 inches from the leading edge of your wing . Joe
Last edited by cracksmeup; May 14, 2018 at 01:51 PM.
May 14, 2018, 01:52 PM
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Joe, Much appreciated. Thank you.
May 14, 2018, 02:02 PM
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cracksmeup's Avatar
Quote:
Originally Posted by oscarmok
Joe, Much appreciated. Thank you.
Anytime sir anything for a Ivan’s plane flyer :-) iam getting back to building two more of his planes real soon . Joe
May 27, 2018, 03:08 AM
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Sealand Test Flight - Problems


I have tried a test flight on my Sealand. She is slightly nose heavy at 25% chord. On take off she climbed almost vertical. I got her level and a slight touch of the throttle and she was vertical again.

It is quite difficult to measure the thrust line of the motors but it seems close to plan.

Can anyone advise me on sorting this out ?

Leslie
May 27, 2018, 03:19 AM
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Trevorh's Avatar
Thrust line is unlikely to be an issue. I suspect that you have too much up trim.

Trim it to fly level nice and slowly then just push forwards into a shallow dive and release the stick. If it pitches up sharply, you now know that the pitching is due to increased speed not thrust. This would be a sure sign that the model is nose heavy, so is requiring too much uptrim to fly level at low speed. Go faster and this uptrim pitches you up.

Trevor
May 27, 2018, 07:16 AM
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Thanks. I will check it later in the week.
May 27, 2018, 03:59 PM
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cracksmeup's Avatar
Quote:
Originally Posted by leslie_ward
I have tried a test flight on my Sealand. She is slightly nose heavy at 25% chord. On take off she climbed almost vertical. I got her level and a slight touch of the throttle and she was vertical again.

It is quite difficult to measure the thrust line of the motors but it seems close to plan.

Can anyone advise me on sorting this out ?

Leslie
incidence meter . It was long ago but think my larger Ivan’s Short Solent was 2 degrees down thrust on all motors . 0 on fuse thurst center line . If Ivan drew it the degrees of everything is on his plans . Hope this helps I didn’t buy his Sealand plan yet but I will some day .My Solent flys with a touch of down trim and sensitive to controls . Joe
Last edited by cracksmeup; May 27, 2018 at 04:11 PM.
May 29, 2018, 04:09 PM
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LukeZ's Avatar
As most know the annual spring Chilliwack fly-in was this past weekend. There is an event thread here and photos are starting to trickle in.

Mike has also given a report based on emails from Ivan which you can read here in the Bimbo thread.
Jun 15, 2018, 01:36 AM
What could possibly go wrong?
nickchud's Avatar
Here's my Dragonfly. Getting the hang of it now. She definitely needs some power to keep the nose up on landing.

Jun 15, 2018, 07:44 AM
Slip the surly bonds...
Sopwith Mike's Avatar
Lovely photo, lovely model. Looks like DH graduated to long trousers!
Jun 16, 2018, 01:40 AM
...design-build-fly-publish...
eye4wings's Avatar
That's classic nose heavy behaviour Nick. I would sneak the batteries aft a smidge at a time until that goes away.
Doesn't the DH90 look gorgeous in the air though?!
Robin


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