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RE: My first Herr extra - 5/3/2008 2:16:17 PM   
N1EDM



Posts: 1899
Joined: 7/19/2002
From: Brockton, MA, USA
Status: offline 		I've got the Mini-Extra (teal) with a blue OS-10LA in it... Howdyalilke that? The motor color-matches the airplane (can't find blue OS-10LA's any more).

I fly this with a 8x4 wood prop and 20% nitro... it flies OK, but it's not a fire breather. It's a sport plane, good for boring holes in the sky, but I like it.

I tried to put a 15 in at first, but it didn't look like I'd be able to do it without a lot of hacking - not much room where they had originally specified a .074 for that thing. How about you guys with the 15's up front? Can you send a picture of the engine installation? I'm wondering if the plane turned out tail heavy or not.

I might try a 7x6 on the 10 to see if the speed improves.

Bob

< Message edited by N1EDM -- 5/3/2008 2:17:14 PM >

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       Post #: 26

RE: My first Herr extra - 5/3/2008 3:25:54 PM   
microsprint9



Posts: 411
Joined: 11/20/2004
From: london, ON, CANADA
Status: offline 		Actually my Magnum .15XL fit great, i think i only had to sand about 1/32" off both sides of the opening for the engine, even the pre drilled bolt holes in the 1/4" ply fit. I used the stock 2oz tank and AUW was 29oz dry, CG was perfect with my 300mah 4 cell RX pack mounted at the back of the canopy opening. My radio went for a crap ( all fixed now ) and caused my lil extra to go in hard, the snow soften the blow so it's now in the rebuilding stages. The only hard part was making a 1/4 exhaust extender so the muffler would clear the fuse without any hacking.

< Message edited by microsprint9 -- 5/3/2008 3:30:00 PM >

(in reply to N1EDM)
       Post #: 27

RE: My first Herr extra - 5/3/2008 3:50:06 PM   
N1EDM



Posts: 1899
Joined: 7/19/2002
From: Brockton, MA, USA
Status: offline 		Kerwin,

As a thought on your Sig SE, before you change engines, try going with a 12x4 prop instead. I went from a 11x6 to a 12x4 in my Twist 40 and the difference was amazing. You may find that you don't need to change engines after all.

Just a thought,

Bob


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An expert is someone who has been doing it for 15 minutes longer than you.

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       Post #: 28

RE: My first Herr extra - 5/3/2008 3:51:55 PM   
N1EDM



Posts: 1899
Joined: 7/19/2002
From: Brockton, MA, USA
Status: offline 		Hi Microspring,

Thanks for that recap. Sorry about your plane - that happened to my LT-40.

As for the exhaust, I had to do the same thing with my OS-10 to get the muffler to clear the fuse.

Hmmm, I wonder what I was doing wrong that made my .15 so hard to fit on the Herr mini?

Bob

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RE: My first Herr extra - 5/3/2008 7:14:20 PM   
kerwin50


 

Posts: 424
Joined: 10/18/2006
From: winston, MO, USA
Status: offline 		I am using a 12-4 on my sse right now but am going to a 12.25-3.75.
N1EDM have you visited the TWIST fourm under the arf section. I too have a twist 40 but with an os 61 fx on her. she has super amounts of power I can do vertical take offs with her lol

(in reply to N1EDM)
       Post #: 30

RE: My first Herr extra - 5/3/2008 10:45:36 PM   
flyinrog



Posts: 5742
Joined: 9/3/2002
From: Burlington, NC, USA
Status: offline
quote:

ORIGINAL: microsprint9

Actually my Magnum .15XL fit great, i think i only had to sand about 1/32" off both sides of the opening for the engine, even the pre drilled bolt holes in the 1/4" ply fit. I used the stock 2oz tank and AUW was 29oz dry, CG was perfect with my 300mah 4 cell RX pack mounted at the back of the canopy opening. My radio went for a crap ( all fixed now ) and caused my lil extra to go in hard, the snow soften the blow so it's now in the rebuilding stages. The only hard part was making a 1/4 exhaust extender so the muffler would clear the fuse without any hacking.


What he said the .15 is only 1 mm wider than the .10 in the LA series....Rog

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       Post #: 31

RE: My first Herr extra - 5/3/2008 11:16:38 PM   
microsprint9



Posts: 411
Joined: 11/20/2004
From: london, ON, CANADA
Status: offline
quote:

ORIGINAL: kerwin50

I am using a 12-4 on my sse right now but am going to a 12.25-3.75.
N1EDM have you visited the TWIST fourm under the arf section. I too have a twist 40 but with an os 61 fx on her. she has super amounts of power I can do vertical take offs with her lol


Sorry, i know this is off topic but i'm happy to say that my TWIST will do the same with a TT PRO.46, it will take off vertically right out of my hand. ( broke the gear off one day ) Tons of power and it's just under 5lbs.

< Message edited by microsprint9 -- 5/3/2008 11:17:27 PM >

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       Post #: 32

RE: My first Herr extra - 5/4/2008 1:32:38 AM   
RocketRob



Posts: 668
Joined: 12/27/2002
From: San Francisco, CA, USA
Status: offline 		Finished her up this afternoon[)]

She was rode hard and put away

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       Post #: 33

RE: My first Herr extra - 5/4/2008 1:41:32 AM   
flyinrog



Posts: 5742
Joined: 9/3/2002
From: Burlington, NC, USA
Status: offline
quote:

ORIGINAL: RocketRob

Finished her up this afternoon[)]

She was rode hard and put away



Sorry dude, but hey, there only $60,, get another one...I had one of those Norvel .15's never started it, now I cant remember what I did with it....Rog

_____________________________

Ever walk into a room and forget what you went in for?...ADHD, welcome to my world,it happens everyday!

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       Post #: 34

RE: My first Herr extra - 5/4/2008 2:08:25 AM   
mylamo


 

Posts: 365
Joined: 9/19/2003
From: Mission, TX, USA
Status: offline 		For that OS .10 try a 7X4 or 8X3, lot of difference with
the RPM up where it belongs.
Rob,is that a symetrical LG ?
Ralph

(in reply to flyinrog)
       Post #: 35

RE: My first Herr extra - 5/4/2008 5:07:11 PM   
hogflyer



Posts: 1445
Joined: 3/23/2005
From: Wichita, KS, USA
Status: offline
quote:

ORIGINAL: RocketRob

Finished her up this afternoon[)]

She was rode hard and put away


Bummer. Looks like it wasn't a good day for Li'l Extra's.

Took mine off on the maiden - relaxed the elevator and leveled out at 3' to build up speed before starting to climb and it went into a viscous double snap roll to the right after flying level for about 150' with no control input. Tore the wing off, cracked the aft half of the fuselage and stripped the gears on both aileron servo. I did notice the parts that broke loose - especially the wing hold down plate - had glue joint failure, not wood failure. Surprisingly there was no damage to the wing or forward fuselage. Where it took the impact on the nose only the prop broke - there was a lot grass and dirt all around the engine but the cheeks came out intact. Even the nylon hold down bolt sheered off flush with the tee-nut like it was supposed to.

Luckily mine is an easy rebuild and I should have it out to re-maiden in a couple of weeks. Not sure what caused it to snap like that - we think it may have been hit, but Berg receivers are also good at blocking interference. We'll probably never know - just one of those things.

Hogflyer

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       Post #: 36

RE: My first Herr extra - 5/4/2008 10:43:19 PM   
N1EDM



Posts: 1899
Joined: 7/19/2002
From: Brockton, MA, USA
Status: offline 		Hi Hogflyer,
Sorry about the loss, but glad that it's rebuildable.

I'm gonna guess that you had a .15 in it... mine only has a .10LA - but I did notice one thing. The ailerons were very twitchy (I was a bit surprised) even for such a small airplane and power plant. I had to dial in a fair amount of expo to tame it down. The elevator and rudder seemed OK, but the ailerons were sensitive.

I wonder if that is what you might have been seeing... just a thought.

Bob

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RE: My first Herr extra - 5/4/2008 11:20:49 PM   
hogflyer



Posts: 1445
Joined: 3/23/2005
From: Wichita, KS, USA
Status: offline 		Bob -

Actually an OS .10 FP w/ MAS 7 X 4 for the maiden, and it was airborne in around 75' - 100' on grass, which I guess is an OK distance. My plan is to replace the FP with an OS .10 FSR after I can get some bench time on it, then after about 25 flights add a tuned pipe (once its well broken in). Since I was expecting the ailerons to be sensitive due to all that area, I had -25% expo dialed in (Futaba 7C transmitter) and the throws set exactly to the manual.

Not sure what got to it i the snap roll, but is was one of the best double snaps I've been at the sticks for - intentional or not.

Does anybody know if the Sig AeroKoke Violet will match the AeroKoke Light Sig/Herr uses? I can't find the light on either Sig's or Herr's website, and Tower only shows the standard. I'd hate to have to pay the LHS $18.00 for a roll of each - that would be half the cost of a kit from tower and I'd be better off getting another one just for the fuselage if covering will cost $36.00.

Hogflyer


_____________________________

Flight Training Coordinator - Wichita Radio Control Club - AMA Intro Pilot
www.wichitaradiocontrolclub.org AMA 47317

(in reply to N1EDM)
       Post #: 38

RE: My first Herr extra - 5/5/2008 12:11:20 AM   
N1EDM



Posts: 1899
Joined: 7/19/2002
From: Brockton, MA, USA
Status: offline 		Thanks for the suggestion, hogflyer. I was using a 8x4 prop and that seemed to load the motor down, even though it is a recommended prop. I'll try that 7x4 to see how it revs up...

Bob

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An expert is someone who has been doing it for 15 minutes longer than you.

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       Post #: 39

RE: My first Herr extra - 5/5/2008 2:35:04 AM   
tadeu


 

Posts: 10
Joined: 1/17/2005
From: campinas-sao paulo, BRAZIL
Status: offline 		Hi folks,

I'm using in my little extra the folows:

.15LA OS engine
8x4 APC prop
Berg 7P receiver
250mA NiCad bat pack- aprox.
28oz on the tail in order to correct CG
HS-55 Hitec mini servos
4oz. fuel tank - aprox. 10 minutes.

Until now, this airmodel flies good.

Tadeu

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