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Seagull Turbo Raven

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Seagull Turbo Raven - 4/6/11

Seagull's Turbo Raven

Seagull's Turbo Raven

one year on..... - 6/6/12

David Ashby - Moderator02/12/2013 08:56:32
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10932 forum posts
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You do Jim, 5kgs will be fine.

Tom Ling31/07/2016 11:11:12
48 forum posts
3 photos

Hi guys Iv just brought the above model, i will be fitting an asp91 2 stroke. Would you say there is a correct CoG as I think il aim for about 130-135mm. Many thanks Tom.

Bill Foster14/01/2018 01:20:08
9 forum posts
10 photos

Seagull MANUALS available here;

Bill

Bill Foster16/04/2018 00:51:02
9 forum posts
10 photos

**LINK**

manual here...

Bill

Bill Foster16/04/2018 00:52:51
9 forum posts
10 photos

my build thread is here:

**LINK**

Bill

Julio Guilherme Nogueira Diana26/08/2018 01:25:41
1 forum posts
it is a nice flying model apart of that problem.Posted by Andrew Pirie on 27/06/2012 11:07:59

Take off roll, i have to feed the power in really slow all the way up to full power to avoid tipping. Once in the air its great.

The stalling i was referring to David was not connected with slow flight then whacking in full up elevator. Hard to explain really, say your flying along good speed straight and level, then feed in full up elevator to perform a loop..the plane simply snap rolls at the top of the loop. Its not always the same direction it snaps. This is leading me to think that its stalling a tip. It will loop fine if you do a wide loop. Presumably with a harsh elevator input its bleeding off too much speed in the loop.

Hope that makes sense???

Hello guys, I am having the exactly same problem with my Raven, it tip stall at the top of the loop, also she is dropping the left wingway before slow down, never saw a plane do that before, anyone had the same problem and have sorted out?

Bill Foster24/01/2020 03:44:05
9 forum posts
10 photos

Hey people..Happy 2020..!

Let's get the Seagull Turbo Raven thread revived...mine has not flown yet. Still a Hanger Queen!

Have been contacted by a fellow owner (Arnold) who is getting ready to maiden his second Raven.

Still lots of concern about that CG location.

Bill

Denis Watkins24/01/2020 05:48:57
4047 forum posts
75 photos

Hi Bill, even without the manual, the C of G of many ARTF

Is On or very near the wing tube.

The wing tube is usually built at the thickest part of the airfoil in

the middle of the aeroplane where strength is needed

 

You have the manual which states 145 mm from Leading edge

On the wing tube line

Which is a really good starting point for C of G

 

Edited By Denis Watkins on 24/01/2020 05:50:24

Bill Foster24/01/2020 06:24:10
9 forum posts
10 photos

Hi Dennis,

Yes, the "spar" or wing tube is usually a good place to look at, for the CG point, however with the long nose of this Raven, flyers are relating disasters with 145mm back from LE resulting in a tail heavy model.

Reviewer David Ashby uses 135mm...others go for 125mm for the maiden, and some go all the way to 110 mm from leading edge.

Apparently this situation is somewhat common with this manufacturer, and has occurred with other models they have released.

On another note, Seagull (the factory), had also stated this model would require a 4S lipo pack and fly with a 10/7 prop. Since the model is weighing in at 8.5 pounds, flyers are going with either 5S or 6S packs along with either 14" or 15" props and a nice round 1000 watt power system to properly fly this model.

Bill

Denis Watkins24/01/2020 14:31:02
4047 forum posts
75 photos

Seagull Turbo Raven

Wing span -------------------------59.8in (152cm).

Wing area --------------592.1sq.in (38.2sq dm).

Weight --------------------6.4 -7.1lbs (2.9-3.2kg).

Length ------------------------------51.2in (130cm).

Engine -------------.46 - .55 cu.in -----2-stroke.

.52 - .72cu.in -----4-stroke.

Radio ----------------- 4 channels with 5 servos

Help, in general

Most 5 foot span ARTF come out around 7lb AUW, and trainer style around 6lb

How have we got to 8.5lb on this 5 foot span beautiful airframe?

Edited By Denis Watkins on 24/01/2020 14:31:34

Arnold Atkins24/01/2020 14:36:22
15 forum posts
9 photos

Hi Bill, Small world...

I am in process of doing all the final checking and testing prior to the maiden flight this coming Saturday / Sunday (weather permitting - it is supposed to rain). I am not expecting any real issues and I am shooting for a CG in the 115 - 125mm from LE range.

I ordered the longer carbon fiber legs (170mm height) and found out China is doing their 2 week New Years Holiday. So, that will not be here anytime soon (two to three weeks --- ARG!).

The Maiden Battery will be a 6S 3400mah 75C unit and I have modified the battery platform to allow the pack to be more rearward if needed. The 1/2 throttle test gave me a 12 minute run time (full cycle). The 3/4 throttle test gave me a 9 minute full cycle run time.

Power system: 5065-400KV (.60) outrunner, 80A Opto esc, remote uBEC, 3 blade 14x7 Windsor prop and a 3.25" aluminum spinner sanded, primed and painted to match.

For the maiden flight I be using larger wheels/ tires without the wheel pants to gain a little nose height / prop clearance.

Stay tuned for the Maiden report...

<Arnold>

Bill Foster24/01/2020 22:21:56
9 forum posts
10 photos

Hi Arnold, I was hoping you would see that I came back to this thread....nice to see some more action here.

With regard to the question from Dennis, about how we get the weight of this model to 8.5 lbs ...could be a couple of things; the original weight listed was "fudged", and some of these 6S lipos weigh a pound or more themselves, and lastly, I'm guilty of this, some of us "build heavy"..! I have torn off too many landing gear blocks that it's usually the first thing I look at with a new model, and most require some additional beef to survive my grass field landings. It's so easy to do BEFORE you tear the gear loose..!

Bill

Arnold Atkins25/01/2020 14:45:42
15 forum posts
9 photos

Mine is built pretty light so far. Only additions are the cockpit mods and a spinner that weighs less than the heavy plastic OEM spinner. With the "Monster Power .60" and a 6S 3400mah battery, I am still struggling to get the CG back far enough (I am currently at 110mm and want it back to about 120 - 125mm. It is starting to look like the battery will be almost directly ON or BEHIND the CG where the RX is / was supposed to be. I may even have to turn the elevator and rudder servos around so the horns are to the rear to make more room. I am trying hard to not add tail weight in the rear "battery area". On TR-1 (Turbo Raven - 1) I had to add a bunch of lead in the tail to get close to the "145mm" mark. I think I wound up around 120mm. and went with that. I do not like adding dead weight. Todays task will be to modify the "RX" area to facilitate the battery and a hold down system. Looks like RX relocation and reroute the wiring as well. My goal is to get to the 120 - 125mm CG without adding any weight in the tail

Interesting project. Seagull kind of missed the whole concept of the Turbo Raven. Wayne's TR was truly a 3D aircraft. Light and SUPER powerful. I do not believe this model was designed with electric flight in mind at all.

Otherwise they would have put 3 servos back near the tail with short linkages and moved the battery area to the center of the airframe. IMHO... . I may have to do just that before I am done. Ultimately I will probably replace the heavy wing tube with a carbon version as well. Just extra weight.

<Arnold>

Arnold Atkins28/01/2020 16:54:01
15 forum posts
9 photos

OK,

After making a battery tray that connects the center servo plate and the rear servo plate, the 6S 3400mah battery is now securely strapped into the area just in front of the rudder and elevator servos. Now, if I need to add any weight to the rear compartment, it will be minimal.

The current weight with battery is now 7 lbs and 6 oz. With the heavy aluminum main gear legs being being replaced with much lighter Carbon fiber and the heavy aluminum wing tube also being replaced with carbon fiber, I just might get this bird down to 7 LBS or even slightly less. Moving and adding one servo under the tail would actually have added the weight of one additional servo. SO for the time being, I am going with the battery tray modification. I cannot understand how anyone can get this airframe to balance at the 145 - 135mm cg location without adding a ton of weight in the tail. Mine is built pretty much according to the manual and she came in massively nose heavy.

Now, if I can figure out how to post pictures in this thread I will do so...

<Arnold>

Bill Foster28/01/2020 21:32:42
9 forum posts
10 photos

Good point Arnold ..."how DO YOU post pictures on this thread..???????"

I thought it would be elementry, but No, I don't see the way to do this, so give us the steps, please..!

Bill

Arnold Atkins29/01/2020 19:03:12
15 forum posts
9 photos

Hi Bill,

Maybe we have to ask the folks that I had to ask to join the site.... There is a "image button", but it is NOT simplistic. It looks like they do not want any pictures posted. Maybe they are limited on forum storage. I can always just sent you a couple shots via email.

After doing a lot more work, I finally got her back on the balancer and found she was STILL nose heavy at the 125mm CG location. I added a 3 oz. fishing weight wrapped in soft foam in the "rear battery hatch" and this brought the CG to exactly 125mm. The 3400MAH 6S battery is now as far back as it can go without moving the servos to the tail area. All up weight is now 7 lbs and 9 oz.

Earlier in this forum, someone stated the wing tube is a good plane to start the CG at. The center of the wing tube is almost exactly on the 125mm from LE location. Maybe Seagull meant 125mm rather than 145mm. The 145mm from L.E. (Leading Edge) at the root looks pretty far aft to me. I may go find the CG and Center of Pressure calculator (on line) and plug in the numbers. It calculated the CG based on wing shape and includes the tail feathers. The Center of Pressure (center of lift) does not include the tail feathers and is based only on the main wing.

The good news is that I can always change the weight in the tail and I do not see myself trying to get all the way to 145mm. I am tempted to start at 120mm from LE.

I ordered the carbon fiber mains and the carbon fiber wing tube... Someday I will get them (slow boat from China mode shipping).

 

 

 

Edited By Arnold Atkins on 29/01/2020 19:06:33

Denis Watkins29/01/2020 20:24:15
4047 forum posts
75 photos
Posted by Arnold Atkins on 29/01/2020 19:03:12:

Hi Bill,

Maybe we have to ask the folks that I had to ask to join the site.... There is a "image button", but it is NOT simplistic. It looks like they do not want any pictures posted. Maybe they are limited on forum storage. I can always just sent you a couple shots via email.

Arnold

Sign in, and click on Albums on the top line. Create and name a new album

You have to put your photos into this Albumn

By adding photos, then SAVE

Photos are added to your comments/posts from this album

There is no real limit to the number correctly downloaded

Bill Foster30/01/2020 03:11:56
9 forum posts
10 photos

Arnold,

When I ordered my "tall CF gear" from China, I waited about 45 days and then submitted a complaint with the Paypal people (since I had used them for payment) Paypal went to bat, lodged my complaint, and "bingo", about a week or ten days later the gear showed up. I could not tell whether I got the original shipment or a second shipment; but I was impressed that PP got results for me.

I'd be interested in getting a link from you for the CF wing tube.

Also I'll try opening an "Album" here and drop some pics into it, and see what happens. Sounds like once you have pics in the Album you can source them when you need to include one or more in a post.

Bill

Arnold Atkins30/01/2020 19:18:33
15 forum posts
9 photos

Testing the waters.... These are obviously not of a Turbo Raven. But they are JPG format...

<Arnold>

twa sisters.jpg

Arnold Atkins30/01/2020 19:20:05
15 forum posts
9 photos

Yippie, It worked... !! Now to convert a few IOS format Turbo Raven pictures...

Stay tuned for updates...

<Arnold>

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