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Seagull radial rocket

Has anyone got or owned one?

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Tom Ling12/05/2016 14:34:09
48 forum posts
3 photos

Hi guys I'm looking at a seagull radial rocket for a 90 2 stroke should fit in nicely and it looks a nice plane but has anyone got any reviews of it on here? Thanks tom.

Percy Verance12/05/2016 14:59:14
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8108 forum posts
155 photos

RCM&E did a review not long ago Tom.........

If I remember correctly, the undercarriage was a bit weak. That is sometimes a problem with artf's though.

Tom Ling12/05/2016 15:30:15
48 forum posts
3 photos

Ahh thanks il try and find the review, yer it does look a little bit on the week side but they all have the bad points, as long as it's not actually a bad design hopefully it will stand up.

Pete B - Moderator12/05/2016 16:38:15
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Moderator
7588 forum posts
732 photos

Sept 2015 edition...

Pete

Tom Ling13/05/2016 15:48:54
48 forum posts
3 photos

Thanks guys I must of missed that one, have read it and it does look smart, just need to open up the cowl and be gentle on landings!!

Ron Gray09/09/2018 11:15:48
1499 forum posts
363 photos

My wife bought one for me for my birthday a week ago, am planning on fitting a Laser 100. Is there any interest in a build blog of it bearing in mind it's another ARTF rather than a plan or kit build?

Ron Gray23/11/2018 22:30:30
1499 forum posts
363 photos

I decided to put together a few shots of the assembly (well its hardly a build!) of the Seagull Radial Rocket, but more importantly my modification to the U/C!

General construction is first class, unlike the Seagull P40 I had!

Inside2.jpg

Plenty of glue appears to have been used and good strengthening to the bulkhead, which is good as I planned on using a Laser 100 to power it.

Inside1.jpg

Control surfaces were hinged using the supplied furry mylar hinges and CA, I use Vaseline to protect the covering to prevent it 'milking' with CA fumes. I also make sure that there is only a very small gap between the surfaces.

Hinge2.jpg

Hinge1.jpg

Control horns were an issue, whilst fine for the rudder they are much too big for the wings and needed to be cut down.

Horns.jpg

They also needed the glued portion to be shortened otherwise they pushed against the film covering.

Servo_mount3.jpg

Servo trays appeared to have plenty of glue and good strengthening

Servo_mount1.jpg

Next I needed to source the servos from my servo drawer

Servos.jpg

With servos fitted it was obvious that the output arm slots needed to be reformed as the arms fouled the pre cut ones

Servo_mount4.jpg

Out with the Dremel

Servo_mount5.jpg

Tim A23/11/2018 22:38:25
217 forum posts
11 photos

Keep the info coming Ron I am watching with interest. One thing I have noticed from the manual (won't get the plane til January) is that the servo mounts appear to be sized for Futaba standard servos, I use Hitec ones which are fractionally smaller so some mods may be required.

Ron Gray23/11/2018 22:44:03
1499 forum posts
363 photos

Next to check was the elevator joining wire, I've very rarely come across one that has been formed correctly, not sure if you can see the unequal bends in this photo.

Ele_wire1.jpg

Back to the servos, extension leads fitted, I remove the outer casings and use heat shrink

Servo_cable.jpg

And SBUS used to reduce the number of connections necessary to the Rx (FrSky X4)

Sbus.jpg

Turning attention to the engine, the Laser 100, whilst a large(ish) engine fits quite nicely in that big cowl and I decided to fit it 'sidewinder' with no silencer, just flexi exhaust. This has now been changed and there is a remote silencer in there now!

Engine1.jpeg

The cowl needed baffles to aid engine cooling, mine is made out of balsa

Baffle1.jpeg

And a print of a radial engine stuck to the front and then the whole lot fuel proofed.

baffle2.jpeg

Baffle3.jpeg

Cylinder head cut out isn't too obvious. well not from a distance it isn't!

cowl1.jpg

And the finished 'plane waiting for its maiden flight

Rocket.jpeg

Ron Gray23/11/2018 22:53:09
1499 forum posts
363 photos

Now the maiden flight was excellent, a bit too much throw on the elevator but all other controls fine and very little trimming required apart from a bit of ballooning when flaps were deployed (now sorted with down elevator mix).

BUT the landings............or more to the point the U/C. What a poor design they are. The first landing was fine but the second landing saw one leg pull its mounting block out of the wing, no major damage and the block was duly stuck back in with a healthy amount of epoxy. The following week I took it out again and on its third landing I decided to use the grass strip next to our tarmac (it looks nice on grass was my reasoning). Big mistake, out popped the U/C mounting block which put paid to the flying for that day.

The problem with the U/C is that there is no give whatsoever in it, you can see what I mean from this photo

648dbec0-ec44-4e8d-82dc-3416ebf176a1.jpeg

And this is mounted to a block which is stuck into the wing

02c838de-8a69-4ff5-a211-d861a758d238.jpeg

And that's the bit that pulls out causing this damage

9ec75cee-f0e8-47b0-8de3-0d6d230557cc.jpeg

e62ff3bd-59f0-44b4-93b3-c9f5d4bb0d3b.jpeg

Next instalment is how I have modified the U/C

Ron Gray24/11/2018 16:23:48
1499 forum posts
363 photos

OK so having had a couple of flights where the U/C pulled out from the wing I decided that a better form of U/C was necessary and to this end decided on a torsion bar type fitting. This involved removing the parts of the U/C that plugged into the wing and fixing two extensions to the legs at 90 degrees with end bent down to plug into a new hardwood support mounted to the wing.

Hardwood support with groove for torsion bar part of U/C (holes at end of bearer were too near the end).

7c41a374-7f52-4687-8b08-442d17909077.jpeg

Recovered front wing section with sheet balsa

15a1e162-d032-40db-8bae-0a4ea4bc0c8e.jpeg

Then recovered wing section

1d27e812-cbb7-40f7-9d93-42517de0b30b.jpeg

U/C fitted and clamped in position

080b9b1e-81a3-4bcc-af49-05c5209b8fac.jpeg

Finished job

43d23714-3d31-414b-abeb-708475c1ab10.jpeg

Actually that wasn't the finished job! I took it out again but it had a nasty tendency to nose over both on take off and landing so I bent the legs forward by about 5 degrees, now it is absolutely steady. I also changed the wheels for slightly larger, low bounce ones and this has now transformed the Rocket.

In terms of flying, all I can say is that with the Laser 100 up front its certainly lives up to its name and flying it Reno racer style (which is what this model is based on) is great fun, pylon turns at full throttle are great fun. I have also found that the flaps are a must if there is little wind blowing to slow it down.

In conclusion, having made the U/C mods I now have a 'plane that is a joy to fly and a great adrenaline rush!

Graeme Poke16/07/2019 03:26:25
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175 forum posts
20 photos

Hi Ron,

I am interested in buying a Radial Rocket. I have a Saito 80 and was wondering if it would have sufficient power to do justice to scale flying given that it is a Reno racer. And any comments you may have on the model. Are you happy with it? Any thoughts please? Cheers Graeme

Ron Gray16/07/2019 07:09:01
1499 forum posts
363 photos

Hi Graeme

i would think that the Saito will be fine, I purposely overpowered mine with the Laser 100, it would be happy with the 80, because I wanted a ‘speed machine’! It’s good fun flying it and steeply banked high speed turns are a joy. The big problem is the u/c, the design of the gear is very poor and is prone to pulling out as you can see from my earlier photos. The torsion bar mod that I made improved it no end but I also raked the legs forward a bit more to help prevent nose overs. Also watch that the spats don’t catch on the wheels, mine did and caused a nose over which damaged the cowl!

Graeme Poke16/07/2019 10:25:29
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175 forum posts
20 photos

Thanks Ron, I'll give it a bit more thought before committing. In other words, talk myself out of it.

I am due for a tax return so I'll see how that goes. All the best Graeme

Bob Cotsford16/07/2019 10:40:38
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8045 forum posts
444 photos

As this threads has been Lazarused, I'll add a question for Ron. How have you engineered the leg covers to cope with the radial movement? There doesn't appear to be much clearance between the tops and the wing underside. I have a Blackhorse Provost which I've done a similar torque rod mod on but so far I've not tried to refit the leg fairings due to the need to think out a mounting system for attaching them to the oleo and wing.

Ron Gray16/07/2019 19:18:02
1499 forum posts
363 photos

Well spotted Bob! I cut the top of the leg covers back at a slight angle (not shown in the photos above) then stuck on some white Solartrim to cover the gap. Being flexible the Solartrim deforms / reforms as necessary. By the way, the fairings are attached to the legs by means of a hardwood block which has a groove in it and is fixed to the legs with saddle clamps, the fairings are then mounted to the blocks with 2 small screws.

Bob Cotsford17/07/2019 23:44:03
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8045 forum posts
444 photos

Cheers Ron. If I can find the Provost's 'trousers' I'll see about fitting them again.

Lubomir Bakalov01/10/2019 12:11:50
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1 forum posts

Subscribed!
I've got one.
Guys
Can you share, please, the used servos, thank and AUW.
Where is your CG and how it is going with?
What engine will confirm the name? frown

I have SC FS61AR, OS FX61, SK110, SC FS120AR, RCGF20,
but suppose the engine weight of around 1kg will be not good idea for balance.

Thank you in advance!

Tim A28/10/2019 01:25:15
217 forum posts
11 photos

Ron, finally got mine to the almost ready to fly stage (had a lot of interruptions over winter, not much building or flying done!). I also encountered the same problems in the build/assembly? as you did.

Would be interested to know where your CG ended up? Mine is 15mm forward of the 88mm mark as per MFS. To move it back I will have to cut the servo platform in order to move the 5S battery back any further. Don't wish to add any further weight if it can be helped as it weighs 7lbs 7oz at the moment. Although it has plenty of power at approx 140 watts per lb.

Thanks the CG the last thing to sort before I go and rip the undercarriage legs out.

 

Edited By Tim A on 28/10/2019 01:26:02

Ron Gray28/10/2019 07:18:40
1499 forum posts
363 photos

I’ll check it out later on today. The u/c is still a PITA, I’ve ended up raking mine forward to prevent nose overs.

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