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Seagull DH-98 Mosquito engine choice

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Denis Watkins20/05/2018 10:15:43
3133 forum posts
144 photos

Look at the Mossie in Plan Ian, as if for the 1st time

Massive twin nacelles, well forward, huge centre chord, with a relalitively small tail

But a long thin elevator, right smack dab in the middle of the propwash from the twin power.

Just instinct suggests that elevator authority will alter with prop speed

Edited By Denis Watkins on 20/05/2018 10:18:40

Denis Watkins20/05/2018 10:17:34
3133 forum posts
144 photos

mosquito_pr34_3v.jpg

Jon - Laser Engines20/05/2018 10:21:41
4110 forum posts
155 photos
Posted by Ian Moody on 20/05/2018 10:06:06:

I have been flying warbirds (twins and singles) for the last 35 years

ahh fair enough. didn't mean to tell you how to suck eggs.

I have not been able to fly one of these yet, I might see if I can wrestle the controls off the chap at my club when he finally gets his in the air

Danny Fenton20/05/2018 10:43:41
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8764 forum posts
3624 photos
Ian pop over to RCGroups there is a thread over there that may be of interest?
Not many of us have flown these. I heard Andy Johnson has been wrestling with one too....
Cheers
Danny
Ian Moody20/05/2018 16:06:51
58 forum posts
10 photos

Jon, No worries mate just sort of pointing out that I am not new to flying warbird twins etc that was all.

Denis, Two other members of my club have different Mossies and they don't have differences in their elevator authority at different speeds.

One of my mates seems to recall a full size Mosquito skewing out of the top of a loop but cannot remember where he saw it.

Danny Fenton20/05/2018 22:49:33
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8764 forum posts
3624 photos

Here is the thread on RCGroups. Ian I hope you don't mind but I quoted you on the thread. You have the most experience with this model

Mine is all ready to go, made a battery box today for the flight pack and another smaller one for the Rx Lipo.

C of G with my lighter 5S5000 pack (25C) is 130mm and with the heavier 5S5000 pack (45-90C) 128mm, weight is 7kg and 7.1kg respectively using my suitcase scales. Will dig out the calibrated ones tomorrow.

I watched Mark Travers's Black Horse Mossie and it behaved impeccably, even when abused!

Cheers

Danny

Ian Moody21/05/2018 06:42:25
58 forum posts
10 photos

Danny, No worries quoting me. I hope there is something I am not doing right that is causing my flight peculiarities.

My mate flew his mosquito yesterday which is about 72" wingspan and his own design and it flew beautifully on a 4s battery. I am very envious of the the guy on RC Groups who had a flight with no concerns. I think I will start at the beginning with balancing mine etc in case I am missing something obvious. Cheers

Danny Fenton21/05/2018 22:29:33
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8764 forum posts
3624 photos

Pleased to say mine was lovely to fly this evening. moving the c of g forward to 130mm has made the model much more predicatable. Several clicks of up, and a fistfull of right aileron. Though none evident on the ground, perhaps the flaps need centring a little better. I only tried half flap, but there was no pitch change.

Focused on flying so not much on the piccy front, but Chris did grab a couple of quick shots between warning me of all the flaming dog walkers...... Why do they have to walk right down the middle of a mown strip, they have the whole field to use!!

33207298_1864190660259313_5516022856120532992_n.jpg

33124371_1864190703592642_241210487239344128_n.jpg

Thanks again to Chris for spotting for me and calming the nerves.

Cheers

Danny

Chris Bott - Moderator21/05/2018 22:37:01
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Moderator
6400 forum posts
1315 photos
1 articles
It was a pleasure. It flew really nicely. I think you're going to enjoy this one, now.

Sorry about the snatched photos. I covered the top one in that sepia malarkey to try to disguise how soft it is.

Well done though, I think you've cracked it.
Biggles' Elder Brother - Moderator21/05/2018 22:39:21
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Moderator
15748 forum posts
1460 photos

Congratulations Danny - a well deserved sucess!

BEB

john stones 121/05/2018 23:19:40
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9986 forum posts
1472 photos

Well done Danny. yes

Ian Moody22/05/2018 07:51:17
58 forum posts
10 photos

Excellent Danny that is great news. So I just have to find out why mine is so twitchy now. Di you try a loop and a stall test?

Danny Fenton22/05/2018 10:15:13
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8764 forum posts
3624 photos

Thanks guys, but I think it's Ian's persistance that has kept me from abandoning the project.

Ian I didn't really explore the envelope, a quick 5 minute flight was all that took place. The grass on the strip was long, dog walkers were in abundance and wondering evrywhere so my head was full of thoughts of getting down in one piece. I did slow the model down a bit and it didn't bite thankfully. Rolls and loops next time out.

It flew nicely on around half to two thirds throttle, average current around 40 - 45A (for both motors) so around 400 Watts per side. Jon thats around half a horse per motor to cruise.

Cheers

Danny

Jon - Laser Engines22/05/2018 11:15:24
4110 forum posts
155 photos
Posted by Danny Fenton on 22/05/2018 10:15:13:

It flew nicely on around half to two thirds throttle, average current around 40 - 45A (for both motors) so around 400 Watts per side. Jon thats around half a horse per motor to cruise.

Cheers

Danny

Thats in line with a pair of Laser 70's turing 13x6 apc props at around 7800 rpm. Flat out there should be another 1000+ rpm in that combo so i would say about a 2/3 throttle setting will be similar with that setup.

Clearly we are ignoring all of the various efficiencies and have totally different props to hand but the numbers line up in theory. Im sure Chris will fill me in once his model is up and running. I also have 2 other customers waiting on matched pairs for the same model so clearly its proving a winner for seagull. As mentioned before, im seriously tempted myself.

Chris Walby22/05/2018 11:54:38
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672 forum posts
124 photos

Not flown the Dual Ace much, but the 12x8 (noise reducing and restricted throttle opening) seem to go okay if not a little pitchy at low speed, but no issue.

Looks like good news with the C of G at 130mm and should be spot on with the Lasers up front bearing in mind the Dual Ace came out "light! with no added lead compared with Seagull's stated recommended 2S 46's and lead to get C of G.

I am meant to be getting a few hours in before swapping the Lasers across to the mossie and of course the Dual Ace will look so sad missing a couple of 70's.....What should I do? wink

Richard Wills 224/06/2018 22:01:01
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157 forum posts
7 photos

I have had 2 successful flights today with mine today. I have rebalanced to 130mm also having silently followed the thread. I needed 34 oz lead up against F1 to get there however, and total weight is now 17' 1".

Glad I went with the Saito 82's over the OS 52's, it needs them.

Compared to the maiden it flew quite nicely, not vicious at all, it gave plenty of warning on the stall test before a spin which needed provoking this time. Elevator is still quite sensitive and there is quite a noticeable pitch change on full flap but all in all i'm happy. Landing was uneventful. It flies, and it looks and sounds amazing.

Danny Fenton24/06/2018 22:29:36
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8764 forum posts
3624 photos
Excellent Richard well done
Cheers
Danny
Richard Wills 224/06/2018 22:34:50
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157 forum posts
7 photos

cheers Danny, must admit I have spent the last few months looking at it sat in the naughty corner considering getting rid of it. Glad i didn't.

Ian Moody25/06/2018 06:59:14
58 forum posts
10 photos

Good one Richard. I have been avoiding flying mine for a while but with this decent weather we are now getting I will give it another go.

Chris Freeman 324/07/2018 06:11:23
105 forum posts
117 photos

p1010347.jpgI am starting to assemble one for a mate of mine. we will be using to ASP 52 2 strokes and I am looking forward to the build as it is far easier to do than the Brian Taylor one I built from the Traplet kit. I just hope that this one will fly as well as that one did. My BT one was electric and was very light and was electric._dsc3386.jpg

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