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Martyn's Dalotel

2018 MB effort (model no 1, there may not be a no.2)

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Martyn K03/01/2018 09:36:49
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5072 forum posts
3678 photos

I forgot to mention.

I have now got full size plane on pdf for the first Bridi/Prettner designed ToC Dalotel - that was powered by a Webra Speed 91 which looks totally lost inside that cowl. These will be available from the UKCAA web site shortly. I have also got a slightly smaller 60 sized model. This is not a mainstream plan published set but was produced by a guy called Opi Mapua - also available on PDF. This looks like a very nice build indeed and a more manageable size

For info - the Bridi/Prettner Fuselage plan is nearly 9 foot long...

Ping me if you are desperate for a copy before I manage to upload them

Martyn

Martin McIntosh03/01/2018 14:27:16
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3312 forum posts
1169 photos

What span is that one Martyn? My large Dalo is 74", or the original 60 size +10% and was designed for an OS 91FX. It would scarcely loop without diving first and got chucked up the loft until I obtained a YS 110. This transformed it. Weight is just under 5kg.

Martyn K03/01/2018 15:38:03
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5072 forum posts
3678 photos

The Bridi one is 84" wingspan with wing area of 1260 square inches according to the instructions.

I have emailed you the small version

The problem with the Bridi is the Fus PDF is almost 50MB in size and struggling to reduce it. My ancient version of Adobe Acrobat Standard crashes due to the file size

Martyn K06/01/2018 20:52:37
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5072 forum posts
3678 photos
Spent a little time having a think. Basically the Enya 60fs isnt going to fit. I am very tempted to go electric with with either 4s or 5s. Tons of space for a battery - I'll add top hatch in front of the canopy for access. Need some suggestions on motor and prop sizes though. Estimate auw about 4.5 to 5lb

Any thoughts?

Martyn
Martin McIntosh06/01/2018 21:56:28
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3312 forum posts
1169 photos

Just one. Sacrilege.

Martyn K06/01/2018 23:02:18
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5072 forum posts
3678 photos
LOL. I am inclined to agree. May see if i can squeeze a 46 2stroke in there. I'll need to hide the silencer though
Martyn K06/01/2018 23:04:09
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5072 forum posts
3678 photos
Btw. What did you think of the 1/4 scale Bridi plan Martin?
Martin McIntosh07/01/2018 09:45:12
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3312 forum posts
1169 photos

That would, I am sure, make a lovely model with a large capacity motor fitted. I noted that the tips are correct on that version. The construction looks rather complex compared with mine, which comprises of foam for the complete top deck, wings, tail, fin and rudder. Other than cutting the fus sides I do not even use a plan. Tried an all balsa 48" Dalo to see if I could save weight but only lost 2.5 oz.

I imagine that there should be a fair amount of interest in it.

Paul C.07/01/2018 10:39:46
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642 forum posts
159 photos

Hi Martyn , I am inclined to agree that ic is the way to go I have fallen out of love with electric at the moment. Nothing quite like the sound of a 4 stroke and the smell of 10%👍 I am squeezing in a ASP 51 FS in my CAP 20 L the engine is inverted so the head will stick out a little but it all helps with the cooling 😉.

Paul.

Martin McIntosh07/01/2018 14:12:52
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3312 forum posts
1169 photos

Martyn, when you say that the Enya will not fit, do you just mean that the head will stick out? with YS`s I angle the motor downwards at 45 deg. My 66" version now has an inverted Laser 80 with no sticky-out silencer. I do, however, make glass cowls for them which gives loads more space.

Martyn K08/01/2018 09:20:54
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5072 forum posts
3678 photos

Morning all

Back to the engine.

My preferred option was to have been this Enya 60 FS.

enya1.jpg

I am not too worried about the cylinder head sticking down below the cowl (although there is a lot sticking below the cowl.. ) . The real attraction is that the slim silencer is also tucked underneath as well. However, it is a bit of a lump - 620g with Silencer

I will need to make a new slightly larger Firewall and move ot back a bit. Not a huge task

The recommended engine is a 32-46. I want the performance so would opt for a SC46

sc46.jpg

This fits perfectly (as expected). However getting the silencer to fit may be a bit troublesome. I am trying to keep the profile as clean as possible - weight 443g. significantly lighter

At the moment I am edging towards the SC46 but I am going to investigate other FS options.

Back to the construction.

After a couple of evening I am up to here. Fuselage in the jig. Strictly no bananas. The only change I have made is to make the fuselage sides from 3mm balsa (rather than 2.5mm) as I had better - more suitable straight grained wood. Each former also has a 3mm square cross piece glued along the baseline to help keep then stiff while under compression.

fus1.jpg

More to come..

Martyn

Bob Cotsford08/01/2018 10:41:46
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8382 forum posts
463 photos

Martyn, it's a pity you don't have an ASP or SC 61FS as they're only 445gm according to JE.

Martyn K08/01/2018 10:50:58
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5072 forum posts
3678 photos

I had spotted that on the JE site when I was checking dimensions. I missed a S/H ASP52FS on ebay last night. That would fit much more easily and is actually lighter than the 46. I am thinking of buying a new one - probably from JE if I cant find a s/h one. Funds are a bit tight at the moment as I am just about to tile and fit out the bathroom.

The 46 is slightly heavier I think, 470g including silencer

Paul C.08/01/2018 11:05:28
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642 forum posts
159 photos

If you are looking for an ASP 52 or 61 FS check out hobbyking I have the 91, 61 and 52 from them, usually in UK stock and delivered next day. Quite a bit lower in price as well, would recommend you go for the 61 as it is just a bored out 52. I have the 61 in my Ballerina plenty of power, the 52 is going in the CAP I think I will only need to extend the cowl by 1/4 of an inch to get it in.

Paul.

Martyn K08/01/2018 11:09:00
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5072 forum posts
3678 photos

Thanks Paul

Yes - that is somewhat cheaper.. Thanks for the heads up..

Martyn

Martin McIntosh08/01/2018 11:19:26
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3312 forum posts
1169 photos

Martyn, if it is of any help I have two OS 52FS which have been sitting around doing nothing for years. 445gm, 105mm to prop driver. JE do some exhaust bits to move the silencer closer I believe. Let me know if you want me to send you one for evaluation.

Levanter08/01/2018 11:41:24
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882 forum posts
437 photos

Martin
​Have you thought about an RCV 58CD. I have no personal experience of these engines but I do have two waiting to go in a twin one day.
Levanter

Martyn K08/01/2018 12:59:44
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5072 forum posts
3678 photos

Thanks both.

Martin - I have PM'd you.

Levanter, that is another option I hadn't considered. I'll see what becomes of the conventional FS path first

Martyn K17/01/2018 17:38:55
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5072 forum posts
3678 photos

Thanks to Martin I now have a very nice OS52FS as a power plant and I think you will agree it looks a much better fit:

os52fs.jpg

With that sorted I could get back onto the Fuselage. A couple of tweaks required to the design. The F1 needed to go back about 15mm and the fuel tank lowered to suit the inverted engine,

fus5.jpg

and also showing the Former drilled for the mount and M4 captive nuts fitted to F1

fus4.jpg

A bit tricky enlarging that fuel tank hole with it built into the fuselage. I used a circular saw attachment on the dremel but those things are potentially lethal..

fus2.jpg

Rear stringers added

fus3.jpg

Quite pleased with that

fus6.jpg

With the tank in place and front former done, I could add the upper front decking. One error I spotted afterwards is that the shape around the cockpit it incorrect. I'll need to fix that.

Tailplane and fin next

More to come

Martyn

McG 696917/01/2018 18:17:05
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3152 forum posts
1194 photos

Very nice progress, Martyn. yes

I wish I could say the same regarding my Vicomte build in La Grotte. Unfortunately I'm in 'illness prison' at home.

Please don't forget the Indoor Nats... wink

Cheers

Chris

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