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 Type 4 VW on a Grob 109B (Certified) 
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Joined: Fri Feb 08, 2013 6:31 am
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To test the attachment and embedding of pictures functionality of the forum, I thought I’d post some pictures of my friend’s Grob 109B Type IV engine:

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Grob engine (top) 221112.jpg
Grob engine (top) 221112.jpg [ 169.82 KiB | Viewed 3542 times ]

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Grob engine (bottom) 221112.jpg
Grob engine (bottom) 221112.jpg [ 211.25 KiB | Viewed 3542 times ]

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Grob engine (rear) 221112.jpg
Grob engine (rear) 221112.jpg [ 213.31 KiB | Viewed 3542 times ]


This is a very impressive engine in my view. 95hp @ 3400 direct drive with in-flight adjustable propeller system.
2500cc, weighing just under 100kg.
Grob has done a very nice job building this engine and getting it certified.

Any Type 4 builders out there?

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Michael
Sonex #145 from scratch (mostly)
Dual stick, Tail dragger, VW engine
http://www.mykitlog.com/rizzz


Mon Feb 11, 2013 11:48 pm
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Joined: Thu Mar 21, 2013 2:48 am
Posts: 9
Location: Winnipeg,MB Canada
Hi
Yes I'm building a Type 4 engine, 2100cc with a belted redrive on flywheel end! The redrive has a 1.79 drive ration! The engine is designed to have a power range 0f 1500 to 4900RPM... :!:
Ron


Thu Mar 21, 2013 3:27 am
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Welcome Ron,
Happy to see our first type 4 builder here.
I'm very interested in the T4, I think it is a great platform for an aero conversion, only thing is that they are probably a bit heavy for the type of aircraft I'm building currently (Sonex)

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Michael
Sonex #145 from scratch (mostly)
Dual stick, Tail dragger, VW engine
http://www.mykitlog.com/rizzz


Thu Mar 21, 2013 5:21 am
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Location: Winnipeg,MB Canada
rizzz wrote:
Welcome Ron,
Happy to see our first type 4 builder here.
I'm very interested in the T4, I think it is a great platform for an aero conversion, only thing is that they are probably a bit heavy for the type of aircraft I'm building currently (Sonex)


Heavy as compared to what? I'm building a super modified 701! My wing is from the 750 design, Ive redesigned the H.Stab to a streamlined stab/elev, added a beanie mod, removed the slats, added 2.5' to wing and added VG's and some minor changes!

The Type 4 has been used in the Sonex before! Problem is not the engine... it's the installation, must use a force one crank from Great Plains or run the prop off of the Flywheel end(right end)! The pulley end is a bad end trying to install a prop there!

I'm running a belted redrive off of the flywheel end so the engine must be designed just right!
Ron

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R.D.(Ron)  Leclerc
Winnipeg, MB Canada
49-56-27N  097-06-44W  Elev 729'
Plans Builder CH701 STOL
VW Type 4  Power,  Redrive
http://www.ronleclerc.net
http://www.flyingonfloats.com


Sun Mar 24, 2013 9:51 pm
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relentless12 wrote:
Heavy as compared to what? I'm building a super modified 701! My wing is from the 750 design, Ive redesigned the H.Stab to a streamlined stab/elev, added a beanie mod, removed the slats, added 2.5' to wing and added VG's and some minor changes!

You are right, heavy is a relative term, however you would expect the average T4 conversion to be heavier than the average T1.

relentless12 wrote:
The Type 4 has been used in the Sonex before! Problem is not the engine... it's the installation, must use a force one crank from Great Plains or run the prop off of the Flywheel end(right end)! The pulley end is a bad end trying to install a prop there!

I'm running a belted redrive off of the flywheel end so the engine must be designed just right!
Ron

Yes, that was another issue that was pointed out to me but as you say GP seems to have a solution for that, so does Grob it would seem.

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Michael
Sonex #145 from scratch (mostly)
Dual stick, Tail dragger, VW engine
http://www.mykitlog.com/rizzz


Mon Mar 25, 2013 5:18 am
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Location: Winnipeg,MB Canada
G'Day Michael...

I'm a bit behind here... busy on the Viking site!

To compare the Type 4 to a Type 1 is kind of like comparing apples to oranges! Biggest difference is the case... the Type 4 case is all aluminum and the Type 1 is 80% magnesium/aluminum alloy. To use a Type 1 engine for an aircraft(smart thing to do) you must use an aluminum case which is 14lb heavier... as the Mag/alum case will crack(it's not if if will crack it's when)! The 14lb is a bit of a penalty,,, but if you use Nikasil jugs(save 12lb) it is not so bad, then you can have a good engine... and with the HVX mods(ala Bob hoover) you can have a very reliable engine!

I prefer the Type 4 engine as it's a pretty solid base for an aircraft engine if done right... all the HVX mods were fixed up with this engine! All engines can have significant problems so if you understand what they are then you can feel secure in there use!

Ron


Thu Apr 04, 2013 7:37 pm
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14lbs, is that all?
I was told it was much more than that.

I really like the T4 and I agree they look like a much more solid platform for an aero conversion (probably why Grob chose a T4 and not a T1), I almost went down the path of converting my own T4, nearly bought a case and everything, just too many people recommended against the idea.
Weight, prop hub issues, availability of parts (especially here in Aus), were the main concerns I got confronted with (all of which have been addressed BTW).
Maybe I should have investigated further, I don't know, but then came the opportunity to buy the T1 conversion you can see in the other thread (My VW engine) on this forum.
I'm happy with my choice now, my T1 is also not your stock standard conversion which I never wanted but might still be a bit less of a challenge to complete for a first time builder like me.

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Michael
Sonex #145 from scratch (mostly)
Dual stick, Tail dragger, VW engine
http://www.mykitlog.com/rizzz


Thu Apr 04, 2013 10:28 pm
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Location: Winnipeg,MB Canada
Hey Michael
Here is a Type 4 in your neck of the woods!
http://www.vw-engines.com/index.htm
Here is a video of this engine... just love the sound!
http://www.youtube.com/watch?v=g4GvOtao ... er&list=UL

I have been playing around getting my Type 4 together for the last 4 years... actually bought piece by piece! It's been a lot of fun... there is nothing that I do not know about this engine! I have even designed and built my own redrive!
Ron


Thu Apr 04, 2013 11:19 pm
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